Mitsubishi QJ71E71-100 - Page 195

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MELSEC-Q
6 DEDICATED INSTRUCTIONS
[Operation of the local station when the SREAD instruction is being executed]
OFF
ON
OFF
ON
OFF
OFF
ON
ON
Sequence program
SREAD instruction
SREAD instruction execution
is completed
END
processing
Send/receive
direction flag
Completion device
Status display device
at completion
Abnormal
completion
Normal
completion
One scan
END
processing
END
processing
END
processing
[Operation of the other station when the SREAD instruction is being executed]
Completion of send of
device data designated with
the SREAD instruction.
OFF
ON
Sequence program
END
processing
Completion device
END
processing
END
processing
END
processing
(5) When the instruction is executed using J.SREAD/G.SREAD, the next read
processing is executed in succession after one read processing is completed
while the read command is on.
When the instruction is executed using JP.SREAD/GP.SREAD, the read
processing is executed only once when the read command switches from off to on
(at rise).
Errors
(1) When a dedicated instruction ends with an error, the abnormal completion signal
(D2) + 1 turns on and the error code is stored in the completion status (S1) + 1.
See the following manuals regarding the error code, check the errors and take
corrective actions.
<Error codes>
4FFF
H
or less : QCPU (Q Mode) User's Manual (Hardware Design, Maintenance
and Inspection)
C000
H
or higher: Section 11.3.3 of the Q Corresponding Ethernet Interface
Module User's Manual (Basic)
Program example
See the program example of the READ instruction described in Section 6.4.
The SREAD instruction only differs from the READ instruction on one point, namely
that the read notification device (D3) is designated at the end of arguments.