Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 157
Appendix C Troubleshoot Your System
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.
Critical and Non-Critical Errors
Non-critical module errors are recoverable. Channel errors (over-range or
under-range errors) are non-critical. Non-critical error conditions are
indicated in the module input data table. Non-critical configuration errors are
indicated by the extended error code. See Table 19 on page 158
.
Critical module errors are conditions that prevent normal or recoverable
operation of the system. When these types of errors occur, the system leaves
the run mode of operation. Critical module errors are indicated in Table 19 on
page 158.
Module Error Definition Table
Analog module errors are expressed in two fields as four-digit Hex format with
the most significant digit as “don’t care” and irrelevant. The two fields are
“Module Error” and “Extended Error Information”. The structure of the
module error data is shown below.
Module Error Field
The purpose of the module error field is to classify module errors into three
distinct groups, as described in the table below. The type of error determines
what kind of information exists in the extended error information field. These
types of module errors are typically reported in the controller’s I/O status file.
See MicroLogix 1400 Programmable Controllers Instruction Set Reference
Manual, publication 1766-RM001
for more information.
.
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.
Module Error Table
“Don’t Care” Bits Module Error Extended Error Information
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0000000000000000
Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1
Module Error Types
Error Type
Module Error Field Value
Bits 11 through 09 (Binary)
Description
No Errors 000 No error is present. The extended error field holds no additional information.
Hardware Errors 001 General and specific hardware error codes are specified in the extended error information field.
Configuration Errors 010
Module-specific error codes are indicated in the extended error field. These error codes correspond to
options that you can change directly. For example, the input range or input filter selection.
To Next Page
Loading...
Need help?
General
