85
Error Codes and Monitoring Section 7-2
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
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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