
252
CPU Unit Error Indicators
Section 9-3
9-3
CPU Unit Error Indicators
The CPU Unit of the C200H/HS, C200HX/HG/HE, or CS1-series PC monitors
errors that occur in the ASCII Unit as described in this section. The errors are
indicated for the ASCII Unit as a Special I/O Unit.
9-3-1
Special I/O Unit Error List
Error
Error cause and operation
Remedy
Waiting for Special I/
O Unit startup
The program memory of the ASCII Unit is damaged
or there is a hardware fault at a Special I/O Unit.
The PC will not begin operation in this condition.
Perform the procedure for damage to the pro-
gram memory. If the Unit still will not restart,
replace the Special I/O Unit where the error
occurred.
The faulty Unit will be indicated by a “$
**
”
character in the I/O Table Read operation.
I/O Unit over
Two or more Special I/O Units have the same unit
number setting. The PC will not begin operation in
this condition.
The Special I/O Unit Error Flag (SR 25415) will be
ON.
Change the unit number settings to eliminate
duplications.
The unit numbers can be listed with the I/O
Table Read operation.
Special I/O Unit error Refreshing between the CPU Unit and Special I/O
Unit did not proceed normally. In this case, only the
faulty Unit won’t operate.
The Special I/O Unit Error Flag (SR 25415 for
C200H-family PCs; A40206 for CS1-series PCs)
will be ON.
With a C200H/HS PC, determine the unit
number of the faulty Unit from Error Flags
AR 0000 through AR 0009. Restart the Unit
by toggling the corresponding Restart Bit
(AR 0100 to AR 0109) after eliminating the
cause of the error.
With a C200HX/HG/HE PC, determine the
unit number of the faulty Unit from Error Flags
SR 28200 through SR 28215. Restart the
Unit by toggling the corresponding Restart Bit
(SR 28100 through SR 28115) after eliminat-
ing the cause of the error.
With a CS1-series PC, determine the unit
number of the faulty Unit from Error Flags
A41800 through A41815. Restart the Unit by
toggling the corresponding Restart Bit
(A50200 to A50215) after eliminating the
cause of the error.
If the Unit doesn’t restart after toggling the
Restart Bit, perform the procedure for dam-
age to the program memory. If the Unit still
will not restart, replace the Unit.
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