5-10
5.2.2 Grounding
In situations of excess noise
Under normal conditions, the inherent noise resistance is sufficient. However, in situations of excess
noise, ground the instrument to increase noise suppression.
Exclusive grounding
•
The grounding connection should have a resistance of less than 100
Ω
.
•
The point of grounding should be as close to the PLC unit as possible. The ground wire should be as
short as possible.
•
If two devices share a single ground point, it may produce an adverse effect. Always use an exclusive
ground for each device.
Note:
Depending on the surroundings in which the equipment is used, grounding may cause problems.
[Example]
Since the power supply line of the FP
Σ
power supply connector is connected to the function earth
through a varistor, if there is an irregular potential between the power supply line and earth, the varistor
may be shorted.
Do not ground the FP
Σ
function earth terminal when grounding a plus (+) terminal of the power.
In some computers, the SG terminal of RS232C port and connector shieldingare connected. Also the
FP
Σ
tool port shielding is connected with the function earth terminal. Therefore, the GND terminal of FP
Σ
and the function earth terminal are connected if the computer is connected. Especially when the FP
Σ
is
connected to a computer with a plus (+) terminal grounded, therefore, an FP
Σ
’s minus (-) terminal is
connected with the function earth terminal. As a result, short circuit occurs which may lead to the
breakage of FP
Σ
and its neighboring parts.
Содержание FP E Series
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