Momentum Sales & Marketing 170 PNT Series Network Configuration, Limit Types, Devices on, Maximum

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Modbus Plus for DIO Servicing

Network Configuration

Overview

This section contains guidelines for configuring a Modbus Plus network for

 

distributed I/O servicing.

 

Limit Types of

 

 

To ensure deterministic timing, the network should consist of just one programmable

Devices on

controller node and the required group of I/O nodes.

Network

Non-I/O devices, such as additional controllers, programmers, or operator

 

 

interfaces, should communicate with the I/O network controller through a separate

 

Modbus Plus network or other type of connection.

Maximum

 

 

The table below summarizes the Modbus Plus network’s maximum configuration for

Configuration

a distributed I/O application consisting of Momentum products.

 

 

 

 

Parameter

Specification

 

 

 

 

max. number of nodes

64 including Controller

 

 

 

 

max. distance between two nodes

450 m (1500ft)

 

 

 

 

min. distance between two nodes

3 m (10ft)

 

 

 

 

max. length of network

450 m (1500ft)

 

 

 

 

max. number of data words (16-bit words)

500 input, 500 output

 

 

 

 

max. number of I/O points (16 bits/word)

8000 input, 8000 output

 

 

 

 

 

 

870 USE 103 00 May 2001

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Contents PNT Series USE 103 00 May Table of Contents USE 103 00 May Models About the BookAt a Glance Document ScopeUSE 103 00 May Chapter? IntroductionPurpose What’s in thisFunction DiagramProduct Overview OverviewIntroduction Modbus Plus Status IndicatorsIndicators Active IndicatorIndicator 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 Electrical Connections Between the Adapter and I/O BasePhysical ConnectionsOverview 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 Devices on Network ConfigurationConfiguration Limit TypesModbus 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 Functions Access toOverview of Register Types Register TypesDiagram of Register Types All other registers can be accessed using Mstr blocks Data RegistersOutput data to field outputs Parameters Configuration RegistersModule Timeout RegisterModule Ownership Registers Parameters Block Function Operating parameters Module Status Status RegistersAscii header block Module Status4FC01+Byte ASCIICharacters Offset Meaning Ascii HeaderBlock Function Ascii Header BlockExamples 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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