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5 INSTALLATION AND WIRING
5.7 Wiring
Precautions
• Wire cables of the programmable controller power supply, I/O power supply, and motor power supply separately as shown
below.
• Use an isolation transformer to reduce the noise such as the lightning surge. ( Page 175 Isolation transformer)
• Considering the rated current and inrush current of the power supply module, connect a breaker having the appropriate
sensing property or an external fuse causing proper blowout. When a single programmable controller is used, connecting a
breaker around 10A or an external fuse is recommended.
• Avoid connecting the 24VDC output of two or more power supply modules in parallel to supply power to one I/O module.
This parallel connection causes a breakdown of the power supply modules.
• Do not install 100VAC or 24VDC wires together with the main circuit lines (high voltage and large current) or I/O signal
wires (including common lines). Keep a distance of 100mm or more between them.
• A momentary power failure may be detected, or the CPU module or remote head module may be reset because of the
lightning surge noise. As a measure against the lightning surge noise, connect a surge absorber for lightning as shown
below. Using the surge absorber for lightning can reduce the influence from the lightning.
• Separate the ground of the surge absorber for lightning (E1) from that of a programmable controller (E2).
• Select a surge absorber for lightning which the power supply voltage does not exceed the maximum
allowable circuit voltage even when line voltage is maximum.
• There will be clearances between adjacent modules when the extended temperature range base unit is used, and therefore
care should be taken to ensure that cables do not pass between units at wiring.
100VAC
200VAC
T1
Programmable
controller power
supply
Isolation
transformer
Programmable
controller
Motor power supply
Motor
equipment
Main
power supply
I/O power supply
I/O equipment
Relay
terminal
block
Power supply module I/O modulePower supply module I/O module
External
power supply
24VDC
24VDC 24VDC
AC
E1
E2
Surge absorber for lightning
Programmable
controller
I/O equipment
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