5. PROCEDURES BEFORE SYSTEM OPERATION
MELSEC-A
5-9
(3) Grounding
(a) When the PROFIBUS-FMS interface module is used, the FG and LG terminals of the power
supply module of the PC should basically be grounded.
(b) If communication cannot be performed after grounding because of abnormal voltage applied
to the FG terminal, the module may be used without grounding.