Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 37

2 SYSTEM CONFIGURATION
(3)
Station No.1
(control station)
QCPU
2 - 2
Twisted bus system
In the twisted bus system, 1 control station and 31 normal stations (a total of 32
stations) can be connected.
Any station number can be assigned as the control station.
Note that, only 1 station can be assigned as the control station per system.
Station No.2
(normal station)
QJ71
QCPU
NT11B
Terminating
resistor
Twisted pair cable or CC-Link Ver.1.10-compatible cable
POINT
A safety CPU operates as a normal station. (It cannot be set to a control station.)
Station No.32
(normal station)
QJ71
QJ71
QCPU
NT11B
NT11B
MELSEC-Q
Terminating
resistor
2 - 2
2