User Manual

1 Publication 1746-UM003A-EN-P
Chapter 6
Module Diagnostics and Troubleshooting
This chapter describes troubleshooting using the channel status LEDs as well
as the module status LED. A troubleshooting flowchart is shown on page 6-6.
It explains the types of conditions that might cause an error to be reported and
gives suggestions on how to resolve the problem. Major topics include:
• module operation vs. channel operation
• power-up diagnostics
• channel diagnostics
• LED indicators
• troubleshooting flowchart
• replacement parts
• contacting Allen-Bradley
Module Operation vs.
Channel Operation
The RTD module performs operations at two levels:
• module-level operations
• channel-level operations
Module-level operations include functions such as power-up configuration and
communication with the SLC processor.
Channel-level operations describe channel-related functions, such as data
conversion and open-circuit or short-circuit (RTDs only) detection.
Internal diagnostics are performed at both levels of operation and any error
conditions detected are immediately indicated by the module’s LEDs and
status to the SLC processor.