
5. PROCEDURES BEFORE SYSTEM OPERATION
MELSEC-A
5-8
5.5.3
Precautions against wiring
As one of the requirements to give full play to AJ71PB92D/A1SJ71PB92D’s functions and make up
the system with high reliability, it is necessary to have an external wiring unsusceptible to an influence
of noise. Precautions against external wiring of AJ71PB92D/A1SJ71PB92D is described below.
(1)
Do not route the wire of AJ71PB92D/A1SJ71PB92D close to or bundle it together with the
main circuit and high-tension lines, or the load-carrying lines from other than the PLC.
Otherwise, the module may be susceptible to an influence of noise and surge induction.
(2)
Keep the wires from the input/output modules of the PLC away from the communication
cable as much as possible as shown below.
Shield twisted-pair cable
Wiring of input
module
Wiring of output module
Shielded covering
Pow
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r s
upp
ly
modul
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P
L
C CP
U
Inpu
t m
o
du
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Inpu
t m
o
du
le
O
u
tput modul
e
O
u
tput modul
e
AJ71PB
92D/
A1SJ71
PB92D