Mitsubishi Q2ACPU User Manual page 313

19. LOADING AND INSTALLATION
(3)
CAUTION
PLC
(1) Independent grounding ... Best
Grounding
Always ground the FG and LG terminals to the protective ground conductor.
Failure to do so may cause an electric shock or malfunctions.
(a) Carry out the independent grounding if possible.
(b) If independent grounding is impossible, carry out the shared grounding (2) as
shown below.
Other
equipment
(2) Joint grounding ... Good
(c) Use the cable of 2mm
Set the grounding point closer to the PLC to make the grounding cable short as
possible.
(d) If any malfunction occurs due to grounding, disconnect either or both of the LG
and FG terminals of the base unit from the ground.
Other
PLC
equipment
2
or more for grounding.
19 - 21
Other
PLC
equipment
(3) Joint grounding ... Not allowed