Rockwell-automation 1760-xxxx Pico GFX-70 Controllers User Manual Uživatelský manuál stáhnout pdf (Strana 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

R10R9R8R7R6R5R4R3R2R1E+ E–

R11

R12 NNL

100-240 V

F1

L1

N

R10R9R8R7R6R5R4R3R2R1E+ E– R11 R12 NNL

100-240 V

F1

100 nF/275 V

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 399 400

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