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6-2. How to Read Special Internal Relays(R) & Special Data Registers(DT)
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2. Table of Special Internal Relays(R)
The special internal relays are used for special purposes in the Programmable Controller.
Since these relays cannot be used as outputs, they should only be used.
WR900(Data Transfer instructions ; Error flags)
WR903(Data Transfer instructions ; Execution flags)
WR905(P/W Link ; Error flags)
Word number Address
Description
900
R9007
Turns ON(becomes “1”) and the ON status is maintained when data is specified in an
F145(SEND)/P145(PSEND) or an F146(RECV)/P146(PRECV) instruction.
The error program address is stored in DT9017.
R9008
Turns ON(becomes “1”) for an instant when data is specified in an
F145(SEND)/P145(PSEND) or an F146(RECV)/P146(PRECV)instruction.
The error program address is stored in DT9018.
Word number Address
Description
903
R9030
0 : When a Data Transfer instruction cannot be executed.
(including the period while a Data Transfer instruction is being executed.)
1 : When a Data Transfer instruction can be executed.
R9031
0 : When a Data Transfer operation is completed without error.
1 : When a Data Transfer error occurs. The error code is stored in DT9039.
Word number Address
Description
905
R9050
Turns ON,
•when a communication error occurs.
P/W Link 1 •when a station number(UNIT NO.) overlap occurs.
•when a PC Link send area overlap occurs.
R9051
Turns ON,
•when a communication error occurs.
P/W Link 2 •when a station number(UNIT NO.) overlap occurs.
•when a PC Link send area overlap occurs.
R9052
Turns ON,
•when a communication error occurs.
P/W Link 3 •when a station number(UNIT NO.) overlap occurs.
•when a PC Link send area overlap occurs.