Specifications

10–10 Troubleshooting
Publication 1747-6.2
The Following
Error Exists
Probable Cause Recommended Action
The SLC 5/02
processor is
receiving data,
but is not
communicating
with the
programmer.
DH-485
communication
parameters are
improperly set up.
1. Check communication parameters of programmer.
Programmer and processor baud rate must match.
Programmer and processor node addresses must be
different.
2. Try different combinations of:
a. baud rate (Processor default is 19200.)
b. node address (Processor default is 1.)
3. Try to increase the maximum node address. (Default
is 31.)
The Following
Error Exists
Probable Cause Recommended Action
A fatal error has
occurred.
Excessive noise or
a faulty SLC 5/02
processor.
1. Cycle power to obtain flashing CPU FAULT LED and
default program.
2. Examine the error code following the power cycle.
Take appropriate action.
3. Reload your program.
4. Contact your local Allen-Bradley representative if the
error persists.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀
The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
Indicates the LED is FLASHING or OFF.
POWER
RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:
➀
POWER
RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:
➀