1718 Ex I/O - RockwellAutomation.com · 4 Rockwell Automation Publication 1718-IN001A-EN-E - June...

Installation Instructions

Original Instructions

1718 Ex I/OCatalog Numbers: 1718-AENTR, 1718-IJ, 1718-OB2, 1718-OB2L, 1718-IBN8, 1718-IBN8B, 1718-IT4B, 1718-IR4B, 1718-IF4HB, 1718-CF4H, 1718-PSDC, 1718-A20, 1718-A10, 1718-CBL3, 1718-ARM

Topic Page

Important User Information 2

European Hazardous Location Approval 4

IEC Hazardous Location Approval 6

Enclosures 8

Chassis 9

Mount the Chassis 9

Insert and Remove Modules 15

Wire the Chassis Ex e Terminals 11

Output Deactivation Feature 12

Insert and Remove Modules 15

Field Wiring 19

Install Field Wiring for Intrinsically Safe Circuits 22

Line Fault Detection 24

EtherNet/IP Connection 26

System Expansion 31

1718 Ex I/O

Important User Information

Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid-state Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online athttp://www.rockwellautomation.com/literature/) describes some important differences between solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid-state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation®, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements that are associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation®, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard and recognize the consequences.

SHOCK HAZARD: Labels may be on or inside the equipment (for example, drive or motor) to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment (for example, drive or motor) to alert people that surfaces may reach dangerous temperatures.

IMPORTANT Identifies information that is critical for successful application and understanding of the product.

2 Rockwell Automation Publication 1718-IN001A-EN-E - June 2020

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1718 Ex I/O

Enclosure ConsiderationsThe 1718 Ex I/O distributed I/O is specially designed for operation within an enclosure or within a monitored environment. Observe the requirements for enclosures and the installation conditions set out in the chapter on safety of the 1718 Ex I/O User Manual, publication number 1718-UM001.

Prevent Electrostatic Discharge

WARNING: Risk of explosion.

Electrostatic charging of plastic components can lead to discharge, which can cause explosive mixtures to ignite.• Avoid electrostatic charges. For example, plastic parts must always be cleaned

using a damp cloth, and never using a dry cloth.• Affix a warning sign that is easily recognizable to the inside of the enclosure. The

sign must read as follows: "WARNING — avoid electrostatic charge".

ATTENTION: This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:• Touch a grounded object to discharge potential static.• Wear an approved grounding wriststrap.• Do not touch connectors or pins on component boards.• Do not touch circuit components inside the equipment.• Use a static-safe workstation, if available.• Store the equipment in appropriate static-safe packaging when not in use.

At the end of its life, this equipment should be collected separately from any unsorted municipal waste.

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1718 Ex I/O

European Hazardous Location Approval

The following applies to products marked II 2(1)G. Such modules:

• Are Equipment Group II, Equipment Category 2, and comply with the Essential Health and Safety Requirements relating to the design and construction of such equipment given in Annex II to Directive 2014/34/EU. For details, see the EU Declaration of Conformity from the 1718 Certification Bulletin, publication 1718-CT001.

• Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air are likely to occur in normal operation occasionally (see Zone 1 definition). Such locations correspond to Zone 1 classification according to ATEX directive 2014/34/EU.

• The I/O modules have outputs leading into Category 1 [Zone 0 (gas) or Zone 20 (dust)] or Category M1 (mining)].

1718-CF4H• Field connections and mounting: the type of protection is "II 2(1) G Ex db eb q [ia Ga] IIC Gb" and

"II (1) D [Ex ia Da] IIIC", comply to Standards EN 60079-0:2012/A11:2013, EN 60079-1:2014, EN 60079-5:2015, EN 60079-7:2015 and EN 60079-11:2012. Certificate Presafe 19 ATEX 14057 U.

1718- IF4HB• Field connections and mounting: the type of protection is "II 2(1) G Ex db eb q [ia Ga] IIC Gb" and


1718-IR4B, 1718-IT4B, 1718-IBN8B, 1718-IJ• Field connections and mounting: the type of protection is "II 2(1) G Ex db eb q [ia Ga] IIC Gb" and


1718-IBN8• Field connections and mounting: the type of protection is "II 2(1) G Ex db eb q [ia Ga] IIC Gb" and


1718-OB2, 1718-OB2L• Field connections and mounting: the type of protection is "II 2(1) G Ex db eb q [ia Ga] IIC Gb" and



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1718 Ex I/O

The following applies to products marked II 2G. Such modules:

Are Equipment Group II, Equipment Category 2, and comply with the Essential Health and Safety Requirements relating to the design and construction of such equipment given in Annex II to Directive 2014/34/EU. For details, see the EU Declaration of Conformity from the 1718 Certification Bulletin, publication 1718-CT001.

Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air are likely to occur in normal operation occasionally. Such locations correspond to Zone 1 classification according to ATEX directive 2014/34/EU.

1718-AENTR• Mounting: the type of protection is " II 2 G Ex db eb ib q IIC Gb", comply to Standards EN 60079-

0:2018 EN 60079-1:2014 EN 60079-5:2015 EN 60079-7:2015 EN 60079-11:2012+ A11:2013 Certificate PTB 19 ATEX 2007 U.

1718-PSDC• Mounting: the type of protection is " II 2 G Ex db eb q IIC Gb", comply to Standards EN 60079-

0:2012/A11:2013, EN 60079-1:2014, EN 60079-5:2015 and EN 60079-7:2015 Certificate Presafe 19 ATEX 14059U.

1718-A10, 1718-A20• Mounting: the type of protection is " II 2 G Ex db eb mb IIC T4", comply to Standards EN 60079-

0:2009, EN 60079-1:2007, EN 60079-7:2007, EN 60079-18:2009 Certificate Presafe BVS 11 ATEX E 041 X.


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1718 Ex I/O

IEC Hazardous Location Approval

The following applies to products with IECEx certification. Such modules:• Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or

air are likely to occur in normal operation occasionally (see Zone 1 definition). Such locations correspond to Zone 1 classification to IEC 60079-10-1.

• Are intended to be mounted in areas requiring equipment protection level Gb (Zone 1) on approved 1718 chassis.

• Provides intrinsically safe circuits, type of protection: [Ex ia], up to areas requiring equipment protection level Ga (Zone 0), equipment protection level Da (Zone 20) and Mining (M1).

1718-CF4H• Field connections and mounting: the type of protection is "Ex db eb q [ia Ga] IIC Gb" and "[Ex ia

Da] IIIC", comply to Standards IEC 60079-0:2011 IEC 60079-1:2014 IEC 60079-5:2015 IEC 60079-7:2015 IEC 60079-11:2011 Certificate IECEx PRE 19.0012U.

1718- IF4HB• Field connections and mounting: the type of protection is "Ex db eb q [ia Ga] IIC Gb" and "[Ex ia


1718-IR4B, 1718-IT4B, 1718-IBN8B, 1718-IJ• Field connections and mounting: the type of protection is "Ex db eb q [ia Ga] IIC Gb" and "[Ex ia


1718-IBN8• Field connections and mounting: the type of protection is "Ex db eb q [ia Ga] IIC Gb" and "[Ex ia

Da] IIIC", comply to Standards IEC 60079-0:2011 IEC 60079-1:2014 IEC 60079-5:2015 IEC 60079-7:2015 IEC 60079-11:2011 Certificate IECEx EXA 17.0015U.

1718-OB2, 1718-OB2L• Field connections and mounting: the type of protection is "Ex db eb q [ia Ga] IIC Gb" and "[Ex ia



1718 Ex I/O

The following applies to products with IECEx certification. Such modules:• Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or

air are likely to occur in normal operation occasionally (see Zone 1 definition). Such locations correspond to Zone 1 classification to IEC 60079-10-1.

1718-AENTR• Mounting: the type of protection is " Ex db eb ib q IIC Gb", comply to Standards IEC 60079-0:2017

IEC 60079-1:2014-06 IEC 60079-5:2015 IEC 60079-7:2015 IEC 60079-11:2011 Certificate IECEx PTB 19.0025U.

1718-PSDC• Mounting: the type of protection is " Ex db eb ib q IIC Gb", comply to Standards IEC 60079-0:2017

IEC 60079-1:2014-06 IEC 60079-5:2015 IEC 60079-7:2015 IEC 60079-11:2011 Certificate IECEx PRE 19.0014U.

1718-A10, 1718-A20• Mounting: the type of protection is " Ex db eb mb IIC T4 Gb", comply to Standards IEC 60079-

0:2011, IEC 60079-1:2014, IEC 60079-7:2017, IEC 60079-18:2017 Certificate IECEx BVS 11.0019X.

ATTENTION: This equipment is not resistant to sunlight or other sources of UV radiation.

WARNING: • This equipment shall be mounted in an ATEX/IECEx Zone 1 certified enclosure with

a minimum ingress protection rating of at least IP54 (as defined in EN/IEC 60529) and used in an environment of not more than Pollution Degree 2 (as defined in EN/IEC 60664-1) when applied in hazardous (Ex) environments. The enclosure must be accessible only by the use of a tool.

• Provision shall be made to prevent the rated voltage from being exceeded by transient disturbances of more than 140% of the rated voltage.

• Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

• Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.


1718 Ex I/O

EnclosuresRockwell Automation partners with Pepperl + Fuchs for enclosure solutions. For more details on the enclosures from our partners, see publication 1718-PP002.

Plastic enclosureThe plastic enclosure mounts on through holes that are exposed when you remove the lid.

Stainless steel enclosureThe stainless steel enclosure installs using an external mounting bracket attached to the enclosure.

WARNING: Errors during installation can cause life-threatening injuries and significant property damage.• Ensure the installation is performed only by sufficiently trained and qualified

personnel. Trained and qualified personnel have relevant experience in this area. They know and understand the rules and standards for the components and systems.

• Before you begin the installation process, make sure that the atmosphere is not potentially explosive.

• Ensure that the plant is de-energized.

WARNING: Incorrect assembly poses an explosion hazard.

Operating the components of the 1718 Ex I/O without a certified enclosure can cause sparks. This may ignite the surrounding potentially explosive atmosphere.

Install and operate components of the 1718 Ex I/O in zone 1 if they are installed in a certified enclosure that meets equipment protection level Gb.

For more information on Zone 1 enclosure requirements, see 1718 Ex I/O User Manual, publication 1718-UM001.

IMPORTANT The components of the 1718 Ex I/O, together with the enclosure, must be certified by a recognized certification authority before commissioning.


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1718 Ex I/O

Chassis

Mount the ChassisScrews on the chassis

1718-A10, 1718-A20 Chassis Connections

Wire the power supply and the network cables using the 1718-CBL3 cable. The 1718-CBL3 cable connects the base and extension chassis. The chassis Ex e

WARNING: Explosion hazard due to thermal ignition and violation of protection type.

Make sure that the maximum ambient temperature for the components used is not exceeded. Details of ambient temperature is provided in the Technical Data, 1718-TD001. Note that the temperature rises with an increasing number of active modules in the enclosure. If necessary, take measures to reduce the temperature.

WARNING: Explosion hazard due to unapproved accessories.

Accessories that do not meet the requirements for use in hazardous areas can cause explosive mixtures to ignite.

Use only accessories and devices that are approved for use in the respective environment.


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1718 Ex I/O

terminals are shielded with a clear cover to protect the wiring and must be mounted before the system is commissioned. Observe respective approvals for explosion protection.

For more information on selecting the appropriate chassis, see the Chassis section in the 1718 Ex I/O User Manual, publication 1718-UM001.

Chassis Ex e Terminals

Clear protective cover



1718 Ex I/O

Wire the Chassis Ex e TerminalsEx e Terminal Wire Assignment

Ex e Terminal Assignment – Chassis Connection with 1718-CBL3 cable

Base Chassis Terminal Base Chassis 1718-CBL3 Wire Color Extension Chassis Terminal

37 Blue 37

36 Red 36

35 Black 35

34 Violet 34

31 Pink 33

30 Red/blue 23

29 Yellow 29

28 Green 28

27 Brown 27

26 White 26

21 Brown/green 25

20 Yellow/brown 32

16 Gray 16

14 13 12 11 10 9 8 7 5 4 2 1

40 39 87 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 173738

Chassis

Power supply 2Deactivation terminals(shown sideways)

Power supply 1


1718 Ex I/O

Output Deactivation Feature

A section of the Ex e terminals controls the output deactivation of the I/O modules.

The output deactivation of the I/O modules only works for I/O modules that are equipped with a deactivation feature (1718-OB2, 1718-OB2L). I/O modules with and without a deactivation feature can be installed on the same chassis; however, only the I/O modules that are equipped with a deactivation feature are controlled by the output deactivation.

If I/O modules equipped with a deactivation feature are installed on the chassis, these modules can be deactivated using an external switch.

The safe state is defined as de-energized field circuit.

• To use the output shutdown of I/O modules in slots 1 to 10, replace plug-in jumper 18 and 19 with an external voltage-free contact.

WARNING: Explosion hazard due to the use of non-suitable devices.

Devices that do not meet the requirements for use in explosion-hazardous areas can cause explosive mixtures to ignite.

Only use volt-free contacts approved for use in the respective environment. For installation in Zone 1, for example, use a volt-free contact designed with Ex e protection. The shutdown input is a circuit supplied by the chassis with Safety Extra-Low protective Voltage (SELV), and must therefore also be isolated from other circuits.


1718 Ex I/O

• To use the output shutdown of I/O modules in slots 11 to 20 (not applicable for 1718-A10), replace plug-in jumper 17 and 18 with an external voltage-free contact.

Power Connection (24V)Make sure that the cross sections of the cables are large enough to keep voltage drops on the supply lines to a minimum.

Ex e Terminal Assignment – Shutdown Jumpers

Terminal Plug-in jumpers Function

19

Output deactivation of I/O modules

Slots 1…10

18

17 Slots 11…20

IMPORTANT • The power supplies must be supplied with SELV/PELV power that meets the ranges specified in the Technical Data publication,1718-TD001.

• 1718-PSDC: The supplied DC voltage Un = 24V (18…32V) must be of type SELV/PELV and not exceed a Umax (common mode) of 60V.

Ex e Terminal Assignment – Power and Ground Connection

Terminal Number Icon Terminal Description Function

16 PB Equipotential Bonding of the hazardous area15 PB

6 PE

Power supply 15 L+

4 N-

3 PE

Power supply 22 L+

1 N-


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1718 Ex I/O

Maximum Number of I/O Modules

The power consumption of the I/O modules, adapter, and power supplies can be found in the Technical Data publication, 1718-TD001. For some devices, the technical data provides power dissipation information in addition to the power consumption. This specifies the power that is converted into heat in the device and is important for the calculation of heat in the enclosure. If the power dissipation is not specified in the technical data, the power dissipation is calculated using the value of the power consumption.

WARNING: Explosion hazard through power overload

Excessively high power can cause the maximum permissible temperature within the enclosure and the maximum permissible surface temperature of the enclosure to be exceeded.

Perform a heat calculation to determine the maximum number of I/O modules. Do not install additional loads if the maximum permissible number of I/O modules is installed in the enclosure.

IMPORTANT The maximum number of I/O modules that can be installed, taking into account the temperature class, is determined by the permissible power dissipation in the enclosure. If, in addition to the 1718 Ex I/O, other loads are installed, their power consumption may reduce the power available to the 1718 Ex I/O. Use only the approved configuration for the enclosure selected.



1718 Ex I/O

Insert and Remove ModulesThe connector pins on the modules and the female connectors on the chassis form a flameproof enclosure when plugged together.

Flameproof Connector Pin Enclosure

Bent Connector Pins

WARNING: Explosion hazard from damaged connector pins

Bent or damaged pins on modules can generate a spark, which can cause explosive mixtures to ignite.• Never use modules with bent or damaged connector pins.• If the connector pins are bent or damaged, replace the module with an intact

original module.• You are not permitted to repair modules with bent connector pins yourself.


1718 Ex I/O

Damaged Pins with Nicks or Scratches

Fixed slots are reserved on the chassis for adapters and power supplies. Adapters are equipped with mechanical coding on the underside of the housing to prevent these modules from being accidentally plugged into the slot of an I/O module.

I/O modules do not have any slot assignment. You can mount I/O modules in any available slot. Arrange modules in the slots on the chassis from left to right.

Unused slots can be left empty or fitted with the 1718-ARM placeholder module.

IMPORTANT Always maintain a clearance of 50 mm (1.97 in.) between intrinsically safe and non-intrinsically safe circuits.

TIP Write down the module types used or other identification codes using label strips. You can stick the labels between the female connectors of the chassis. The label strips should be no thicker than normal paper so that the I/O modules engage properly at all times.


1718 Ex I/O

Modules connect to the chassis using a two-step safety system. The module has a built-in removal latch and sheath section that ensures each module is fully engaged when it is inserted in the chassis slot. The two-step system also ensures that any potential ignition spark is contained before you disengage the module.

Insert Modules1. Align the connecting guides on the module to the two sets of latch

hooks of an available slot on the chassis.

2. Push the module gently into the slot until you hear two clicks.

Disengaged

Engaged

Module

Module Chassis

Chassis

Chassis connector pins

Chassis slot latch hooksSheath

Removal latch

Chassis slot latch hooks

SheathRemoval latch


1718 Ex I/O

Remove Modules

I/O modules with intrinsically safe front connectors or modules without front connectors (for example, power supply) can be removed while operation is ongoing.

1. Disconnect the cables from the front socket on the module.

2. Hold both the top and bottom removal latches, and then slide the latches towards the chassis until the chassis slot latch hooks disengage from the module with a click.

3. While still holding the removal latches, pull the module away from the chassis. The removal latch and sheath section lifts away from the chassis connector pins.

WARNING: • Forcibly removing modules or using unsuitable tools can damage the module or

the chassis, meaning that explosion protection can no longer be guaranteed. Only remove modules using the built-in removal device. The built-in removal device forces a two-stage removal process that contains any potential ignition spark within the pressure-resistant terminal area.


1718 Ex I/O

4. Release the removal latches.

5. Grip the module on the top and bottom, where the removal latches are, and then pull the module away from the chassis.

If necessary, adjust the information on the label strips of the chassis.

Field Wiring

I/O modules are wired differently depending on the type.

Overview of connections

Designation Description

Modules with intrinsically safe circuits and front sockets

Field connections can be made to the I/O modules using screw terminals, front screw terminals, or spring terminals.


1718 Ex I/O

Requirements for wires, stranded conductors, and wire end ferrules.

IMPORTANT Use the terminal blocks from the range of accessories. For more information, see Accessories in Chapter 1 of the 1718 Ex I/O User Manual, publication 1718-UM001.

WARNING: A spark can be generated by bare, conductive parts such as loose wire ends, which can cause explosive mixtures to ignite.• Stranded conductors must always be used with wire end ferrules. We recommend

using wire end ferrules approved according to DIN 46228-4.

Wires

Description Value

Insulation stripping 9 mm (0.35 in.)

Core cross-section (conductor): 0.14…0.5 mm2 (26…20 AWG) for 1718-IBN80.08…1.5 mm2 (28…16 AWG) for all other modules

External diameter (conductor + insulation) 2…3 mm (0.078…0.118 in.)

Stranded conductors

Description Value

Insulation stripping 9 mm (0.35 in.)

Core cross-section for wire end ferrules with plastic sleeve 0.5 mm2 according to IEC 60228 Class 5 and 6

Core cross-section for wire end ferrules without plastic sleeve 0.5…1.5 mm2 according to IEC 60228 Class 5 and 6



1718 Ex I/O

Field connections can be made to the I/O modules using screw terminals or spring terminals. Use the terminal blocks from the range of accessories. For more information, see Accessories in Chapter 1 of the 1718 Ex I/O User Manual, publication 1718-UM001.

Front screw terminals or spring terminals are ideal for future expansion or for replacement of individual field connections, since the terminal can remain in the front socket of the I/O module during wiring.

WARNING: Ensure that measuring devices also satisfy the requirements of their respective installation and ignition protection type.

Only use accessories and devices that are approved for use in the respective environment.

ATTENTION: Circuits with the Ex i type of protection that have been operated with non-intrinsically safe circuits must no longer be used as circuits with Ex i type of protection.

Use only Ex i-certified measuring instruments in conjunction with Ex i-certified I/O modules.



1718 Ex I/O

Install Field Wiring for Intrinsically Safe Circuits

1. The I/O modules are wired differently depending on the type. Wire the terminal blocks to the field devices in accordance with the information in the Technical Data publication, 1718-TD001, for the I/O modules used.

2. Note the permissible core cross section of the conductor. We recommend that you do not exceed a conductor cross section of:0.5 mm2 (20 AWG) for 1718-IBN80.75 mm2 (18 AWG) for all other modules.

Connection Data for Terminal Blocks

Wiring Type

1719-TB6, 1719-TB6S, 1719-TB8, 1719-TB8S, 1719-TB8Sx2, 1719-TB8x2, 1719-TB6F, 1719-TB8F, 1719-TB8x2F

1719-TB8x2SA

Rigid conductor cross-section

0.14 mm2…1.5 mm2 (26…16 AWG) 0.14 mm2…0.5 mm2 (26…20 AWG)Flexible conductor cross-section

Flexible conductor cross-section with wire end ferrule with no plastic sleeve

0.25 mm2…1.5 mm2 (24…16 AWG) 0.25 mm2…0.5 mm2 (24…20 AWG)

Flexible conductor cross-section with wire end ferrule with plastic sleeve

0.25 mm2…0.5 mm2 (24…20 AWG) Not applicable

WARNING: Improperly wired front connections can lead to dangerous confusions of intrinsically safe and non-intrinsically safe circuits, causing explosive mixtures to ignite.

Always make sure that the front connectors are correctly wired.



1718 Ex I/O

3. If you are using stranded conductors, crimp the stranded conductors with wire end ferrules.

4. Make sure that the insulation on the conductors extends all the way to the terminal.

5. Make sure that the separation distances to non-intrinsically safe circuits are observed.

6. Unused cables and connection lines must be connected to terminals, securely fixed and isolated, or grounded.

7. If necessary, you can code the front sockets of the I/O modules and terminals so that the terminals and the associated field devices can be assigned to exactly one front socket.

8. Plug the terminals into the front sockets of the corresponding I/O modules and screw the terminals into place using the side screws.

9. Label the connection lines.

Coding

You can code the front sockets(1) and the terminals of the I/O modules so that the terminals and the connected field devices can be assigned to exactly one front socket.

Use coding pins 1719-CP.

Coding Connections

1. To code the front socket of an I/O module, insert one or more coding pins into the corresponding grooves on the front socket.

(1) Not applicable for 1718-IBN8 Ex I/O 8 Point Digital Input module.

WARNING: If the coding is not unique, terminals can be accidentally mixed up.

Establish a clear coding so that every terminal fits exactly one front socket.


1718 Ex I/O

2. In order to code the terminal to match the front socket, cut off the plastic lugs from the terminal from those points where coding pins are located in the front socket.

Note that the coding in example 1 and example 2 is not unique. The terminal from example 1 could be accidentally connected to the front socket in example 2. In contrast, the coding in example 1 and example 3 is unique.

Line Fault DetectionMost I/O modules have a line fault detection function that can recognize a lead breakage or a short circuit.

• 1719-IBN8B or 1719-IBN8 digital input module If the input is used, for example, with a mechanical contact, an additional resistor circuit must be installed to ensure that the line fault detection function can work correctly. Using the additional resistor circuit, the electronics can distinguish between a closed switch and a short circuit.

• 1719-IJ frequency counter module If the input is used for direction detection, the input must be connected to a resistor circuit. The rotation direction input is ignored for devices without rotation direction detection.

Coding Examples

Example 1 Example 2 Example 3

Terminal

Front socket

2.2 KΩ10 KΩ


1718 Ex I/O

The line fault detection function of the analog I/O modules is based on a current measurement. An additional resistor circuit is not required.

Line fault detection can be enabled or disabled by checking or clearing the Enable Diagnostics checkbox in the Add-on Profile respectively. Status will only be shown on the module LED.

For more information, refer to the Add-on Profile help topic for the module.

Cold Junctions in ThermocouplesThe 1718-IT4B I/O modules are equipped with an internal cold junction.

Line Resistance in Resistance ThermometersIf you operate I/O module 1718-IR4B in a 2-wire configuration, the line resistance amounts to that of a resistor connected in series to the sensor and affects the measurement result. In order to avoid measurement errors, the line resistance must be measured and compensated for in this configuration. Two options are available here:

Short circuit the Pt100

1. Short circuit the Pt100 sensor.

2. In the configuration software, set the measuring input of the I/O module to resistance measurement.

For more information, refer to the software manual for the adapter used.

3. Call up the measured value display for the I/O module and make a note of the measured value.

4. In the configuration software, set the measuring input of the I/O module to 2-wire measurement with Pt100 sensor.

5. Enter the measured resistance in the Line resistance field. The maximum permissible line resistance is 50 Ω.


1718 Ex I/O

Use a Calibrating Resistor

1. Use a calibrating terminal with an integrated calibrating resistor in the sensor supply line.

2. In the configuration software, set the measuring input of the I/O module to 2-wire measurement with Pt100 sensor.

For more information, refer to the software manual for the adapter used.

3. In the configuration software, set the line resistance to 20 Ω.

4. Replace the Pt100 sensor at the measuring point with a 100-Ω measurement resistor.

5. To measure the resistance, call up the measured value display for the corresponding measuring point.

6. Set the displayed value to 0 °C using the calibration potentiometer.

7. Then reconnect the Pt100 sensor.

EtherNet/IP ConnectionThe adapter is connected to the Ethernet network using the two Ethernet interfaces on the front. Mechanically, this occurs through an M12 plug connection according to IEC 61076-2-101:2012.

Three basic connection scenarios are shown below:


1718 Ex I/O

Elementary Safety ConsiderationsSystem earth:

• The enclosure is connected to the equipotential bonding PB of the hazardous area (system earth).

Zone 1

Adapter

I/O module

Enclosure

ADPT

IOM

Cable type 1: M12 to RJ45

Cable type 2: M12 to M12

M12 connector

Feed through

RJ45 connector

Cable shielding: Connection to the equipotential bonding of the hazardousarea (system earth) PB (Protective Bonding according to IEC 61140:2016)

PB PBPB PB

PB PB

PB

ADPT IOM IOM

ADPT IOM IOM

ADPT IOM IOM

ADPT IOM IOM

ADPT IOM IOM

< 100 m

< 100 m

< 100 m

1

2

3

Non-explosion hazardous area


1718 Ex I/O

• The connection must be secured against loosening, fixed against mechanical stress and protected against corrosion. The Protective Earth (PE), which is optionally carried into the enclosure, must either be separated from the equipotential bonding of the hazardous area or the installer regulations of IEC/EN 60079-14 must be observed. The shield of the Ethernet cable must also be connected to the equipotential bonding. If the shield is grounded on both sides, the equipotential bonding of the hazardous area must be carried to the remote station in accordance with the specifications of the installer regulations of IEC/EN 60079-14. In the case of one-sided earthing, the remote station must be sufficiently insulated (>500V AC/700 V DC).

WARNING: • Use only 1718 EtherNet/IP™ cables listed within manual.• Never fabricate the M12 plug for the adapter. Always use the original plug supplied

with the cable. • For connections in explosion-hazardous areas, only the specified M12 connections

on the adapter and cable may be used.• No further allocation is permitted in explosion-hazardous areas. A cable with an

M12 plug must be connected either directly to another M12 connection in the explosion hazardous area or directly to an RJ45 port in the safe area.

• Plugging and unplugging of the cable in explosion-hazardous areas is allowed only if both sides of the connection (socket on the adapter and connector on the cable) are deenergized and the atmosphere is not potentially explosive.

• The shielding must be connected to the same “PA” at both ends of the wire (or PE in the safe area).

• Do not exceed the maximum cable length of 100 m.


1718 Ex I/O

Potential Equalization and Shielding

Sources of InterferenceElectromagnetic fields can interfere with the communication path.

Twisted-pair cables significantly reduce the influence of these interference fields, particularly when compared to cables with parallel cores. The direction of the recorded interference field in a twisted-pair cable reverses over short intervals. This means that the induced noise is practically canceled out, while in parallel cores the noise is active across the entire area.

A shielding keeps interfering noise away from the communication path.

IMPORTANT The following section cannot provide the reader with a complete picture of all requirements in terms of grounding, shielding, and lightning protection. For more information on these topics, see the technical data and the applicable standards.


1718 Ex I/O

EMC filters are used in many devices to divert any noise to ground. High-frequency noise occurring in the same way on both lines is dissipated symmetrically through the capacitor impedances and does not appear as a differential signal.

Wiring

Lay the signal lines such that they are separate from the power cables. AC voltages and current spikes can induce stray voltages in neighboring lines. Use shielded cables for EMC-tested devices.

Separate grounding bars from the shielding (see IEC/EN 60079-14). The shielding is grounded at one point (to PA in explosion-hazardous areas).

Field wiring

Depending on the application, the shielding of the wiring must be grounded at one point or at both ends. If possible, avoid grounding at both ends to prevent ground loops and ensure no current flows through the shielding in the case of a ground potential difference.

For sound results, ground one end of the cable if the cable is laid on a grounded metal cable support. To reduce interference and ensure that only small areas are

WARNING: Improperly installed wiring can cause explosive mixtures to ignite.

Observe the wiring specifications set out in IEC/EN 60079-14 for laying lines in an explosion hazardous area.


1718 Ex I/O

exposed to the filed, lay the metal frame in the immediate vicinity of the conductor.

Digital inputs are normally controlled by NAMUR proximity switches with a low-impedance signal. In this case, noise has a far lower impact than in circuits containing open switches that do not have an additional resistor circuit. For this reason, do not connect digital inputs to exposed wiring.

The analog signals of resistive sensors or thermocouples are particularly susceptible to noise. Signal converters have built-in filters to reduce this noise. The filters can be switched on if fluctuations in the measuring signal cannot be reduced sufficiently by other means. For more information, refer to the software manual for the adapter used.

Eliminate Interference

To improve power,

1. Install power filters in power lines.

Lay supply cables leading to power filters separately from other cables to avoid picking up any filtered interference.

2. Fit surge protection filters in signal lines.

3. Change to galvanically isolated circuits.

System Expansion

Add I/O modules

Transfer input or output data to a slot that was previously empty, by adding anI/O-module. To do this, you need to modify the adapter configuration.


Extend the Chassis

WARNING: Changes to the cable installation must only be carried out in the absence of a potentially explosive atmosphere or when equipment is deenergized.

WARNING: Unsealed cable entries can cause conductive parts such as loose wire ends to generate sparks that could ignite an explosive mixture.

Seal all unused openings in the enclosure prior to the start of commissioning with appropriate stopping plugs or sealing plugs in order to maintain the selected type of protection. See the relevant approvals.

Allen-Bradley, expanding human possibility, FactoryTalk, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.

EtherNet/IP is a trademark of ODVA, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

Publication 1718-IN001A-EN-E - June 2020 Copyright © 2020 Rockwell Automation, Inc. All rights reserved.

Waste Electrical and Electronic Equipment (WEEE)

Rockwell Automation maintains current product environmental information on its website at rok.auto/pec.

At the end of life, this equipment should be collected separately from any unsorted municipal waste.

Your comments help us serve your documentation needs better. If you have any suggestions on how to improve our content, complete the form at rok.auto/docfeedback.For technical support, visit rok.auto/support.

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