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Allen-Bradley Modbus Communications for PanelView Terminals 2711-69

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1Publication 2711-6.9 User GuideModbus Communications for PanelView TerminalsIntroductionThis document describes how to connect and configure communications for the Modbus versions of the PanelView terminals. This document provides supplemental information for the PanelBuilder32 manuals.For more information about:Go to page:Related Publications2Before using this Guide2Modbus Protocol3Modbus PanelView Terminals3Typical Modbus Network4Connector Pinout Definitions7Serial Port Connection8Modifying Modbus Settings from Terminal9Setting up Communications using PanelBuilder3211Modbus Address Spaces14Modbus Controller Data Table15Data Formats16Tag Editor16Downloading Applications over a Serial Link19Error Messages and Codes20Glossary24Publication 2711-6.9 - March 20002 Modbus Communications for PanelView Terminals Related publicationsThe following documentation provides additional information on installing, configuring and using your PanelView terminals.The Modicon website provides information and product descriptions of Modbus products at:www.modicon.comBefore using this guideWe assume that you are familiar with Modbus communications. Since we cannot provide specific information about every type of application the PanelView might be used in, the information provided in this document is general, rather than specific.Refer to glossary at the end of this publication for definitions of unfamiliar terms.Publication TitlesNumberPanelBuilder32 Getting Results Manual2711-6.19PanelBuilder32 Quick Start Manual2711-6.20PanelView Operator Terminal Manual2711-6.1Publication 2711-6.9 Modbus Communications for PanelView Terminals 3Modbus protocolModbus protocol links Modicon Programmable Controllers and devices emulating Modicon Programmable Controllers in a wide variety of applications. Modbus protocol defines a message structure that controllers can use regardless of the network type over which they communicate.Modbus is a half-duplex, master-slave communications protocol. The network master (PanelView) reads and writes coils and registers as if it was a Modicon controller. Every device on a Modbus communication link emulates the coils and registers of a Modicon Programmable Controller. Modbus allows a host to read and write coils/registers and obtain diagnostic information.Modbus protocol allows a single master to communicate with a maximum of 255 slave devices. The master device on a Modbus network is not assigned an address.Modbus PanelView TerminalsModbus terminals are identified by a 14 at the end of the catalog number, for example 2711-K9C14.The Modbus terminals have:•Modbus communication port•RS-232 printer/file transfer portIn addition, each terminal is available with either: •AC or DC power The characters L1 at the end of the catalog number designate a terminal with DC power (e.g. -T9A14L1).Publication 2711-6.9 - March 20004 Modbus Communications for PanelView Terminals Typical Modbus NetworkShown below is a typical Modbus network with Modbus Controllers installed on two of the network drops.PanelViewMaster Device(1 per Network)Modbus PortRS-485/422Computer for developing PanelView applicationsPrinterRS-232 PortModbus Programmable Controlleror Device Emulating a Controller(Slave Device)Modbus Programmable Controlleror Device Emulating a Controller(Slave Device)Modbus +Serial LinkorPublication 2711-6.9 Modbus Communications for PanelView Terminals 5Connection to a Modbus Plus NetworkUsing a Bridge Multiplexer (BM85) or an RF modem, the Modbus PanelView can be connected to a Modbus Plus network.Modbus Plus is a local area network supporting up to 64 nodes at a data transfer rate of 1,000,000 bits/second. Modbus Plus provides host level peer-to-peer communication for network devices. The network also provides distributed input/output (DIO) communications. The BM85 Bridge Multiplexer provides connection to a Modbus Plus network through the PanelView Modbus RS-232 serial port.Modbus +Modbus +PanelViewRS-232PortCable - PanelView to BM85Bridge MultiplexerB M85RFModemRFModemModbus PanelViewBM8523532456789RS-232PortModbus PanelView

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