Mitsubishi Electric Q173CPU User Manual page 156

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
(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.
Another
Multiple CPU
equipment
system
grounding
(1) Independent grounding.....Best
(c) Use the grounding cable of 2 mm
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.
or less)
Another
Multiple CPU
equipment
system
grounding
(2) Common grounding.....Good
2
or more.
4 - 17
Another
Multiple CPU
equipment
system
(3) Joint grounding.....Not allowed