Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 99)

99 Publication 1746-UM008B-EN-P - December 2006
Chapter
7
Module Diagnostics and Troubleshooting
Introduction This chapter describes troubleshooting using the channel status LED
indicators as well as the module status LED indicator.
A troubleshooting flowchart is shown on page 105.
The flowchart 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 the following:
• Module operation vs. channel operation
• Power-up diagnostics
• Channel diagnostics
• LED indicators
• Troubleshooting flowchart
• Replacement parts
• Contacting Rockwell Automation
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 (RTD units only)
detection.
Internal diagnostics are performed at both levels of operation and any
error conditions detected are immediately indicated by the module’s
LED indicators and status to the SLC processor.