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(b) Use a power supply which generates minimal noise between wires and
between the PLC and ground. If excessive noise is generated, connect
an insulating transformer.
Insulating
transformer
(c) When a power transformer or insulating transformer is employed to
reduce the voltage from 200 VAC to 100 VAC, use one with a capacity
greater than those indicated in the following table.
Power Supply Module
A61P, A61PN
A62P
A65P
A66P
(d) Provide separate wiring systems for the PLC power, I/O devices, and
operating devices as shown below.
If the wiring is influenced by excessive noise, connect an isolation
transformer.
(e) Taking rated current or inrush current into consideration when wiring
the power supply, be sure to connect a breaker or an external fuse that
have proper blown and detection.
When using a single PLC, a 10A breaker or an external fuse are
recommended for wiring protection.
Main
power supply
200VAC
On a control panel
REMARK
As safety measures, install a switch for use with "online I/O module
change" only to each of the corresponding modules and equipment.
(f) Note on using the 24 VDC output of the A62P, A65P and A66P power
supply module.
CAUTION
PLC
Transformer Capacity
160VA
155VA
110VA
95VA
PLC
power supply
Relay
terminal
block
I/O power supply
Main circuit
power supply
Do not connect multiple power supply modules to one
module in parallel. The power supply modules may be
heated, resulting in a fire or failure.
42
Insulating
transformer
n
n: Stands for the number of power
n
supply modules.
n
n
Insulation
Transformer
PLC
T1
I/O equipment
Main circuit equipment
I/O
equipment
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