Omron sysmac NX Series User Manual page 237

l Controller Ground Terminals
The Controller has the following ground terminal.
Grounding
type
Functional
Grounding
When the functional ground terminal is correctly grounded, it is generally effective in suppressing
power supply common noise. Occasionally, however, grounding this terminal will result in picking
up more noise, so be careful when using it.
NX-series Safety Control Unit/Communication Control Unit User's Manual (Z395)
Symbol
Ground this terminal when power supply noise causes malfunc-
tioning.
5 Installation and Wiring
Connection
5
5-71