Delta AS Series Operation Manual page 214

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4.8.1.3 Open-collector Input Type

Sinking
(NPN transistor whose collector is open)

Sourcing
(PNP transistor whose collector is open)
4.8.1.4 Two-wire Proximity Switch
Use the two-wire proximity switch whose leakage current I
leakage current is larger than 1.5 mA, connect the divider resistance Rb using the formula below.
6
≤
Rb
1 5 .
−
IL

Sinking
Two-wire proximity switch
I/O
24VDC
NPN
I/O
+Vcc
0V
24VDC
PNP
(k Ω)
I/O
IL
X0.0
Rb
S/S
24VDC
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X0.0
S/S
X0.0
S/S
is less than 1.5 mA when the switch is OFF. If the
L
Internal
circuit
Internal
circuit
Internal
circuit