Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 96)

Chapter 8
Troubleshooting
8–5
The Following
Error Exists
Probable Cause Recommended Action
System
Inoperable, No
Major CPU
F lt D t t d
User Program
Logic Error
Monitor logic in Run mode and verify desired I/O status.
Refer to either the Hand-Held Terminal User Manual ,
Catalog Number 1747-NP002, or the Advanced
Programming Software User Manual, Catalog Number
1747-NM002. j
Faults Detected
Defective I/O
Devices or I/O
Wiring
Test inputs and outputs according to I/O troubleshooting
procedures starting on page 8-8 .
The Following
Error Exists
Probable Cause Recommended Action
CPU Memory
Error
Cycle power.
CPU Fault
Faulty Memory
Module
1. Remove power and then remove the memory module
from the controller.
2. Re-energize the controller.
If steady CPU FAULT LED changes to flashing, replace the
existing memory module with a replacement module.
Refer to chapter 4 for removing and installing memory
modules.
Processor
Firmware Installed
Incorrectly
If upgrading the processor to a different firmware level,
verify that the firmware chip orientation matches the
upgrade kit directions.
Refer to the following key to determine the status
of the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
Indicates the LED is FLASHING.
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW