Siemens S7-300 Installation And Operating Manual page 328

Switching capacitive and inductive loads
Remedy:
1. Determine the load current and the capacitance of the load.
2. Determine the operating point in the diagram above.
3. If the operating point lies above the curve, you must do one of the following:
Switching behavior SM 326; F-DO 10 x DC 24V/2A PP
①
0.1 Hz
②
0.2 Hz
③
0.5 Hz
Figure E-2 Max. permitted inductive load depending on load current and switching frequency
328
– Increase the load current by connecting a resistor in parallel until the new operating
point is below the curve
– Use the output with series diode
④
1 Hz
⑤
2 Hz
⑥
5 Hz
⑦
10 Hz
⑧
20 Hz
⑨
30 Hz
Installation and Operating Manual, 01/2010, A5E00085586-10
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Fail-safe signal modules