Mitsubishi Electric Melsec Q Series User Manual page 189

6 DEDICATED INSTRUCTIONS
[Local station]
Programmable
controller CPU
(D1)
[Operation of the local station when the RECV instruction is being executed]
Sequence program
RECV instruction
RECV instruction
execution request
(buffer memory
address: 205)
Completion device (D2)
Status display device
at completion (D2) + 1
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Ethernet module
Channel 1
RECV
Channel n
Channel 8
(2) The instructions for Ethernet module cannot be executed to two or more locations
for the same channel.
If the execution conditions are met at two or more locations at the same time,
instructions to be executed later have to wait until the channel becomes available
because handshaking is automatically performed at the execution of the first
instruction.
(3) RECVS instruction (for interrupt program) cannot be used with the instruction for
data link in cases where the same channel is used to read receive data using the
instruction for data link.
(4) Whether the RECV instruction is being executed or has been completed normally
or abnormally can be checked with the completion device (D2) or completion
status display flag ((D2) + 1) designated in the set data.
(a) Completion device (D2)
Turns on at the END processing of the scan where the RECV instruction is
completed, and turns off at the next END processing.
(b) Status display device at completion ((D2) + 1)
Turns on and off depending on the completion status of the RECV instruction.
Normal completion: Stays off and does not change.
Abnormal completion: Turns on at the END processing of the scan where
END END
processing processing
ON
OFF
ON
OFF
OFF
OFF
(5) When executing the instruction using JP.RECV/GP.RECV, the read processing is
executed only once when the read instruction flag goes from off to on (at rise).
[Response station]
Programmable
controller CPU
(D1)
SEND
Ethernet
the RECV instruction is completed, and turns off at
the next END processing.
RECV instruction
execution is completed
MELSEC-Q/L
Ethernet module
Channel 1
(S)+2
Channel n
Channel 8
END END
processing processing
ON
Abnormal
ON
completion
Normal
completion
One scan
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