WIKA 851 - Manual (Page 11)

GB
2435182.03 12/2010 GB/D/F/E
WIKA operating instructions electronic contact, model 830 E 11
■ To connect a PLC control unit or for direct switching of small capacities
■ PNP transistor
With PNP switching apparatus, the switched output is a connection towards
PLUS. The load R
L
between the switched ouput and the MINUS should be
selected in a way not to exceed the maximum switching current of 100 mA.
Connection and function curcuit diagrams for electronic contact model 830 E,
control and switching electronics in the sensor, electrical connection via terminal
box
■ Flag emerges from slot sensor: Contact breaks
(output not active)
■ Flag retreats into slot sensor: Contact makes
(output active)
6. Commissioning, operation
2-wire system
With double contact
Measuring instrument
With double contact
PNP
PNP PNP
R
L
(load)
R
L
(load)
R
L
(2nd load)
PNP
R
L
(2nd load)
+U
B
-
2nd contact
2nd contact
+U
B
-
4
1
2
2
1
3
4
3-wire system
PLC Measuring instrument PLC