Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 56)

Publication 1760-UM002B-EN-P - March 2005
2-22 Installation
Figure 2.22 1760-IB12XOB8 with a diode on the inputs
Two-wire proximity switches have a residual current with the “0” state. If this
residual current is too high, the input may detect a “1” signal.
If inputs with a higher input current are required, an additional input circuit
must be used.
Increasing the Input Current
The following input circuit can be used in order to prevent interference and
also when using two-wire proximity switches:
Figure 2.23 Increasing the input current
L1
N
R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 E+ E– R11 R12 N N L
100-240 V
F1
L1
N
R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 E+ E– R11 R12 N N L
100-240 V
F1
100 nF/275 V h