Momentum Sales & Marketing 170 PNT Series manual How Messages are Transacted

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Communication Adapter Message Handling

How Messages are Transacted

Overview

This section explains how a Communication Adapter relays information between its

 

I/O base and a programmable controller.

The Right to

 

A token frame is passed from node to node in a rotating address sequence. The

Transmit

node currently holding the token has the sole right to transmit. All other nodes

 

monitor the network and extract messages addressed to them.

Messages from

 

When a Communication Adapter at an input base module acquires the token, it

Communication

transmits its message to the programmable controller node. The message data

Adapters

describes the current states of the signals at the base’s field input terminals.

 

The controller reads the message and steers its contents into the data registers

 

defined for that adapter’s address in the controller’s Peer Cop table.

Messages to

 

When the programmable controller acquires the token, it transmits its messages to

Communication

the Communication Adapters. Messages are sent to the node addresses defined in

Adapters

the controller’s Peer Cop table, with the message contents taken from the data

 

registers defined in the table.

 

Each Communication Adapter at an Output base module uses its received message

 

to control the field devices connected to the base’s output terminals.

 

 

870 USE 103 00 May 2001

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Contents PNT Series USE 103 00 May Table of Contents USE 103 00 May At a Glance About the BookDocument Scope ModelsUSE 103 00 May Purpose IntroductionWhat’s in this Chapter?Product Overview DiagramOverview FunctionIntroduction Indicators Status IndicatorsActive Indicator Modbus PlusIndicator Red Status Modbus Plus Channel Error IndicatorsAddress Switches Module addressTwo Rotary Example of Node Address Assignment Upper Address SwitchPorts and Cabling PortsCabling Introduction Assembling a Communications Adapter and I/O Base Physical Connections Between the Adapter and I/O BaseConnections ElectricalOverview Procedure Assembling an Base and an Adapter Assembling the I/O Base and the AdapterStep Step Labeling the Assembled Module Overview What Goes on the Label? Example of a LabelDescription Disassembling an Adapter from an I/O Base Step Assembling Adapter and I/O Base Purpose What’s in this Chapter? Using Modbus Plus for Distributed ServicingStrategies for Distributed I/O Servicing Configuration Network ConfigurationLimit Types Devices onModbus Plus Network Layouts Single CableExample Dual Cable Example below illustrates a dual cable configurationModbus Plus for DIO Servicing How Communication Adapters Handle Messages How Messages Are Defined in the Application How Messages are Transacted Communication Adapter Message Handling Communication Access Registers Overview of Register Types Access toRegister Types FunctionsDiagram of Register Types All other registers can be accessed using Mstr blocks Data RegistersOutput data to field outputs Module Timeout Configuration RegistersRegister ParametersModule Ownership Registers Parameters Ascii header block Status RegistersModule Status Block Function Operating parameters Module StatusBlock Function Ascii Header Ascii HeaderBlock 4FC01+Byte ASCIICharacters Offset MeaningExamples of an Ascii Header Block ADM 350 00 Discrete 16-Point Input, 16-Point Output ModuleAAO 120 00 Analog 4-Channel Output Module Communication Access Registers

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