Features - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

1 OVERVIEW

1.2 Features

Item
Link device transfer
SB/SW transfer
Refresh range
1 - 4
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.
Communication speeds vary depending on the network system.
Network system
Optical loop
Coaxial bus
Twisted bus
1: QJ71LP21-25 and QJ71LP21S-25 only
(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 refresh parameter ranges, 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.")
The number of refresh parameter settings per module is shown below.
Q00UJCPU
Basic model QCPU
Q00UCPU
Safety CPU
Q01UCPU
8
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.)
10Mbps or 25Mbps
10Mbps
156kbps to 10Mbps
Number of settings
High Performance model QCPU
Universal model QCPU other than listed in the left column.
16
1 for each
Network module
link device (LB)
High-speed bus
Fragmentation
MELSEC-Q
Communication speed
1
Process CPU
Redundant CPU
64
Station
No. 1
(Host)
Each station's
Station
No. 2 total send range
Station
No. 3
1 - 4