Mitsubishi Electric Q172CPU User Manual download pdf (Page 156)

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4 INSTALLATION AND WIRING

(g) Wiring of 200m (656.17ft.) or more distance will give rise to leakage currents

due to the wiring capacity, resulting in a fault.

Refer to the troubleshooting chapter of the I/O Module User's Manual.

(3) Grounding

To ground the cable, follow the steps (a) to (c) shown below.

(a) Use the dedicated grounding as independent as possible.

(Ground resistance: 100

or less)

(b) When the Multiple CPU system and the another equipment cannot be

departed to ground the cable each other, use (2) Common Grounding

shown below.

Multiple CPU

system

Another

equipment

grounding

(1) Independent grounding.....Best (2) Common grounding.....Good (3) Joint grounding.....Not allowed

Another

equipment

Multiple CPU

system

Another

equipment

grounding

Multiple CPU

system

(c) Use the grounding cable of 2 mm

2

or more.

Position the ground-contact point as nearly to the Multiple CPU system as

possible, and use the total length of the grounding cable as short as

possible.

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