Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 212)

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ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
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.
Modbus Ping Mode Settings - RTU
To check the settings do the following:
Function Code 08 Ping Mode Setting
1) Select the Equipment tab on the Project tree and then a Modbus master object
that has been set up to run the RTU protocol.
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Check this by selecting the General tab and that the Protocol row is set to
RTU.
2) Select the slave link associated with the master object.
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The editor for the slave link opens.
3) Select the General tab.
4) Check that the Ping Mode has been set for Function Code 08.