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140DSI35300 Shunt Resistor Explained

Issue

The purpose of this resolution is to explain why a resistor is added across switching devices connected to a 140DSI35300 Supervised Input Module.
re: Modicon Quantum Automation Series Hardware reference Guide, p/n 840USE10000

Product Line
Quantum

Resolution

If the field connection is good, when the switching device connected to a module input is open circuit, this shunt resistor completes the circuit and provides a small current sensed by the module. This current indicates that field wiring is not interrupted and a complete circuit exists.

The resistor selection is sized so a minimum input current of 0.15 mA is maintained. If input current drops below that, the module will signal a broken field connection in the appropriate bits of I/O mapped Broken Wire registers #3 and #4.

Schneider Electric Україна

140DSI35300 Shunt Resistor Explained

Issue

The purpose of this resolution is to explain why a resistor is added across switching devices connected to a 140DSI35300 Supervised Input Module.
re: Modicon Quantum Automation Series Hardware reference Guide, p/n 840USE10000

Product Line
Quantum

Resolution

If the field connection is good, when the switching device connected to a module input is open circuit, this shunt resistor completes the circuit and provides a small current sensed by the module. This current indicates that field wiring is not interrupted and a complete circuit exists.

The resistor selection is sized so a minimum input current of 0.15 mA is maintained. If input current drops below that, the module will signal a broken field connection in the appropriate bits of I/O mapped Broken Wire registers #3 and #4.

 

Schneider Electric Україна

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