Hitachi HIDIC MICRO-EH Applications Manual page 278

(2) Corrective actions when an error occurred
The process flow when an error occurred is shown below.
Error occurred
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.
Reference the bit special
internal output (14-1).
Remove the error cause according to the corrective action for each error code as shown below.
If there are spare parts available, replace the parts.
Error code Error name
11 System ROM error
12 System RAM error
13 Microcomputer error
1F System program error
23 Undefined instruction
27 Data memory error
 Power shut-off, power
supply error
31 User memory error
33 User memory size
error
34 Syntax/assembler
error
41 I/O information
verification error
44 Congestion error
(normal scan)
45 Congestion error
(periodic scan)
46 Congestion error
(interrupt scan)
5F Backup memory error There is a possibility that the FLASH memory cannot be written to. Reset the power after the
Reference the word
special internal output
(14-2).
Reference the grammar/
assemble error (WRF001)
detailed data (13-2) and
remove the error cause.
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.
Check the power supply voltage of the basic unit and expansion unit.
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.
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.
There is a syntax/assembler error in the user program.
Verify the program and I/O assignment.
Check the I/O assignment.
Check the expansion cable connection.
Change the program so that the scan time of the user program is less or change the congestion
check time.
Change the program so that the periodic interrupt program execution time is less.
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.
user program is read and saved to the peripheral units.
13-3
Chapter 13 Troubleshooting
Reference the operation
error (WRF015) detailed
data (13-3) and remove
the error cause.
Contact our service
department.
Corrective action