Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 102)

Publication 1746-UM008B-EN-P - December 2006
102 Module Diagnostics and Troubleshooting
Error Codes The error codes applicable to the RTD module range from 50H to
5AH. These are non-recoverable errors. For a description of the error
codes, refer to SLC 500 Instruction Set Reference Manual (Publication
1747–RM001).
Error Code Format
Channel Status LED Indicators (Green)
The channel LED indicator is used to indicate channel status and
related error information contained in the channel status word. This
includes conditions such as the following:
• Normal operation
• Channel-related configuration errors
• Broken input circuit errors such as open- or short-circuit (RTD
units only)
• Out-of-range errors
All channel errors are recoverable errors and after corrective action,
normal operation resumes.
Invalid Channel Configuration
Whenever a channel’s configuration word is improperly defined, the
channel LED indicator blinks and bit 15 of the channel status word is
set. Configuration errors occur for the following invalid combinations.
• Input type is a 10 Ω Copper RTD and the excitation current is set
for 0.5 mA, which is not allowed
• Scaling select bits 13 and 14 are set to 11, which is invalid
• Broken Input select bits 6 and 7 are set to 11, which is invalid
• Scaling select bits 13 and 14 are set to 01 or 10 and scaling limit
words=0
• Data format bits are set to 11 (proportional counts), the
scaling-select bits are set to 01 or 10 and the lower limit user-set
scale word is greater than or equal to the upper limit user-set
scale word
YY ± Error Code (Hex)
X X Y Y
XX ± Chassis Slot Number (Hex)