General: Connecting Wired Inputs
Wired Inputs consist of wired sensors or wired signals from other devices. They are wired to Analog Input (AI), Digital Input (DI), or Universal Input (UI) terminals of controllers that support wired Input points.
Wired Inputs are grouped into 2 main groups:
- Digital - Only 2 possible states: either an open circuit or a closed circuit. Includes: simple switches/buttons, relays, and other types of dry contact (ex. status signals from other devices).
- Analog - Many possible states based on Voltage, Resistance, or Current. Includes: Temperature, Humidity, Pressure, CO2, Position Feedback, etc...
Digital Inputs are connected between the Ground(GND) terminal and the selected DI or UI terminal. There is no polarity for Digital Input wiring (ie. input wires can be swapped).
Analog Inputs are connected between the Ground(GND) terminal and the selected AI or UI terminal. There is usually a correct polarity for Analog Inputs (ie. correct wire must be on AI/UI terminal).
There are 3 main types of Analog Inputs:
- Resistance - Input is based on resistance. The most commonly used resistance input is Thermistor temperature sensors where resistance varies with change in temperature. There is no polarity for Resistance inputs (ie. input wires can be swapped).
- 0-10vdc - Input is based on DC voltage signal over the range of 0v to 10v. This voltage range is related to a defined range on the device that produces the 0-10v signal.
- 4-20mA - Input is based on current signal over the range of 4mA to 20mA. This current range is related to a defined range on the device that produces the 4-20mA signal. Because this signal is based on loop current it does not suffer from voltage loss due to long wire runs, or damage to the wire.
Note: On many devices there are input pin configuration settings (hardware and/or software) that must be configured correctly for each different type of input. See hardware specific instructions for these input pin configurations.
- Connecting Wired Edge28 IO Points
General: Connecting Wired Outputs
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