Wiring Of Power Supply; General Precautions; Grounding - Panasonic FP-XH M8N16PD User Manual

5.2 Wiring of Power Supply

5.2.1 General Precautions

 Power supply selection
• Please use a power supply with less interference whenever possible.
• Although overlap in the power line interference has sufficient interference tolerance, but we
still recommend using the insulated transformer / insulated power supply for further
interference attenuation.
 Isolation of power supply systems
Please separate wires for the unit, input and output device, and power equipment.
Circuit breaker
Insulation converter
Insulated DC power supply
 Power sequence
• Take the power sequence into consideration and cut off the PLC power supply before the
power supply for input and output is shut off.
• If the input and output power is shut off before cutting off the PLC power supply, the control
unit may sometimes detect the change of the input value and cause an unexpected
sequence of actions.

5.2.2 Grounding

• To obtain adequate anti-interference performance, please make sure the power supply is
grounded.
• Grounding location shall be as close as possible to the PLC to shorten the length of the
grounding wire.
• When used in common with other devices, it can sometimes lead to an opposite effect, so
dedicated grounding must be used.
CORRECT
Grounding at the grounding
resistance of 100Ω or lower
Interter and
PLC
other equipment
Power
equipment
Input / output
device
P LC
INCORRECT
PLC
5.2 Wiring of Power Supply
Interter and
other equipment
5-3