155
Error and message
Scan time overrun
Battery error
Probable cause
Watchdog timer has ex-
ceeded 100 ms.
Backup battery is miss-
ing or it’s voltage has
dropped.
Possible correction
Program scan time is longer
then desirable. Reduce scan
time if possible.
Check battery and replace if
necessary.
The following error messages appear for errors that occur after program exe-
cution has been started. PC operation and program execution will stop and
all outputs from the PC will be turned OFF when any of the following errors
occur. All CPU indicators will not be lit for the power interruption error. For all
other fatal operating errors, the POWER, and ERR indicators will be lit and
the RUN indicator will not be lit. The RUN output will be OFF.
Error and message
Power interruption
No message
CPU error
No message
Memory error
No END(01) instruction
I/O bus error
Probable cause
Power has been inter-
rupted for at least 10 ms.
Watchdog timer has ex-
ceeded maximum setting
(default setting: 130 ms).
Memory Unit is incor-
rectly mounted or miss-
ing or parity error has oc-
curred.
END(01) is not written
anywhere in program.
Error has occurred in the
bus line between the
CPU and Units.
Possible correction
Check power supply voltage and
power lines. Try to power-up
again.
Restart system in PROGRAM
mode and check program. Re-
duce scan time or reset watch-
dog timer if longer time required.
(Consider effects of longer scan
time before resetting).
Check Memory Unit to make sure
it is mounted and backed up
properly. Perform a Program
Check Operation to locate cause
of error. If error not correctable,
try inputting program again.
Write END(01) at the final ad-
dress of the program.
Check the CPU Left/Right selec-
tor switch on the Expansion I/O
Unit. Check cable connections
between the Units and Racks.
Fatal Operating Errors
Error Messages Section 8–3
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