Hitachi NJI-350B manual Process flow when an error occurred is shown below, 13-3

Chapter 13 Troubleshooting

(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	Reference the word
internal output (14-1).	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.

	If there are spare parts available, replace the parts.		Contact our service
			department.
Error code	Error name	Corrective action
11	System ROM error	Restart the power.
12	System RAM error	If the same error occurs, it is a hardware error in the CPU module, so replace the CPU module
13	Microcomputer error	with a spare.
1F	System program error	Make sure that there are no machines, etc. that generate excessive noise near MCRO-EH.
23	Undefined instruction	Note: The 1x error cannot be verified since peripheral units cannot be connected until the
27	Data memory error
		system starts up after powering on again.
	Power shut-off, power	Check the power supply voltage of the basic unit and expansion unit.
	supply error
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	This may be displayed when the contents of the memory within the basic unit is unstable.
	error	If the same error occurs after initialization, replace the basic unit with a new one.
34	Syntax/assembler	There is a syntax/assembler error in the user program.
	error	Verify the program and I/O assignment.
41	I/O information	Check the I/O assignment.
	verification error	Check the expansion cable connection.
44	Congestion error	Change the program so that the scan time of the user program is less or change the congestion
	(normal scan)	check time.
45	Congestion error	Change the program so that the periodic interrupt program execution time is less.
	(periodic scan)
46	Congestion error	Perform interlock externally to that the same interrupt will not occur during interrupt
	(interrupt scan)	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.

13-3