507
8-4-3 Fatal Operating Errors
The following errors occur after program execution has been started. PC opera-
tion and program execution will stop and all outputs from the PC will be turned
OFF when any of the following errors occur.
None of the CPU indicators will be lit for the power interruption error, and only the
POWER indicator will be lit for the Expansion Rack power interruption error. The
POWER and WDT indicators will be lit for the CPU error. For all other fatal oper-
ating errors, the POWER and ERROR indicators will be lit. The RUN output will
be OFF.
Error and message Probable Cause Flag(s) Error code
(A400)
Possible remedy
Power interruption error A power interruption
longer than the
momentary power
interruption time has
occurred.
None None Check power supply voltage and
power lines. Try to power-up again.
Expansion Rack power
interruption error
A power interruption to an
Expansion Rack has
occurred.
None None Turn on the power supply to the
Expansion CPU and Expansion I/O
Racks.
CPU error Watchdog timer has
exceeded maximum
setting.
None 80FF Turn the power OFF and restart.
Memory error An error has occurred
during check of the PC,
Memory Card or EM Unit
memory, or program
transfer could not be
completed at start-up.
A40115 80F1 Check Memory Card and EM Unit
to make sure they are mounted and
backed up properly. Perform a
Program Check Operation to locate
cause of error. If error not
correctable, try inputting program
again.
I/O Bus error Error has occurred in the
bus line between the
CPU and I/O Units.
A40114 80C0 to 80C7
or 80CE or
80CF
1
Check cable connections between
the I/O Units and Racks. Verify that
terminators are connected, and
then clear the error. A404 contains
the errant rack/slot number.
Duplicate number error The same number has
been allocated to more
than one Expansion
Rack, more than one
CPU Bus Unit, or one I/O
word has been allocated
to more than one I/O Unit.
A40113 80E9 After checking the rack numbers,
unit numbers, or word allocation,
turn the relevant power supply ON,
OFF, and ON again, and then clear
the error. A409 contains the
duplicate rack number, and A410
contains the duplicate unit number.
CPU bus error Watchdog timer error has
occurred during data
transfer between the CPU
and CPU Bus Unit.
A40112 8100 to 8115
(indicate
Units 0 to 15)
Check cable connections between
the CPU and CPU Bus Units, and
then clear the error.
A405 contains the errant unit
number.
Too many I/O points Maximum number of I/O
points or I/O Units has
been exceeded in the I/O
Table.
A40111 80E1 Check the number of points with I/O
Table Read. If necessary, reduce
number of Units in the system to
keep within maximum number of
I/O points and register the I/O table
again.
2
Input-output I/O table error Input and output word
designations registered in
I/O table do no agree with
input/output words
required by Units actually
mounted.
A40110 80E0 Check the I/O table with I/O Table
Verification operation and check all
Units to see that they are in correct
configuration. When the system has
been confirmed, register the I/O
table again.
Program error END(001) is not written
anywhere in program or
the program exceeds
memory capacity.
A40109 80F0 Correct the program and then clear
the error.
Error Messages Section 8-4
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