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Fatal Operating Errors The following error messages appear for errors that occur after program execu-
tion has been started. PC operation and program execution will stop and all out-
puts from the PC will be turned OFF when any of the following errors occur. No
CPU indicators will be lit for the power interruption error. For all other fatal oper-
ating errors, the POWER and ALM/ERR indicators will be lit. The RUN output will
be OFF.
Error and message FAL no. Probable cause Possible correction
Power interruption
No message.
None Power has been
interrupted for at least
10 ms.
Check power supply voltage
and power lines. Try to
power-up again.
No message.
CPU error
None Watchdog timer has
exceeded maximum
setting (default setting:
130 ms).
Restart system in PROGRAM
mode and check program.
Reduce cycle time or reset
watchdog timer if longer time
required. (Consider effects of
longer cycle time before
resetting.)
Memory error
MEMORY ERR
F1
SR 27211 ON:
A checksum error has
occurred in the PC
Setup (DM 6600 to
DM 6655).
Check the PC Setup.
SR 27212 ON:
A checksum error has
occurred in the program,
indicating an incorrect
instruction.
Check the program.
SR 27213 ON
A checksum error has
occurred in an
expansion instruction
change.
SR 27214 ON:
Memory Cassette was
installed or removed
with the power on.
Install the Memory Cassette
correctly.
SR 27215 ON:
Autoboot error.
Check whether the CPU
memory is protected or a
checksum error occurred in the
Memory Cassette.
No END(01) instruction
NO END INST
F0 END(01) is not written
anywhere in program.
Write END(01) at the final
address of the program.
I/O bus error
I/O BUS ERR
Rack no.
*
C0 to C2 Error has occurred in
the bus line between the
CPU and I/O Units.
The rightmost digit of the FAL
number will indicate the number
of the Rack where the error was
detected. Check cable
connections between the
Racks.
Error Messages Section 10-4