Mitsubishi Electric MELSEC-Q Series User Manual page 180

(2) Functions
(a) Operation chart of the G(P).RIRD instruction
Master station
CPU module
Command
G(P).RIRD
Device
1.
The buffer memory specified by (S) + 2 and (S) + 3 of the station specified by (S) + 1, or the device
in a CPU module is accessed.
2.
The data that has been read is stored in the receive buffer of the master station.
3.
The data that has been read after the device specified by (D1) is stored, and the device specified
by (D2) turns on.
(b) Simultaneous execution of the G(P).RIRD instruction
The G(P).RIRD instruction can be simultaneously executed to multiple local stations, a standby master station,
or intelligent device stations from a master station.
However, concurrent execution of the instruction is not allowed to the same station. In addition, concurrent
execution of the instruction is not allowed to the different stations from local stations. (including other dedicated
instructions)
If the dedicated instruction is executed before the completion of the former dedicated instruction, the latter
instruction is ignored.
Because several scans are required to complete the process of the dedicated instruction, create a program so
that the next dedicated instruction is executed after Completion device (D2) turns on.
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Master station
3.
Receive buffer
Target station
Local station
1.
1.
Buffer memory
2.
2.
CPU module
Device