Omron SYSMAC C Series

Installing the C20
Noise-suppression measures
i Be sure to take appropriate noise-suppression measures when any
1 | i electrical device likely to produce noise is employed as a PC output load.
For example, electromagnetic relays and valves generating noise of more
than 1,200V require noise suppression.
Surge
suppressor For AC-supplied noise sources, connect a surge suppressor in parallel
with the coil of each device. For DC-operated noise sources, connecta
AC power source diode in parallel with the coil of each device.
When mounting a CPU and I/O expansion unit in a contro! panel, be sure
to completely ground the intermediate mounting plate. The mounting
plate must be finished with high-conductivity plating to insure noise
immunity.
Power supply
Where possible, use independent power sources for the input, the load,
and for the CPU and |/O units.
© DC power source
Input
power
supply
External
power
Load power supply
=
Cain |
aes Se
Input device ) Output device | Input device Output device
C20 CPU Expansion I/O unit
ty
p--i-L--
\ Power supply f
DC 24V/AC 100 to 120V/AC 200 to 240V
Grounding
Terminal LG is a noise filter neutral terminal which does not normally
require grounding. When electrica! noise is a problem, however, this
terminal should be short circuited with terminal FG.