Features - Mitsubishi Electric Q Series Reference Manual

1 OVERVIEW

1.2 Features

Refresh range
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The MELSECNET/H is designed to provide higher processing speed, more capacity,
and more functionality while maintaining the connectivity with the MELSECNET/10; it is
easier to use than ever in combination with GX Developer. Furthermore, the
MELSECNET/H has the following features that were not available with the conventional
MELSECNET (II) and MELSECNET/B data link systems.
(1) Achievement of a high-speed communication system
(a) The MELSECNET/H enables high-speed communications with 25Mbps and
10Mbps communication speeds. (25Mbps for only the QJ71LP21-25 and
QJ71LP21S-25 optical loop system)
(b) The link scan time has become even faster through the use of processors
specifically designed for linking.
(c) Refresh parameter area can be subdivided
By subdividing ranges with refresh parameters, refreshing of the areas not
used for the sequence program can be eliminated and the refresh time can
be reduced by refreshing only those required. (Refer to Section 5.7
"Refresh Parameters.")
• In the case of the High Performance model QCPU, Process CPU,
Redundant CPU, and Universal model QCPU, the refresh parameter
area of a network module can be divided into 64 (excluding SB and SW).
• In the case of the Basic model QCPU and safety CPU, the refresh
parameter area of a network module can be divided into 8 (excluding SB
and SW).
Also, because the bus speed between a QCPU and a network module has
been improved, the refresh time has been reduced.
QCPU
device (B)
(d) The optical loop system enables even faster levels of data communication
with multiplex transmission (refer to Multiplex Transmission Function in
section 7.6.)
Network module
link device (LB)
High-speed bus
Fragmentation
MELSEC-Q
Station
No. 1
(Host)
Each station's
Station
No. 2 total send range
Station
No. 3
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