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6 WIRING
6.3 Grounding
■Tool
<Reference>
6.3 Grounding
Perform the following.
• Perform class D grounding (Grounding resistance: 100 or less).
• Ground the PLC independently when possible.
• If the PLC cannot be grounded independently, perform the "Common grounding" shown below.
PLC extension devices (excluding expansion boards and communication adapters)
• Use a grounding wire with thickness of AWG 14 (2 mm
2
) or thicker.
• Locate the ground point as close to the PLC as possible to minimize the length of the grounding wire.
For tightening terminals, use a small, commercially-available screwdriver with a straight tip. The recommended
shape is shown in the figure on the right.
■Precautions
When a precision screwdriver with a small grip is used, the specified tightening torque cannot be obtained. Use
the following screwdriver or equivalent product (grip diameter: 25 mm (0.99")) to obtain the tightening torque
specified above.
Manufacturer Model
Phoenix Contact GmbH & Co. KG SZS 0.42.5
0.4 mm 2.5 mm
With straight tip
(0.01") (0.09")
PLC PLC PLC
Other
equipment
Other
equipment
Other
equipment
Independent grounding
(Best condition)
Shared grounding
(Good condition)
Common grounding
(Not allowed)
PLC
Intelligent
module
Independent grounding
class D grounding (grounding resistance: 100 or less)
Expansion
adapter
Expansion
board
CPU
module
I/O
module
Other
equipment