Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 13)

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 13
Isolated Analog I/O Module Operation in the ControlLogix System Chapter 1
If controller configuration refers to a chassis slot in the system, the controller
periodically checks for the presence of a device there. If a device is detected, the
controller sends the configuration, and one of the following occurs:
• If the configuration is appropriate to the module detected, a connection is
made and operation begins.
• If the configuration is not appropriate to the module detected, the data is
rejected and the Logix Designer application indicates that an error
occurred.
The configuration can be inappropriate for any of a number of reasons. For
example, a module’s configuration can include a mismatch in electronic
keying that prevents normal operation.
The controller maintains and monitors its connection with a module. Any break
in the connection, for example, the removal of the module from the chassis while
under power, causes a fault.
The Logix Designer application indicates that the fault occurred in the fault
status bits associated with the module. The Logix Designer application monitors
the fault status bits to annunciate the module’s failures.