Chapter 3 General Specifications
3 – 48
3.16 Troubleshooting
Error code
The CPU has 7-segment display and error LED to indicate an error code as listed below. If two or more errors are
detected at the same time, smaller error code has higher priority to be displayed. If error is detected, read the
descriptake following countermeasures depending on error level.
ERR LED
RUN LED
E.CLR button
7 - segment LED
Error code Error level Countermeasure
88, 11 to 1F Serious error Cycle power. If it does not solve, contact your local supplier.
20 to 31 Exception Exception status is cleared only by Reset operation.
Execute Reset cold/warm/origin by EHV-CoDeSys
70 to 78 Warning User program execution does not stop by warning. If you need to activate alarm or
any action by warning, use CmpHitachi library.
Press E.CLR button to clear error code.
Err.
code
Error name
[Detected when]
Description PLC
system
Applica-
tion
ERR
LED
88 Microprocessor failure
[Power on]
Overflow of internal watchdog timer due to
system program error.
Stop Stop
11 System program error
(FLASH)
[Power on]
Checksum value of system program (Runtime)
in FLASH does not match the checksum
calculated.
Stop Stop
12 System RAM failure
[Power on]
Read/write check for system RAM has failed. Stop Stop
13
Misalignment /
Illegal instruction /
Privileged instruction
[Always]
Microprocessor has detected an exception
processing in system program.
Stop Stop
15 Program RAM failure
[Power on]
Read/write check for program RAM has failed. Stop Stop
16 System program error
(system RAM)
Checksum value of system RAM does not match
the checksum calculated.
Stop Stop
18 MAC address error
[Power on]
MAC address is missing or wrong value. Stop Stop
19 Data memory failure
[Power on]
Read/write check for data memory (RAM) has
failed.
Stop Stop
1F System program error
(FLASH)
[Always]
Checksum value of system program (reset
process) in FLASH does not match the
checksum calculated.
Stop Stop
: ON, : Blink, : OFF
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