Analog Inputs and Outputs
Analog inputs and outputs are continuous, variable signals.
Typical analog signals vary from 0 to 20 milliamps, 4 to
20 milliamps, or 0 to 10 volts.
In the following example, a level transmitter monitors the level
of liquid in a storage tank and sends an analog signal to a PLC
input. An analog output from the PLC sends an analog signal to
a panel meter calibrated to show the level of liquid in the tank.
Two other analog outputs, not shown here, are connected to
current-to-pneumatic transducers that control air-operated flowcontrol
valves. This allows the PLC to automatically control the
flow of liquid into and out of the storage tank.
Typical analog signals vary from 0 to 20 milliamps, 4 to
20 milliamps, or 0 to 10 volts.
In the following example, a level transmitter monitors the level
of liquid in a storage tank and sends an analog signal to a PLC
input. An analog output from the PLC sends an analog signal to
a panel meter calibrated to show the level of liquid in the tank.
Two other analog outputs, not shown here, are connected to
current-to-pneumatic transducers that control air-operated flowcontrol
valves. This allows the PLC to automatically control the
flow of liquid into and out of the storage tank.
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