Rockwell-automation 1766-Lxxxx MicroLogix 1400 Programmable Controller User Manual download pdf (Page 202)

162 Rockwell Automation Publication 1766-UM001H-EN-P - May 2014

Appendix C Troubleshooting Your System

Analog Expansion I/O

Diagnostics and

Troubleshooting

Module Operation and Channel Operation

The module performs operations at two levels:

• module level

• channel level

Module-level operations include functions such as power-up, configuration, and

communication with the controller.

Internal diagnostics are performed at both levels of operation. 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 reported in the controller’s

I/O status file. Refer to the MicroLogix 1400 Programmable Controllers

Instruction Set Reference Manual, publication 1766-RM001

for more

information.

When a fault condition is detected, the analog outputs are reset to zero.

Power-up Diagnostics

At module power-up, a series of internal diagnostic tests are performed.

Module Status LED State Table

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. Call your local distributor or Allen-Bradley

for assistance.

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