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Errors Monitored with CPU
Section 11-2
IOWR instruction with the correct data and transfer the error clear com-
mand “EC” by executing the data transfer or IOWR instruction.
If an error has occurred when the IORD instruction is executed, transfer the
error clear command “EC” with the data transfer or IOWR instruction.
Error Clear with Data Transfer
To clear an error with data transfer, set the following data in the first word
of the data transfer area in the DM and execute data transfer.
Example: Unit 0 with Transfer Data “00EC”
Error Clear with IOWR Instruction
To clear an error with the IOWR instruction, set the control code of the first
operand of the IOWR instruction to “EC” and set the number of transfer
data blocks to 1. Then execute the IOWR instruction.
11-2 Errors Monitored with CPU
The following items can be monitored with the CPU of the PC.
11-2-1 Special I/O Unit Errors
DM 1003
DM 1004
DM 10000
to
(@)IOWR
#EC00
000
#0001
Item
Cause
Remedy
Special I/O Unit
malfunction
The PC does not start operating if
a Special I/O Unit mounted to the
PC has a fault in operation.
Replace the Special I/O Unit.
Only “$” will be indicated if the I/O table is read from a Special I/
O Unit that has a fault in operation.
I/O Unit Over
The PC does not start operating
and AR 25415 is turned ON if the
same unit number is allocated to
more than one Special I/O Unit.
Set so that each Special I/O Unit mounted to the PC has a
unique unit number.
The unit number of a Special I/O Unit can be checked by read-
ing the I/O table from the Special I/O Unit.
Special I/O Unit
abnormality
A special I/O Unit mounted to the
PC stops operating and AR 25415
is turned ON if the Special I/O Unit
has not been refreshed correctly
with the CPU.
Check the unit number of the Special I/O Unit with IR 28200 to
IR 28215 if the PC is a C200HE, C200HG, or C200HX or
AR 0000 to AR 0009, remedy the error, and with IR 28100 to IR
28115 if the PC is a C200HE, C200HG, or C200HX or AR 0100
to AR 0109, restart the Special I/O Unit by turning the Special I/
O Unit OFF, ON, and OFF. If the error persists after the Special
I/O Unit is restarted, replace the Special I/O Unit.
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