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Chapter 5
Module Diagnostics and Troubleshooting
Module Operation vs.
Channel Operation
Power-up Diagnostics
42
Program Alteration
There are several possible causes of alteration to the user program, including
extreme environmental conditions, Electromagnetic Interference (EMI),
improper grounding, improper wiring connections, and unauthorized
tampering. If you suspect a program has been altered, check it against a
previously saved program on an EEPROM or UVPROM memory module.
Safety Circuits
Always hard wire circuits installed on the machine for safety reasons, such as
overtravel limit switches, stop push buttons, and interlocks, to the master
control relay. You must wire these devices in series so that, when any one
device opens, the master control relay is de-energized and removes power to
the machine. Never alter these circuits to defeat their function. Serious injury
or machine damage could result.
The module performs operations at two levels:
•
module level – power-up, configuration, and communication with a
controller
•
channel level – data conversion and over- or underrange detection
Internal diagnostics are performed at both levels of operation. When detected,
module error conditions are indicated by the module status and individual
channel status indicator lights.
Module Status
At module power-up, a series of internal diagnostic tests is performed. These
diagnostic tests must be successfully completed.
indicator operation.
Table 32 - Module Status Indicator
Status Indicator
Status
Steady red
Flashing red
Module status
Steady green
Flashing green
Off
Rockwell Automation Publication 1790-UM001B-EN-P - April 2021
Table 32
shows module status
Description
Unrecoverable fault in base unit
Recoverable fault
Normal operation
Stand by
No power
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