Chapter 4 Installation and Wiring
4-89
Two-wire Proximity Switch
Please use the two-wire proximity switch whose leakage current I
L
is less than 1.5 mA when the switch is OFF. If the
leakage current is larger than 1.5 mA, please connect the divider resistance Rb gotten from the formula below.
(k Ω)
NPN(Sink)
S/S
X0.0
I/O
Rb
IL
24VDC
Two-wire proximity switch
Internal
circuit
PNP(Source)
S/S
X0.0
I/O
Rb
IL
24VDC
Internal
circuit
Two-wire proximity switch
Three-wire Switch
NPN(Sink)
Three-wire switch
S/S
X0.0
I/O
24VDC
Internal
circuit
PNP(Source)
S/S
X0.0
I/O
24VDC
Internal
circuit
Three-wire switch