Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Uživatelský manuál stáhnout pdf (Strana 49)

100

101

Publication AG-UM008C-EN-P - February 2005

Configuring Enhanced PLC-5 Processors 2-11

Configuring a DF1

Half-Duplex

Message-based Mode

Master Station

Choose message-based communication mode if you want to use MSG

instructions in user programming to communicate with one station at

a time. If your application uses satellite transmission or public

switched telephone network transmission, consider choosing

message-based. Communication to a slave station can be initiated on

an as-needed basis.

Also choose message-based mode when a redundant PLC-5 system is

being used as a master station. Connect both PLC-5 processor serial

ports to the master station modem through an RS-232 modem splitter

and precondition all MSG instructions with the Primary Processor

status bit.

With message-based mode, you do not have an active station file that

you can use to monitor station status. Also, you cannot implement

slave-to-slave messaging or slave programming over the telemetry

network.

To configure the processor for a master station using message-based

communication, place the processor in program mode and follow the

steps below using RSLogix 5:

1. Double-click on the Channel

Configuration file to bring up

the Edit Channel Properties

interface.

2. On the Channel 0 tab, choose

System (Master) for your

Communication Mode.

3. Configure the Serial Port,

Options, and Polling

parameters according to

Table 2.3.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 419 420

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