5-2
Section
Self-diagnostic Functions
131
Message
Meaning and appropriate response
FAL No.
SCAN TIME OVER
F8
The cycle time has exceeded 100 ms. (SR 25309 will be ON.)
This indicates that the program cycle time is longer than recommended. Reduce cycle
time if possible. (The CPM2A can be set so that this error won’t be detected.)
Battery error
(no message)
F7
If the voltage of the CPM2A-BAT01 backup battery is below the minimum level, the
ERR/ALM indicator will flash and SR 25308 will be turned ON.
Replace the battery. (See
5-7 Battery Replacement
for details.)
5-2-4 Fatal Errors
PC operation and program execution will stop and all outputs from the PC will be
turned OFF when any of these errors have occurred. CPM2A operation can’t be
restarted until the PC is turned off and then on again or a Programming Device is
used to switch the PC to PROGRAM mode and clear the fatal error.
All CPU Unit indicators will be OFF for the power interruption error. For all other
fatal operating errors, the POWER and ERR/ALM indicators will be lit. The RUN
indicator will be OFF.
Message
FALS
No.
Meaning and appropriate response
Power interruption
(no message)
None
Power has been interrupted for more than 10 ms (2 ms for DC power types.)
Check power supply voltage and power lines. Try to power-up again.
MEMORY ERR
F1
AR 1308 ON: There is a non-existent bit or word address in the user program. Check
the program and correct errors.
AR 1309 ON: An error has occurred in flash memory. Replace the CPU Unit.
AR 1310 ON: A checksum error has occurred in read-only DM (DM 6144 to DM 6599).
Check and correct the settings in the read-only DM area.
AR 1311 ON: A checksum error has occurred in the PC Setup. Initialize the PC Setup
and input the settings again.
AR 1312 ON: A checksum error has occurred in the program. Check the program and
correct any errors detected.
AR 1313 ON: A checksum error has occurred in the expansion instructions data and all
function codes have been set the their default values. Reset the expansion
instructions.
AR 1314 ON: Data was not maintained in an area specified for holding. Clear the error,
check the data in the areas specified for holding, and try again.
NO END INST
F0
END(01) is not written in the program. Write END(01) at the end of the program.
I/O BUS ERR
C0
An error has occurred during data transfer between the CPU Unit and an Expansion
Unit or an Expansion I/O Unit. Check the Unit’s connecting cable.
I/O UNIT OVER
E1
Too many Expansion Units or Expansion I/O Units have been connected. Check the
Unit configuration.
SYS FAIL FALS**
(** is 01 to 99 or 9F.)
01 to 99 A FALS(07) instruction has been executed in the program. Check the FALS number to
determine the conditions that caused execution, correct the cause, and clear the error.
9F
The cycle time has exceeded the Maximum (Watch) Cycle Time setting (DM 6618).
Check the cycle time and adjust the Maximum Cycle Time setting if necessary.
5-2-5 Communications Errors
The COMM indicator will be turned OFF and AR 0812 will be turned ON if an
error occurs in communications through the peripheral port or AR 0804 will be
turned ON if an error occurs in communications through the RS-232C port.
Check the connecting cables and restart.
There are no error messages or error codes generated by this error and the
ERR/ALM indicator is not affected.
