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Chapter 12 Error Code List and Special Internal Outputs
12-1
Chapter 12 Error Code List and Special Internal
Outputs
12.1 Error Codes
The table below indicates the self-diagnostic error codes. (See Chapter 13, “Troubleshooting” about corrective actions.)
Error codes are output as hexadecimal values to the special internal output WRF000. (This special internal output is
saved during power failure, and is retained even when the causes of the error are eliminated. Also, when multiple errors
occur, the most fatal error in the error classification is stored.)
Note: LED examples The occurrence of a flashing pattern other than the following means a micro computer error.
However, an error code is not reflected in the special internal output in this case.
: ON : OFF : Flashing (1 s ON, 1 s OFF) : Flashing (500 ms ON, 500 ms OFF) : Flashing (250 ms ON, 250 ms OFF)
Related special
internal output
Error
code
Error name
[detection timing]
Classifi
-cation
Description
RUN
LED
OK
LED
Ope-
ration
Bit Word
11 System ROM error
[at power ON]
Fatal
error
The system ROM has a checksum
error or cannot be read
Error in built-in ROM/FLASH )
Stop
12 System RAM error
[at power ON]
Fatal
error
The system RAM cannot be read
and/or written properly
Stop
13 Micro computer error
[always checking]
Fatal
error
Address error interrupt, undefined
instruction interrupt occurred in the
micro computer
Stop R7C8
Reset processing in
progress
[at power ON]
CPU is being reset. Stop
1F System program error
[always checking]
Fatal
error
System program in FLASH memory
has a checksum error
Stop
23 Undefined instruction
[at starting RUN]
Serious
error
Error is detected when an attempt is
made to execute a user program
instruction that cannot be decoded
(undefined instruction)
Stop R7C9
27 Data memory error
[at power ON and
initializing CPU]
Serious
error
Data memory cannot be read/written
properly.
Stop
31 User memory error
[at power ON and during
RUN]
Serious
error
A checksum error is detected in user
memory.
Stop R7CA
33 User memory size error
[at starting RUN]
Serious
error
User program capacity set by the
parameter is other than 280 HEX.
Stop R7CC
34 Grammar/assemble error
[at starting RUN and
online change in RUN]
Serious
error
There is a grammatical error in user
program.
Stop R7D4 WRF001
41 I/O configuration error
[always checking]
Minor
error
• I/O assignment information and
actual loading of module do not
match
• Assignment is made for expansion
level 5 or greater.
• There exists assignment of 5 slots or
greater.
*1 Stop
*2
R7CD WRF002
44 Overload error
(normal scan)
[at END processing]
Minor
error
Execution time for normal scan
exceeded the overload check time set
by the parameter.
*1 Stop
*2
R7D1
45 Overload error
(periodical scan)
[periodical processing]
Minor
error
Execution time for periodical scan
exceeded the execution period.
*1 Stop
*2
R7D2
46 Overload error
(interrupt scan)
[during interrupt
processing]
Minor
error
An interrupt of the same cause
occurred during interrupt scan
*1 Stop
*2
R7D3