Mitsubishi Electric MELSEC iQ-R Series User Manual page 94

■Operation during sending when multiple items are set for "Number Of Transaction Queues
For PLC Transmission"
Messages of the number of specified by "Number of Transaction Queues For PLC Transaction" are interleaved
(accumulated).
In the case of interleaved messages, the number configured by "Number of Multi-Transaction Queues For PLC Transmission"
for each transaction is sent. (Messages are sent one by one when "Number of Multi-Transaction Queues For PLC
Transmission" has been set to "1".)
Programmable
controller CPU
Transmission request
relay A on
Transmission request
relay B on
Transmission request
relay C on
Receive
notification A
detection
Precautions
If the Number of Transaction Queues For PLC Transaction becomes full, sending fails and later messages are discarded.
7 BASIC FUNCTIONS
92
7.7 Option Setting
Device
Receive notification A
Thereafter the
sequence will be
repeated.
SECS/GEM communication
software
Transmission
requests
A, B, and C
detection
Primary A
Secondary A
Primary B
Secondary B
Host
The transmission
messages, A, B, and C,
are acquired and put on
the queue.