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F3 AIO 8/4 01
4 Start-up
HI 800 161 E Rev. 2.00
Page 41 of 56
4.5
Connection Variants
This chapter describes the permissible wiring of the remote I/O in safety-related applications.
Only the connection variants specified here are permitted for SIL 3 applications.
4.5.1
Connecting Proximity Switches
Proximity switches are connected to the analog inputs using the Z 7309 shunt adapter, see
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.
RL/2
RL/2
RL/2
RL/2
Proximity Switch
Line Resistance of < 50
Ω
Z 7309 Shunt Adapter
R1 = 500
Ω
within the Shunt Adapter
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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