Modbus Enhanced

7/27/2019 Modbus Enhanced

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Siemens Building Technologies Building Automation

Modbus Enhanced

Features of the new Modbus


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Siemens Building Technologies Building Automation

Modbus Enhanced

We had to do some changes


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Siemens Building Technologies Building Automation3

Modbus Enhanced - Requirements

We want to be backward compatible

We want to add new feature to make it faster and easier to

integrate with Modbus

We want to be flexible and integrate a multitude of devices with

one driver

We want to take advantage of expanded addressing and eliminate

Meta-Points

We want to add Modbus TCP support

We want to combine Modbus Master and Slave in one driver


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Modbus Enhanced

Can run in three modes:

Legacy Mode

Meta-Drop Driver

Backwards compatible

Enhanced Master Mode ISB Files

Expanded Addressing

Slave Mode

ISB Files

Expanded Addressing

New concept not backward compatible


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Modbus Enhanced

Modbus Enhanced Mode will support:

Modbus TCP Client (Master)

ISB Files

Expanded Addressing

New way of communicating Modbus TCP Server (Slave)

ISB Files

Expanded Addressing

New way of communicating

Implementation depends on baseline support


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Modbus Enhanced - Legacy Mode

Will be backwards compatible to MBA/MBG driver

Will provide same functionality as current Modbus driver

Will be configured like current standard Modbus Master Driver

Will work under earlier (3.4) versions of Insight (Patch file required)

Will only use FLN1 for communication

Will not use Expanded Addressing Will not have fixed point maps Will not make use of ISB files Will require a minor Database change for upgrades

Meta Drop now at FLN 253 Drop 30

Diagnostic Drop now at FLN 253 Drop 31


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Modbus Enhanced Enhanced Master Mode

Will require the usage of ISB files

No ad-hoc configuration possible

Will allow to read different point types in the same register range with one poll

Will allow to integrate different devices with different needs on the same driver (e.g. Long Swap per

point not per driver)

Will require a tool to create the ISB files

Application Builder Tool (pending)

Will make use of expanded addressing

FLN 1, 2 & 3 for serial communication

FLN 6 to 100 for TCP/IP

Up to 247 Drops/Slaves per FLN

Up to 1000 points per Drop/Slave

Up to 100 different applications per driver

Up to 8000 different application points


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Will use one drop per device

drop number is device address on serial ports (default).

Address point (point 1) can be used as slave address (Alternative addressing method).

Will communicated on different FLNs

Will support up to 31 devices on each FLN direct or up to 247 devices with repeaters.

Will use drops 1 to 247 on FLN1, 2 and 3 Will provide virtual FLNs for TCP/IP operation

Will use drops 0 to 247 for TCP/IP FLNs to support sub networks on TCP/IP devices

Different FLNs can use different communication set-up

Baud rate

Parity

Will accommodate poll priority


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Modbus Enhanced Modbus Slave Mode

Exclusive Mode if serial ports are used

Uses ISB file

Uses Expanded Addressing

Can simulate multiple slaves in one driver

Will use drop number to set slave address

Will use only FLN1 for serial communication Will use virtual FLNs 6 to 100 for Modbus TCP Server (pending

baseline support)


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Modbus Enhanced ISB File Properties

Auxiliary Fields Definition

AddressOffset

1 2

Data

Type

C,

CM,

B,

I,IS,ID

,IE,

IF,

IP,

H,

HS,

HM,

HN,D,

DS,

F,P

3

BitNumber

(BitMappedonly)

4

Word

Swap

5

Long

Swap

(32Bitreg

istersonly)

6

Commandonlywith

nextregister

7

PollP

riority

0-65535 XX 0-15 Y/N Y/N Y/N 0-255


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Address Offset

(0-65,535)The address offset defines the offset from the base register for the particular

register to be accessed in the range of 0 to 65535. This is a mandatory entry. If this field

is not filled in or if a value above 65535 is entered, then the point will be declared

invalid. The base registers are:

1 for Coil Registers

10,001 for Binary Input Registers

30,001 for Analog Input Registers

40,001 for Holding Registers


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Data Types

C & CM for Coils

CM uses function 15 instead 5 fro commanding

B for Binary Inputs

I, IS, ID, IE, IF & IP for Analog Inputs

H, HS, HM, HN & P for 16 bit Holding Registers HM & HN are using function 16 instead of 6 for commanding

D, DS & F for 32 bit Holding Registers

Bit number

Used for defining the bit number for point types P and IP


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Word Swap

Selects if the bytes of a register are swapped

default is no swap

Long Swap

Selects if the two registers of a two register value (32 bit value) should be swapped.

Default is long swap

Command with next

Commands the current point only if the next point will be changed as well.

Multiple register commands are used

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Poll priority

Allows to poll less frequently for points with lower importance or which will change

seldom.

Poll priority of 0 is used for command only points, no poll will be created for such points

Poll priority of 1 will poll a point every time the device is served.

Poll priority of n (n = 2 to 255) will skip n-1 polls

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Modbus Enhanced Other Features

Build in Diagnostic / Test Mode

Will provide capability to create a manual poll and command definition

Will allow to read one variable from one device at a time

Will allow to write one variable to one device at a time

Definition can be changed on the fly

Can be used for initial start-up, e.g. to get the communication going Can be used to explore devices if special settings like Long Swap are needed

Can be used to configure a device in the field if certain values have to be written to

specific registers one time only

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Modbus Enhanced Other Features

Will provide Sunrise Sundown Calculation

Three control points will allow to enter Longitude, Latitude and Time Zone

Three points will provide the sunrise time, sundown time and a status signal if it is dark

or daylight

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Modbus Enhanced

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Modbus Enhanced

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