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Digital
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Inputs
The FAC-2100
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has
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ten
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total
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digital
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inputs
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with
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following
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capability:
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- Eight
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- Standard
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- Digital
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- Inputs
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- that
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- can
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- read
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- a
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- wide
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- voltage
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- range
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- which
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- includes
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- 200VDC
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- and
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- 120VAC
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- signals.
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- Two
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- Universal
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- Digital
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- Inputs
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- that
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- can
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- read
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- digital
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- waveform
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- signals
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- with
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- voltages
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- up
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- to
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- 28VDC.
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- These
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- channels
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- allow
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- the
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- FAC-2100
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- to
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- read
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- frequency
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- and
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- duty
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- cycle
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- and
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- can
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- be
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- paired
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- for
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- quadrature
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- decoding.
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Basic On/Off
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Mode
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Both
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the
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Universal
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and
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Standard
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Digital
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Inputs
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can
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read
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in
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basic
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on/off
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mode.
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In
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this
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mode
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the
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controller
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determines
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if
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the
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input
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signal
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is
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present
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or
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not.
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Frequency and Duty Cycle Measurements
Universal Digital Inputs can process a waveform and determine the signal's frequency and duty cycle.
Quadrature Decoder
Signals that are quadrature encoded provide direction and speed of an attached sensor from two signals (typically called Channel A and Channel B). The Universal Digital Inputs can be used as a pair to decode these types of signals with Channel A going to DUIN1 and Channel B to DUIN2.
If the quadrature encoder output is using a driver such as an RS-485 or RS-422 transceiver, it is recommended that each DUIN+ and DUIN- signals be terminated with an impedance that matches the transmission line. To accomplish this, install a resistor (typically around 120 ohms) across both the DUIN1 and DUIN2 plus and minus terminals.
Wiring
Each digital input channel consists of an opto-isolated LED / transistor pair with a dynamic drive circuit that permits a wide input voltage range to be applied. Each of the modes described above utilize the same wiring configuration.
Notes: The suggested wiring above uses digital input 1. Any digital input could be wired in a similar configuration. Also, because the digital inputs are opto-isolated, the circuit could have been wired with a jumper between pins b and J with wires from K and c connecting to the switch.