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G1 Introduction to AC500 1-54 AC500 / Issued: 07.2006
Displaying error messages (error codes) on the AC500 CPU
When an error occurs, the red error LED goes on and an error message is displayed in the LC Display.
By pressing the DIAG key, the complete error code can be shown and an acknowledgement of the error
can be performed.
ETH
FBP
COM1
COM2
PWR RUN ERR
RUN DIAG
VAL CFG
ESC
OK
PM581
INSERT
PUSH
MC
502
SYS
BATT
I/O-Bus
CPU
24 V DC 10 W
WARNING!
Use of
incorrect
battery may
cause fire or
explosion.
By using the DIAG and
the OK or the ESC push-
buttons, the error mes-
sage/code can be dis-
played and the error can
be acknowledged.
DIAG OK ESC
Figure: Error display on the CPU
The AC500 CPU can display various errors according to the error classes. The following error classes
are possible. The reaction of the CPU is different for each type of error.
Error class Type Meaning Example
E1 Fatal error A safe function of the operating system
is no longer guaranteed.
Checksum error in the
system Flash or RAM error
E2 Severe error The operating system is functioning
without problems, but the error-free
processing of the user program is no
longer guaranteed.
Checksum error in the
user Flash, independent of
the task duration
E3 Light error It depends on the application, if the user
program should be stopped by the
operating system or not. The user
should decide, which reaction is
necessary.
Flash could not be
programmed, I/O module
has failed.
E4 Warning Error in the periphery (e.g. I/O) which
only can have influence in the future.
The user should decide the reaction to
provide.
Short-circuit at an I/O
module, the battery is
exhausted or not inserted.
Note: The error messages are displayed as error codes using the Control Builder software (via
PLC browser). Errors are displayed as text in the status line of the Control Builder software or with
function blocks for diagnosis.
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