Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 224)

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ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
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) Set the Status Variable Address.
10) Specify the Slave Wait Interval (in milliseconds), or accept the default.
11) Set the Ping Mode and Ping Interval. The interval is specified in milliseconds. If
you are using ping (which uses the Read Holding Register mode), specify the
Ping Address as well; otherwise accept the default 0.
12) Click Apply.
Choosing Names for Modbus Objects
The Modbus object Name identifies a Modbus master object or slave link within the
AADvance Workbench, and is included in printed reports; but it is not used by the
application. We recommend that you use a different name for each object.
Alternatively, accept the default name.
Modbus Slave ID
Each Modbus RTU slave link object has a Unit Id. This is the Modbus
communication ID — a unique identifier for the Modbus slave device. It must be
unique for every slave link configured for a particular master.
Modbus Slave Wait Interval
The Slave Wait Interval is specified individually for each Modbus slave; it is the
minimum amount of time the master will wait from the start of one message to a slave
to the beginning of the next message to the same slave.
Modbus Ping Mode, Interval and Address
The ping mode is specified individually for each slave; it defines the action the Modbus
master should take if the slave fails to respond after the specified number of retries.
The AADvance controller supports a Function Code 08 ping mode for Modbus RTU
slaves; choose this if the slave supports it because it is a short message. The Read
Holding Register mode is an alternative; choose this if the slave does not support
Function Code 08. The Modbus master will try to read a single register. Read
Holding Register is the only method available to ping a Modbus TCP slave. You can
also set a Do Not Ping setting for both protocols.
The ping address is for the Read Holding Register mode and is also specified
individually for each slave; it is the Modbus address of the holding register. It is not
used by the Function Code 08 mode.