6-5
6 Troubleshooting
CP1E CPU Unit Hardware User’s Manual(W479)
6-1 Troubleshooting CPU Unit Errors
6
6-1-5 Types of Errors
z Directly Monitoring the Area where Error Log Information is Stored
1
Connect the CX-Programmer online.
2
Read words A100 to A199.
3
Check the error status from the registered data.
The type of error that has occurred can be identified by checking the indicators on the front of the CPU
Unit, or by using the CX-Programmer to check the error status.
The errors detected by the CPU Unit are listed in the following table.
Refer to 6-2 Troubleshooting Unit Errors for errors not detected by the CPU Unit.
: Not lit : Flashing : Lit
6-1-5 Types of Errors
• Error code storage word: The error code is stored in A400 when an error occurs.
• Error flags: Flags that indicate the type of error are allocated in the Auxiliary Area.
• Error information: There are words in the Auxiliary Area that provide specific information
on the meaning of error flags and information on the error location and
error details.
Error
POWER
RUN
ERR/
ALM
INH PRPHL BKUP
COM
(built-in
RS-232C
communi-
cations
status)
Error
code
(in A400)
Error
flag
Error
information
Opera-
tion
status
Error Word
Power supply error
Not lit Not lit Not lit Not lit Not lit
−
Not lit
−−−−
Opera-
tion
stops.
CPU standby error
Lit
Not lit Not lit
−−− − − − − −
Opera-
tion
stops.
CPU error (WDT
error)*1
Lit
Not lit
Lit
−−− − − − − −
Opera-
tion
stops.
Peripheral USB port
communications
error
Lit Lit
Not lit
−
Not lit
−− − − −−
Opera-
tion con-
tinues.
Builtin RS-232C port
communications
error
Lit Lit
Not lit
−−−
Not lit
−−−−
Opera-
tion con-
tinues.
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