User manual

108 Rockwell Automation Publication 1769-UM011I-EN-P - February 2013
Chapter 7 Develop Applications
Determine if I/O Module Communication Has Timed Out
If communication times out with a device (module) in the I/O configuration of
the controller, the controller produces a fault code for the module.
• The GSV instruction gets the fault code for IO_Module and stores it in
the Module_Status tag.
• If Module_Status is any value other than 4, the controller is not
communicating with the module.
Figure 21 - I/O Module Communication