Rockwell Automation 1769-OF4VI Compact I/O Isolated Analog Modules - Manual (Page 75)

Publication 1769-UM014B-EN-P - May 2010
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 or under-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 Cycle Diagnostics
When you cycle power to the module, 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 module 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, over-range and under-range, open-circuit (input module in 4 to 20 mA
current range and all voltage ranges).
Out-of-range Detection (Input and Output Modules)
For input modules, whenever the data received at the channel word is out of
the defined operating range, an over-range or under-range error is indicated in
the Input Data file.
For output modules, whenever the controller is driving data over or under the
defined operating range, an over-range or under-range error is indicated in the
Input Data file.
Table 5.1 Diagnostics
Module Status LED Condition Corrective Action
On Proper
Operation
No action required.
Off Module Fault Cycle power. If condition persists, replace
the module. Call your local distributor or
Rockwell Automation for assistance.