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Troubleshooting
CPU error
• The Special I/O Unit is defective.
CPU waiting
• The PC hasn't begun to run.
• One unit number has been assigned to more than
I/O Unit Over error
• SR 25415 will be turned ON and the PC won't oper-
• An error has occurred in I/O refreshing between the
Special I/O Unit error
• SR 25415 will be turned ON but PC operation will
Special I/O Unit Error Detection Bit (SR)
Bit
25415
Duplicated unit number
Special I/O Unit error
Special I/O Unit Error Flags (AR)
Bit
AR 0000
AR 0001
AR 0002
AR 0003
AR 0004
AR 0005
AR 0006
AR 0007
AR 0008
AR 0009
Probable causes and operations
one Special I/O Unit.
ate when an "I/O Unit Over error" occurs.
Flags AR 0000 to AR 0011 indicate the duplicated
unit number.
CPU and the Special I/O Unit.
continue when a "Special I/O Unit error" occurs.
Error
One number is assigned to more
than one Special I/O Unit.
An error has occurred in the refresh
signal between the CPU and the
Special I/O Unit
Item
Unit #0 Error Flag
Unit #1 Error Flag
Unit #2 Error Flag
Unit #3 Error Flag
Unit #4 Error Flag
Unit #5 Error Flag
Unit #6 Error Flag
Unit #7 Error Flag
Unit #8 Error Flag
Unit #9 Error Flag
Note SR 28200 to SR 28215 can also be used for unit numbers 0 to 15 for the
C200HX/HG/HE.
• Replace the defective Special I/O Unit.
• The defective Unit should appear as $
signs only in the I/O table read opera-
tion.
Do not assign the same number to more
than one Unit. Use the I/O table read
operation to display unit numbers.
Check AR 0000 to AR 0015 for the unit
number of the Unit in error. After
correcting the error, restart the Unit by
toggling the corresponding restart bit
(OFF→ ON → OFF) in AR 0100 to
AR 0109. If the error recurs after
restarting the Unit, replace the Unit.
Explanation
When one of the CPU errors described above
occurs, the AR bit turns ON for the Unit where the
h AR bi
error occurred
error occurred.
Section 3-3
Possible remedies
Operation status
PC operation stops.
Operation stops only for the faulty
Unit.
Function
ON f
h U i
h
h
43
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