Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (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 O

utput Modul

es)

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.

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 75