Rockwell Automation 1747-ACNR15 ControlNet Adapter Module User Manual - Manual (Page 103)

Publication 1747-UM003A-EN-P
Understanding Your SLC 500/1746 Control System B-11
This figure shows you how to run ground connections from the chassis to the
ground bus. Two acceptable grounding methods are shown; we recommend
using a ground bus because it reduces the electrical resistance at the
connection.
Master Control Relay
A hard-wired master control relay (supplied by user) provides a convenient
means for emergency shutdown. Since the master control relay allows the
placement of several Emergency-Stop switches in different locations, its
installation is important from a safety standpoint. Overtravel limit switches or
mushroom head push buttons are wired in series so that when any of them
opens, the master control relay is de-energized. This removes power to input
and output device circuits.
ATTENTION
!!!!
Never alter safety circuits to defeat their function, since
serious injury and/or machine damage could result.
2 mm
2
(14 AWG)
2 mm
2
(14 AWG)
2 mm
2
(14 AWG)
5.2 mm
2
(10 AWG)
Preferred Grounding
Method
5.2 mm
2
(10 AWG)
Earth Ground