Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 60)

60 Publication 1769-UM019A-EN-P - October 2008
Chapter 4 Module Diagnostics and Troubleshooting
Stand Clear of the Machine
When troubleshooting any system problem, have all personnel remain
clear of the machine. The problem could be intermittent, and sudden
unexpected machine motion could occur. Have someone ready to
operate an emergency stop switch in case it becomes necessary to
shut off power to the machine.
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
Circuits installed on the machine for safety reasons, like over-travel
limit switches, stop push buttons, and interlocks, should always be
hard-wired to the master control relay. These devices must be wired
in series so that when any one device opens, the master control relay
is de-energized, thereby removing power to the machine. Never alter
these circuits to defeat their function. Serious injury or machine
damage could result.
Power Cycle Diagnostics When you cycle power to the module, a series of internal diagnostic
tests are performed. These diagnostic tests must be successfully
completed or the module status indicator remains off and a module
error results and is reported to the controller.
Module Status
Indicator 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 Rockwell
Automation for assistance.