Rockwell Automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I/O Combination Module - Manual (Page 63)

Publication 1769-UM008A-EN-P - November 2001
Module Diagnostics and Troubleshooting 5-3
Internal diagnostics are performed at both levels of operation. When
detected, module error conditions are immediately indicated by the
module status LED. Both module hardware and channel configuration
error conditions are reported to the controller. Channel over-range
conditions are reported in the module’s input data table. Module
hardware errors are typically reported in the controller’s I/O status
file. Refer to your controller manual for details.
Power-up Diagnostics At module power-up, a series of internal diagnostic tests are
performed. These diagnostic tests must be successfully completed or
the module status LED remains off and a module error results and is
reported to the controller.
Channel Diagnostics When an input or output 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 on every
scan for configuration errors and over-range conditions.
Out-of-Range Detection
For input channels, whenever the data received at the channel word is
out of the defined operating range, an over-range error is indicated in
input data word 4, bits 0 to 3 for input channels 0 through 3,
respectively.
For output channels, whenever the controller is driving data over the
defined operating range, an over-range error is indicated in the input
data word 5, bits 0 and 1 for output channels 0 and 1, respectively.
If module status LED is: Indicated condition: Corrective action:
On Proper Operation No action required.
Off Module Fault Cycle power. If condition persists,
replace the module.