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MELSEC-Q
5 PARAMETER SETTINGS
POINT
(1) Transient request processing may be prolonged in a system where transient
requests are made frequently (e.g. a system including a remote I/O station to
which a GOT is mounted).
In such a case, make the following setting.
(a) Parameter setting for the remote master station
Increase the value set in No. of transients.
Doing this enables concurrent execution of many transient requests (during
one scan).
(b) Setting on the remote master station (CPU module)
1) Execute the COM instruction.
Transient requests are processed when the remote master station
executes the COM instruction. (This is effective when the scan time of the
remote master station is long.)
2) Secure communication processing time.
In the END processing of the remote master station, the processing time
for transient requests is secured. (This is effective when the scan time is
short.)
• For the High Performance model QCPU, Process CPU, and
Redundant CPU, set it by the special register SD315.
• For the Universal model QCPU, set it by the service processing
setting of the PLC parameter (PLC system) of GX Developer.
Either of the above 1) or 2) can reduce the wait time for transient request
processing on the remote master station even if multiple remote I/O stations
issue transient requests.
(2) Although the above (1) can reduce the transient request processing time, it may
affect the process as described below.
Adjust each set value shown in (1) to a value suitable for the system being
used.
(a) Link scan time of MELSECNET/H
When transient requests are issued from multiple stations at the same time,
the link scan time may be temporarily prolonged.
(b) Scan time of the remote master station (CPU module)
The scan time may be prolonged by execution of the COM instruction or by
securing the communication processing time.
7) Link start instruction
For future expansion. Cannot be set at present time.