Grounding - Panasonic FP0R User Manual

Installation and wiring

5.4.1 Grounding

Risk of short circuits
70
If necessary, ground the instrument to increase the noise resistance.
For grounding purposes, use wiring with a minimum of 2mm

grounding connection should have a resistance of less than 100.
The point of grounding should be as close to the PLC as possible. The

ground wire should be as short as possible.
Always use an exclusive ground for PLCs and other devices. If two de-

vices share a single ground point, it may produce an adverse effect.
Q PLC
W Other device (inverter etc.)
Depending on the surroundings in which the equipment is used, grounding
may cause problems.
Example 1:
Since the power supply line of the FP0/FP0R expansion unit (24V DC and
0V terminal) is connected to the function earth through a varistor, the var-
istor may be shorted if there is an irregular potential between the power
supply line and function earth. (The power supply line of the FP0R is con-
nected to function earth through a high-voltage capacitor. Therefore, there
is no risk of a short-circuit.)
Power supply line of FP0R with built-in 39V varistor
Example 2:
Do not ground the function earth terminal of the FP0R when grounding a
plus terminal (+) of the power supply.
2
. The
FP0R User's Manual