Hitachi HSC-2100 Hardware Manual page 36

(11) Grounding
Check the wiring for grounding.
• Make sure that the grounding line is not shared with any other piece of equipment.
• Make sure that the grounding point is at least 15 meters away from that of the AC panel.
Check, also, that no power cable or lead cable (e.g., a motor lead cable) is placed near signal
cables, such as a remote I/O cable.
I/O unit
Grounding line shared
Construct an emergency stop circuit and an interlock circuit outside the
programmable controller. Unless they are so constructed, failure of the
product may result in machine breakdown or accident.
Keep the input/output currents of I/O modules within the maximum permitted
current values. If an overcurrent is allowed to flow in the I/O module, the
component part(s) involved may be damaged, resulting an accident, fire, or
product failure.
Do not use a transceiver, cellular phone, or the like near the I/O module.
Such communication equipment generates noise, which may result in malfunction
or system failure.
Other piece
of equipment
NOTICE
NOTICE
1 GENERAL INFORMATION
I/O unit
Separate grounding line
installed for the other piece
1-13
Other piece
of equipment