KEYENCE LK-G Series - Manual (Page 6)

4 LK-G-M-NO0-E
EMI: EN61326, class A
EMS: EN61326
Length of the power cord that is connected to the Controller, and length of all input/output
cords must be limited to shorter than 30 m.
Precautions for Wiring
Part of the circuits between the inputs and output are internal common. Make sure that a
potential difference does not occur between internal common terminals due to a potential
difference between wires or external devices. Otherwise, it may cause malfunctions in the
unit or external devices.
Examples of Wiring
LK-G3001V/LK-G3001(NPN type)
24 VDC (-), COM OUT (output COM), and COM IN (input COM) are all common via a
choke coil. Also, COM OUT and COM IN of the expansion connector are common via a
choke coil.
LK-G3001(V) LK-G3001(V)
COM OUT
COM IN
DC24V(+)
DC24V(-)
DC24V
COM OUT
COM IN
DC24V(+)
DC24V(-)
DC24V
The power supply (24 VDC) shorts via the
COM terminals, causing malfunctions.