Siemens SIMATIC ET 200S Operating Instructions Manual page 151
Distributed i/o system
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Also See for SIMATIC ET 200S:
- Manual (652 pages) ,
- Operating instructions manual (418 pages) ,
- Hardware installation and operating manual (216 pages)
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Wiring of DC-operated coils
The figure below shows DC-operated coils wired with diode or Zener diode circuits
①
②
Diode/Zener diode circuits have the following properties:
● Switch off surge voltage can be totally avoided.
● High switch-off delay (6 to 9 times higher than without protective circuit).
ET 200S
Operating Instructions, 08/2008, A5E00515771-06
1
with diode
with Zener diode
Zener diode has higher switch off voltage.
Zener diode switches off faster than diode circuit
D.1 Special Measures for Interference-Free Operation
2
Interference-free operation
151
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