Siemens SIMATIC S5-90U, Системное руководство

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S5-90U/S5-95U Installation Guidelines
Ungrounded Configuration of an S5-95U
Figure 3-28. Ungrounded Configuration: 24 V DC Power Supply (with Safe
Electrical Isolation According to VDE 0160) for Use with a
Programmable Controller and External I/Os
(1)
L+ M
(2)
100 K
(7)
(5)
(6)
1 µ F/
500 V AC
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DI DI DO DO
(3)
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PE
L1
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N
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M
Isolated standard
mounting rail
S5-95U
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(8)
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.
EWA 4NEB 812 6115-02b
3-29