Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 207)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
9-21
Configure a Modbus Master Object for Modbus RTU
Note: You have to create a Modbus Master object before you can carry out this task.
You have to configure the communications and control settings for a Modbus Master
object for Modbus RTU when you want to use the Modbus RTU protocol. Do the
following:
1) Select the Equipment tab on the Project tree view and then select the Modbus
master object you want to configure.

The editor for the Modbus master object opens.
2) Select the General tab.
3) Enter a suitable name for the Modbus master object, or accept the default. You
can use any combination of alphanumeric characters and punctuation, including
spaces.
4) Ensure that the Protocol is set to RTU (the default), click Apply.
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The editor has three tabs; the tabs are named General, Broadcast and
Statistics.
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The Workbench sets the Port Type to Serial.

The Workbench sets the Port Id to the first serial port on the associated
processor module.
5) Set the Port Id to match the identity of the serial port you will use for the link to
the Modbus slave(s).
6) Set the Timeout (in milliseconds) to suit the system, or accept the default value.
Note: We recommend the Timeout be set to a value less than 3,000ms.
7) Set the Message Wait Interval (in milliseconds) to suit the slave devices, or accept
the default value.
8) If you intend to use the control variable, set the Control Variable Address to the
Modbus address of the holding register; otherwise accept the default 0 to disable.
9) Similarly set the Status Variable Address.
10) Click Apply.