Discrete input

An input device comprising:

• an input line connected to a voltage divider node for connecting a load to the voltage divider node;
• a first switching component connected to the voltage divider node;
• a first resistor connected to the voltage divider node for connecting a first voltage source to the input line;
• a second resistor connected between the input line and the voltage divider node for limiting current to the load, wherein the first voltage source is also connected to the first switching component;
• and a second switching component operatively connected to the first switching component, wherein the second switching component is configured to connect a second voltage source to a logic device for discrete input to the logic device that is decoupled from voltage supplied to the input line by the first voltage source for providing logic high and low input regardless of voltage supplied by the first voltage source, wherein the first voltage source is operatively connected to the first resistor and the second voltage source separate from the first voltage source operatively connected to the second switching component.

An input device comprising:

• an input line connected to a voltage divider node for connecting a load to the voltage divider node;
• a first switching component connected to the voltage divider node;
• a first resistor connected to the voltage divider node for connecting a first voltage source to the input line;
• a second resistor connected between the input line and the voltage divider node for limiting current to the load, wherein the first voltage source is also connected to the first switching component;
• and
• a second switching component operatively connected to the first switching component, wherein the second switching component is configured to connect a second voltage source to a logic device for discrete input to the logic device that is decoupled from voltage supplied to the input line by the first voltage source for providing logic high and low input regardless of voltage supplied by the first voltage source, wherein the load is operatively connected to the input line of the input device.