Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016 103
Get Diagnostic Status from Modules by Using Explicit Messaging Appendix A
This selection creates a two-byte input assembly, as shown for the
1791ES-IB8XOBV4 module.
2. Use the CombinedInputStatus and CombinedOutputStatus bits to
detect if one or more of the I/O points on the module have a fault.
• If any input or output status bit goes to a value of 0 (0=error, 1=no
error), use the CombinedInputStatus and CombinedOutputStatus
bits to condition your MSG rungs as follows.
• The second rung can be used to read the status on mode transition
and once a fault is detected, continue reading until the fault is
corrected.
• Place these rungs in the standard task.
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