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Error Codes and Monitoring
Error Codes and SR/AR
Bits
Master Error Flags and
Restart Bits
Unit Number and Word
Error Information Before
Operation
Slaves
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The Error Check bit can be turned ON and OFF to read errors when they
have occurred in more than one Unit. The Remote I/O Error flag indicates
that an error has occurred in a Remote I/O Slave Unit or Remote Terminal.
When a remote I/O error has occurred, bit 25312 also turns ON.
Whenever an error listed in the C200H table under 7-1 Self-Diagnosis oc-
curs, error information can be accessed in the following SR and AR bits and
words.
Word/bit
Information
AR 0014/0015
Unit number of Master with error.
AR 02
Unit number of Slave with error at beginning
of operations
AR 03 to AR 06
Word number of Remote Terminal with error
at beginning of operations.
SR 251
Unit number or word number of unit with error
after beginning of operations.
Error flags and Restart bits for Masters are listed below. Restart bits can be
turned ON and then OFF to restart a Master after first removing the cause of
the error. Error flags are ON when an error has occurred.
Bit
Function
AR 0014
Master #1 Error flag
AR 0015
Master #0 Error flag
AR 0114
Master #1 Restart bit
AR 0115
Master #0 Restart bit
The following bits can be used for error processing and debugging when es-
tablishing a new system.
The following Error flags will be turned on when the same unit number has
been set for two different Slaves.
Bit
Function
AR 0200
Unit #0 Error flag
AR 0201
Unit #1 Error flag
AR 0202
Unit #2 Error flag
AR 0203
Unit #3 Error flag
AR 0204
Unit #4 Error flag
Section 7-2
85
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