Mitsubishi QJ71MB91, User Manual

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10
- 9 10.2 Z(P).MBRW
10
DEDICATED INSTRUCTIONS
(f) When using the automatic communication function and the MBRW instruction on
the same channel
The MBRW instruction is not executed while the Response monitoring timer/
Broadcast delay of the automatic communication function is active.
When the automatic communication function and the MBRW instruction are used
on the same channel, set appropriate automatic communication parameters and
create a proper sequence program so that the MBRW instruction can executed in
the right timing.(
Section 9.2.3)
(g) Confirmation of execution status
Whether the MBRW instruction is being executed, or completed normally or not
can be checked by the MODBUS exception code ((S1)+2), the completion
device (D2) specified as set data, and the error completion device ((D2)+1).
The completion device (D2) turns ON in the END processing of the scan after
completion of the MBRW instruction, and turns OFF in the next END processing.
The error completion device ((D2)+1) turns ON in the END processing of the scan
after error completion of the MBRW instruction, and turns OFF in the next END
processing. (The device remains OFF in the case of normal completion.)
Figure 10.2 MBRW instruction timing chart
OFF
ON
Completion of MBRW
instruction execution
Normal
completion
OFF
OFF
ON
END processing END processing END processing END processing
ON Error
completion
Completion device (D2)
Error completion device
(D2)+1
1 scan
MBRW instruction
Sequence program