Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 61)

Publication 1769-UM019A-EN-P - October 2008 61
Module Diagnostics and Troubleshooting Chapter 4
Channel Diagnostics When any channel is enabled, the module performs a diagnostic
check to see that the channel has been properly configured. In
addition, the module checks each channel during every conversion
cycle for input channel over-range and under-range, input channel
high and low process alarm conditions, and output channel high and
low clamp conditions.
Out-of-range Detection
Whenever data received at an input is out of the defined normal
operating range, an over-range or under-range error is indicated in the
Input Data file.
Process Alarm Detection
Whenever data received at an input meets or exceeds that channel’s
configured process alarm limits, a high alarm or low alarm error is
indicated at the Input Data file.
Output Clamp Detection
Whenever data is sent to an output that meets or exceeds that
channel’s configured clamp limits, a low or high clamp error is
indicated in the Input Data file.
Non-critical Versus Critical
Module Errors Non-critical module errors are typically recoverable. Channel errors
(over-range or under-range errors, process alarms, and open circuit
errors) are non-critical. Non-critical errors are indicated in the module
input data table.
Critical module errors are conditions that prevent normal or
recoverable operation of the system. When these types of errors
occur, the system typically leaves the run or program mode of
operation until the error can be dealt with.
Critical module errors are indicated in Error Codes on page 63 .