F3 AIO 8/4 01 4 Start-Up
HI 800 161 E Rev. 1.01 Page 41 of 54
4.5 Connection Variants
This chapter describes the correct wiring of the remote I/O in safety-related applications.
4.5.1 Connecting Proximity Switches
Proximity switches can be evaluated with the analog inputs using the wiring shown in
Figure 10.
The proximity switch is connected to its supply via the line resistor RL. Afterwards, it is
connected in series to the R1 resistor.
Proximity Switch
Line Resistance of < 50
Z 7309 Shunt Adapter
R1 = 500
F3 AIO 8/4 01 Remote I/O
Supply
Analog Input
Ground
Figure 10: Proximity Switch on Analog Inputs
i
Unshielded cables may be used (zone A, in accordance with EN 61131 – 2: 2007).
Shielded cables must be used if the system is located in a hostile EMC environment (zone
B or C). The shielding must be earthed by attaching it to the shroud.
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