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Chapter 13 Troubleshooting
13-3
(2) Corrective actions when an error occurred
The process flow when an error occurred is shown below.
Error occurred
Reference the bit special
internal output (14-1).
Reference the word
special internal output
(14-2).
Reference the grammar/
assemble error (WRF001)
detailed data (13-2) and
remove the error cause.
Reference the operation
error (WRF015) detailed
data (13-3) and remove
the error cause.
Remove the error cause according to the corrective action for each error code as shown below.
Contact our service
department.
If there are spare parts available, replace the parts.
Error is detected by the CPU module and displayed by lit/flashing/not lit
of RUN and OK LEDs.
Verify the self-diagnostic error code (WRF000) with the RUN and OK
LED statuses or using a peripheral unitand refer to error code list.
Error code Error name Corrective action
11 System ROM error
12 System RAM error
13 Microcomputer error
1F System program error
23 Undefined instruction
27 Data memory error
Restart the power.
If the same error occurs, it is a hardware error in the CPU module, so replace the CPU module
with a spare.
Make sure that there are no machines, etc. that generate excessive noise near MCRO-EH.
Note: The 1x error cannot be verified since peripheral units cannot be connected until the
system starts up after powering on again.
Power shut-off, power
supply error
Check the power supply voltage of the basic unit and expansion unit.
31 User memory error The contents of the user program is destroyed. Perform initialization and transfer the program
again.
This is displayed when the machine is stored with a worn-out battery or without battery for a
long period of time.
33 User memory size
error
This may be displayed when the contents of the memory within the basic unit is unstable.
If the same error occurs after initialization, replace the basic unit with a new one.
34 Syntax/assembler
error
There is a syntax/assembler error in the user program.
Verify the program and I/O assignment.
41 I/O information
verification error
Check the I/O assignment.
Check the expansion cable connection.
44 Congestion error
(normal scan)
Change the program so that the scan time of the user program is less or change the congestion
check time.
45 Congestion error
(periodic scan)
Change the program so that the periodic interrupt program execution time is less.
46 Congestion error
(interrupt scan)
Perform interlock externally to that the same interrupt will not occur during interrupt
processing. Change the program so that the execution time of the interrupt program is short.
5F Backup memory error There is a possibility that the FLASH memory cannot be written to. Reset the power after the
user program is read and saved to the peripheral units.