Special Measures for Interference-Free Operation
F-3
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Wiring of DC-operated coils
DC-operated coils are wired with diodes and Zener diodes as illustrated in the
following figure.
+
--
+
--
With diode
With Zener diode
Figure F-2
Wiring of DC-operated coils
A circuit with diodes/Zener diodes has the following features:
•
Switching overvoltages can be completely avoided.
A Zener diode has higher circuit interruption voltage.
•
Long switch-off delay (6 to 9 times longer than without a protective circuit).
A Zener diode switches off quicker than a diode circuit
Wiring of AC-operated coils
AC-operated coils are wired with varistors or RC elements as illustrated in the
figure.
With varistor
With RC element
~
~
~
~
Figure F-3
Wiring of AC-operated coils
A circuit with a varistor has the following features:
•
The amplitude of the switching overvoltage is limited but not dampened.
•
The gradient of the overvoltage remains the same.
•
The switch-off delay is short.
A circuit with RC elements has the following properties:
•
The amplitude and gradient of the switching overvoltage are reduced.
•
The switch-off delay is short.
Содержание SIMATIC ET 200S
Страница 42: ...Product Overview 1 16 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 64: ...Brief Instructions on Commissioning ET 200S 2 22 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 112: ...Configuration Options 3 48 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 232: ...Commissioning and Diagnostics 6 72 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 244: ...General Technical Specifications 7 12 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 274: ...Interface Modules 8 30 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 538: ...4 IQ SENSE 13 18 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 564: ...Address Space of the Input and Outputs of the ET 200S C 4 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 574: ...Response Times D 10 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 580: ...Special Measures for Interference Free Operation F 4 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 600: ...Product Information on the Use of subassemblies modules in a Zone 2 Hazardous Area 2 A5E00352937 02 ...