Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 27

1 OVERVIEW
GX Developer
Transient transmission
possible.
Q25H QJ71
CPU LP21
MELSECNET/H
No.8
1 - 6
(f) By installing multiple network modules, N:N communication (transient
transmission) with destination stations on eight network systems that use
the programmable controllers as relay stations can be performed using the
routing function.
(Refer to Section 7.4.2, "Routing Function.")
Transient transmission using the routing function can be performed not only
in a system composed of MELSECNET/H networks but also in a system
that contains CC-Link IE Controller Network, CC-Link IE Field Network
and/or MELSECNET/10 networks.
Q25H QJ71 Q25H QJ71
CPU CPU
LP21 LP21
MELSECNET/H
No.1
Q25H QJ71 QJ71
CPU LP21 LP21
MELSECNET/H
: Only the High Performance model QCPU, Process CPU, Redundant
CPU, and Universal model QCPU accept multiple network modules.
(g) The following three types of network systems can be configured
according to applications of each user.
1) Loop system that is more resistant to noise and provides longer distance
in total and between stations. (Up to 30km in total length)
2) Coaxial bus system that allows easier wiring (Up to 500m in total length)
3) Twisted bus system that allows the use of general-purpose cables (Up to
1200m in total length)
(Refer to Section 3.1, "Performance Specifications.")
(h) The following functions facilitate network connection:
1) Any station to be connected in the future can be specified as a reserved
station.
Specifying a station not actually connected as a reserved station
prevents a communication error. (Refer to Section 5.3.4 "Specification of
the reserved station.")
2) It is not necessary to connect stations in order of the station Nos. in the
network. (Refer to Section 4.2 "Part Names and Settings.")
Request destination
QJ71
LP21
No.2
MELSECNET/H
Q25H QJ71 QJ71
CPU LP21 LP21
MELSECNET/H
No.3
Q25H
CPU
MELSECNET/H
Q25H QJ71 QJ71
CPU LP21 LP21
No.7
Q25H QJ71 QJ71
CPU LP21 LP21
MELSECNET/H
QJ71 QJ71 Q25H QJ71
LP21 LP21 CPU LP21
MELSECNET/H
No.6 No.5
MELSEC-Q
No.4
Request
QJ71
source
LP21
1 - 6