35
3. Important Notes：
1. Use the reed switch should pay attention to the operating voltage, current,operating current not
exceeding 30mA.
2. Require the installation of the current limiting resistor when using reed switch
3. Current limiting resistor is calculated by:
4. R=V/I R=Limiting resistor V=Input voltage I=Maximum current(0.03A=30mA)
Current Spreadsheet:
Input Voltage(V)
Limiting Resistor(Ω)
Current Estimates Recommend Resistance
Specifications(W)
5 250
20mA
2W
12 600 2W
24 1.2K 2W
36 1.8K 2W
48 2.4K 2W
60 3K 2W
80 4K 2W
100 5.1K 2W
110 5.62K 2W
3. PLC Example:
1. Low-level Control (taking PLC for example)
2. High-level Control (taking PLC for example)
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