System Configuration; Melsecnet/H Network Configurations; Single Network System - Mitsubishi Electric Q Series Reference Manual

2 SYSTEM CONFIGURATION

2 SYSTEM CONFIGURATION
This chapter explains different system configurations that are available with the
MELSECNET/H.

2.1 MELSECNET/H network configurations

This section describes network configurations available with the MELSECNET/H.

2.1.1 Single network system

A single network system is one system that connects the control station and the
normal stations with an optical fiber cable or a coaxial cable.
(1) Optical loop system
(2) Coaxial bus system
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In the optical loop system, 1 control station and 63 normal stations (a total of 64
stations) can be connected. Any station number can be assigned as the control
station. However, only one station can be set as the control station per system.
In the following sample system, station number 1 has been assigned as the
control station.
Station No.1 Station No. 2
(control station) (normal station)
QCPU QJ71 QCPU QJ71
LP21
In the coaxial bus system, 1 control station and 31 normal stations (a total of 32
stations) can be connected. As in the optical loop system, any station number
can be assigned as the control station. However, only 1 station can be assigned
as the control station per system.
Station No.1 Station No. 2
(control station) (normal station)
QCPU QJ71 QCPU
BR11
Terminal resistor
A6RCON-R75
POINT
A safety CPU operates as a normal station. (It cannot be set to a control station.)
Station No. 64
(normal station)
QCPU QJ71
LP21
Optical fiber cable
Station No. 32
(normal station)
QJ71 QCPU
BR11
Coaxial cable
MELSEC-Q
LP21
QJ71
BR11
Terminal resistor
A6RCON-R75
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