p 142 Maxdpu4f

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Di s t r i b u t e d P r o c e s si n g

Uni t m axDP U4 F

Summary

The Distributed Processing Unit maxDPU4Fis a multifunction controller and data

acquisition processor that executes control

algorithms and sequence logic. It also

performs data acquisition and sequential

events processing time tagged to 1

millisecond resolution.

Key Features

• 10 ms I/O and function block processing

time

• Dedicated I/O Processor for 1 ms SOE

Recording• Windows CE.net for open standards

• No fans, no batteries for low

maintenance, high reliability

• One-to-one redundancy capability with

optional redundant I/O for the ultimate in

availability

• 8,500 function blocks for high capacity

complex control

• Multiple execution speeds to make the

best use of the processor

•Standard serial port link forcommunications

• Dual 100 Mbps highway connections for

high speed

• Software Backplane compliant for speed,

reliability and compatibility

• Optional IRIG input for satellite time

synchronization

• Network hardened to tolerate Ethernet

network abuse

• Fits in single wide maxPAC rack for

higher density• Removable Compact Flash memory for

rapid update and repair

Physical Characteristics

The maxDPU4F resides directly on themaxNET communications network without

the need for servers. It is fully compatible with

maxDNA, maxPAC I/O, MAX 1000 + PLUS

and most MAX1000 Model 564 I/O. The

maxDPU4F mounts in a single wide slot in a

maxPAC 8 PAC rack.

maxNET Interface

Dual Ethernet 10/100Base-T ports are

provided to interface with the maxNET

communication network. All DPUs connect to

redundant standard Ethernet switches. Thebackbone of maxNET between switches can

operate at 100 Mbps and higher.

The maxNET channels are independent. A

fault on one network or processor will not

affect the operation of the other, or cause a

DPU failover.

maxNET provides real-time redundancy. All

critical transactions are fully closed with

alternate network redundancy in milliseconds

guaranteeing the highest performance under

all conditions.

Distributed Processing Unit

maxDPU4F

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Uni t m axDP U4 F

I/O Bus Interface

A dedicated processor on the DPU4F

manages all I/O bus traffic. Up to 60 I/O

modules can reside locally on the bus. The

maximum length of the local I/O bus is 30 ft.

With fiber optic Bus Extender Modules

(BEM), up to 125 modules can be

accommodated at distances up to 6,500 ft.

Power Regulation

maxDPU4F operates from the main

redundant 24 Vdc power supply system in the

maxDNA system cabinets.

Non-volatile FLASH memory maintains the

control strategy configuration even if power is

lost. There is no dependence on any server

during reboot to slow down resumption ofcontrol. Removable Industrial Compact Flash

memory is used.

Serial Port

Optional serial port provides forcommunication to other devices, such as

PLCs when used in conjunction with

maxLINKS.

Control Processor

The CPU is a Pentium compatible National

Semiconductor Geode processor designed

and built for the industrial embedded

application. High temperature tolerance and

low power combine for a rugged offering.

Diagnostics

A comprehensive set of diagnostics are

performed on a continuous basis. All memory

is hardware checked for errors. Multiple

diverse processors check on each other to

insure timely, safe failover if necessary.

Operator’s

maxSTATIONs

Engineer’s

maxSTATIONmaxSTORIAN

maxNET

Y

Cable

DBM DPU4E DPU4F DPU4F

Back-up

Cable

Legacy

I/O

maxPAC

I/O

Legacy

I/O

Common

maxPAC

I/O

MAX 1

MAX 1000

MAX 1000 + PLUS

maxDNA System with maxDPU4F

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Uni t m axDP U4 F

Fully Self Describing Object

Oriented Database All information regarding the operation of the

DPU is kept in DPU memory, including: tag

names, descriptions, tuning constants, alarm

limits, etc. In addition, all graphical

configuration data (sheet number, object

location, wiring) is located in the DPU.

There is no possibility that the configuration

observed is different than that which is

installed.

Objects are stored in a fully hierarchical

database, allowing for easy cut and paste

changes and protection of control strategies.

Fully Software Backplane

CompliantThe DPU can directly access any exposed

data from other DPUs or workstations within

its domain of operation. Peer-to-peer

transfers are rapid and transparent. No

independent transfer agent is required.

The Software Backplane is based upon

subscription services where data is only

transmitted on detection of changes. This

always consumes a minimum of network

bandwidth for the highest performance underall load conditions.

Redundancy and Download

Either DPU of a pair can be active. When a

critical error is detected control is

automatically transferred to the inactive DPU.

Once replaced or re-armed, the failed DPU

becomes the inactive backing up the running

DPU.

DPUs can be downloaded with changes tothe configuration without upsets.

Configuration downloads can be entire

strategies, or as small as a single point. A

fully enforced, object oriented design, allows

encapsulation of control elements to prevent

inadvertent upsets during downloads and

testing of new control strategies.

Processing Capabilities

A multi-speed processing system is built intothe maxDPU4F, which allows objects to be

executed in three different time classes. From

as fast as 10 msec to over 500 msec. Up to

8,500 function blocks can be executed in the

DPU. Blocks can be combined into standard

and custom function blocks that provide

complete control and alarming for an entire

plant equipment group.

Points are executed in a sequence defined by

point hierarchy and position on the graphical

presentation - left to right - minimizing the

need to “engineer” the order of block

execution.

Sequence of Events

Each DPU can monitor up to 500 discrete

inputs as a built-in Sequence-of-Events

(SOE) recorder. These inputs are scanned

1,000 times a second and state changes are

time stamped with 1 ms resolution and stored

in the DPU’s event buffer. Each input has a

separately configurable digital filter for contactdebounce.

Comprehensive Alarming

Each alarm block identifies up to 16 alarm

conditions as a digital status. This permits

sophisticated interlocking control strategies

with all other DPU functions. Each data block

provides a wide range of data acquisition

alarm features including multi-level, rate-of-

change, repetitive delta alarms, adjustable

hysteresis, time delays, re-alarm, and auto-acknowledge features.

All alarms are time tagged by the DPU and

placed in the DPU’s event buffer for

dequeuing by the maxSTATIONs. During a

process upset, it is not necessary to transmit

all information to the workstation as all entries

are time tagged in the DPU.

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©

2 0 1

0 M e t s o P - 1 4 2 - U - 2 / 1 0

For more information, contact your local Metso office.

www.metso.com www.metsoservices.com

Email: [email protected]

MAX 1™, MAX 1000™, MAX 1000 + PLUS® , maxDNA, and maxDNA CR are

trademarks of Metso Automation. All other company and product names areregistered trademarks or trademarks of their respective companies.

Specifications and terms are subject to change without notice.

Quality Coding

All data within the DPU is marked with a

quality code in addition to the output value.

Four quality states are identified Good, Bad,

Doubtful, and Substitute.

The quality code is propagated throughoutthe system so that trend and archive data can

also include quality codes.

Timing

maxDPU4F time stamps process alarms and

events based on its internal clock. A master

DPU can be calibrated to provide stable time.

If more accurate time is required the

maxDPU4F clock time can be periodically

adjusted through maxNET based on the

stable time source within one of themaxSTATIONs. If maxDPU4F time drift

needs to be less than 60 seconds per year an

IRIG-B clock can be directly connected to the

optional IRIG-B coax connector.

Simulation SupportmaxDPU4F has full simulation support built

in. Simulation can also be used for

application testing prior to the availability of

I/O modules. In simulation mode, the DPU

will not access the I/O bus for I/O information.

Instead, there are efficient highwaymessages to read and write simulated I/O

values from maxDNA maxSTATIONs or

external simulation platforms.

In addition, one or more DPUs may be fully

simulated in the Microsoft® Windows

environment of the maxSTATION. This

provides the capability to test algorithms and

control strategies prior to plant

commissioning.

Network Hardened

The DPU protects itself from network problems. TheEthernet driver throws away any messages from

outside its local domain, or any messages that do not

contain valid authentication tokens. The DPU enforces

security - not the workstation! It is not possible to plug

in a laptop to access the DPU without proper password

authorization!

Physical Capabilities

Addresses: 255

I/O Bus Length: 30 ft

I/O Bus Length With BEM: 6,500 ft

Number of I/O Modules per DPU: 125

Number of SOE Modules per DPU: 32

Environment

Operating Ambient Temperature: 0°C to +60°C (local

to DPU)

Storage Ambient Temperature: -25°C to +70°C

Relative Humidity: 5% to 90% non-condensing

RFI / EMI / ESD: Designed to meet IEC 801.2,IEC 801.3, and SAMA PMC 33.1

Processor

Control Processor: National Geode, 128 MByte RAM,

64 MByte Compact Flash

Electrical

System Power: 24 ±4 Vdc

Current: 1.2 A @ 24 Vdc

Model No. PDP401 - maxDPU4FPDP406 - maxDPU4F with IRIG-B

and Serial Port

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