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MELSEC-Q
1 OVERVIEW
(2) Large-scale and flexible system configuration
(a) The link device has a larger capacity: 16384 points for the link relay (LB)
and 16384 points for the link register (LW). (Refer to Section 3.1.1)
(b) The maximum number of link points per station has been increased.
By selecting the network type, the maximum number of link points per
station can be increased.
1) MELSECNET/H Extended mode
1
By selecting the MELSECNET/H Extended mode as the network type,
the maximum number of link points per station can be set up to 35840
bytes in excess of 2000 bytes.
It is not necessary to install multiple network modules for a single CPU
module to increase the number of transmission points.
2) MELSECNET/H mode
1
By selecting the MELSECNET/H mode as the network type, the
maximum number of link points per station can be set up to 2000 bytes.
Furthermore, by installing multiple network modules with the same
network number for the same CPU module, the link points of "number
of modules
maximum number of link points per station" can be sent.
(High Performance model QCPU, Process CPU, Redundant CPU, and
Universal model QCPU) (Refer to Section 7.9 "Increasing the Number
of Send Points by Installing Multiple Modules Having the Same
Network Number.")
1: The link scan time varies depending on the network type.
Refer to Section 3.3.2 for details.
(c) The commands for transmitting and receiving data with other stations on
the MELSECNET/H network system (SEND, RECV, RECVS, READ,
SREAD, WRITE, SWRITE) enable a maximum of 960 words of data to be
transmitted and received (refer to Programming in section 7.4.5.)
(d) A system can be expanded to contain a maximum of 239 networks. (Refer
to Section 2.1.4, "A Network System Containing Multiple Networks.")
(e) By using the inter-link data transfer function, data (LB/LW) can be transferred
to another network without creating a sequence program. (High Performance
model QCPU, Process CPU, Redundant CPU, and Universal model QCPU)
(Refer to Section 7.2, "Inter-link Data Transfer Function.")
Network No. 1
Network No. 2
Network
module
Network
module
3FFF
H
0
0
Inter-link data
transfer
LB LB
Q25HCPU
Network
module 1
Network
module 2
Data of network No. 2
Data of network No. 1
3FFF
H
Q25H
CPU
Q25H
CPU
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