Siemens S5-100U - Page 56

Installation Guidelines S5-100U
Figure 3-20. Non-Grounded Operation; 24 V DC Power Supply
(with Safe Electrical Isolation According to DIN VDE 0160)
for Programmable Controller and I/Os
(1)
L+M
(2)
100 K
(8)
(6)
(7)
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PE
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Install the standard mounting
rail electrically isolated
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DI DO DO
1
2
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1
2
1
2
1 µF/
500
V AC
Interference voltages are discharged to the ground conductor (PE) via a capacitor. You can prevent
static charges by connecting a high-ohmic resistor (approx. 100 k / W) parallel to the capacitor.
3-24 EWA 4NEB 812 6120-02