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Error and message Possible correctionProbable causeFAL no.
SIOU ERR
Special I/O Unit error
D0 Error has occurred in PC
Link Unit, Remote I/O
Master Unit, between a
Host Link, SYSMAC LINK,
or SYSMAC NET Link Unit
and the CPU Unit, or in
refresh between Special I/O
Unit and the CPU Unit.
Determine the unit number
of the Unit which caused the
error (AR 00 or SR 282),
correct the error, and toggle
the appropriate Restart Bit
in AR 01, SR 250, or
SR 252. If the Unit does not
restart, replace it.
Battery error
BATT LOW
F7 Backup battery is missing or
its voltage has dropped.
Check battery, and replace
if necessary.
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 Unit indicators will be lit for the power interruption error. For all other fatal
operating errors, the POWER and ALM/ERR indicators will be lit. The RUN out-
put 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.
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 Unit
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 C3 Error has occurred in
the bus line between the
CPU Unit and I/O Units.
The rightmost digit of the FAL
number indicates the number of
the Rack where the error was
detected. Check the cable
connections between Racks.
Error Messages Section 9-4