Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 228)

 

9-42 Document: 553633
ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
Value Meaning Description
0 Inactive Disables the slave link
Slave is neither polled or pinged
1 Standby Forces the slave link to operate in its standby mode
Modbus master continues to ping the slave to make
sure that communications are possible
2 Active Forces the slave link to operate in its active mode
Slave is being polled for data
Note: If the application sets the register to any other value, the slave link is disabled.
Modbus Slave Link Status Register
The status register is an unsigned integer value (UINT) that is returned by the Modbus
driver to allow the application to monitor and act on faults. If you do not specify a
status register address, then the slave link does not report its status information to the
application. The variable in the application Dictionary has the values listed in the table.
Table 32: Modbus Slave Status Register
Value Meaning Description
0 Healthy Slave is operating normally
Link is active, no errors reported
1 Initializing/unavailable The slave link is initializing
This value is also reported if the slave device has failed
to respond to a ping on a link declared as standby; if
the Modbus master is in error; or if the Modbus
master is set to inactive
2 Communications failure Slave is being polled for data and is not responding
3 Error/exception The last message to the slave resulted in an exception
response
Note: The status value may toggle between 0 and one of the other values because as
soon as a good response is received then the status is set to the healthy value.