Siemens 6ES7321-1BL00-0AA0 SIMATIC S7-300 SM321 Digital Input

Analog inputs and outputs

Analog inputs and outputs are continuous, variable signals.Typical analog signals vary from 0 to 20 milliamps, 4 to20 milliamps, or 0 to 10 volts.In the following example, a level transmitter monitors the levelof liquid in a storage tank and sends an analog signal toa PLCinput. 6ES7321-1BL00-0AA0 An analog output from the PLC sends an analog signal toa panel meter calibrated to show the level of liquid in the tank.Two other analog outputs, not shown here, are connected tocurrent-to-pneumatic transducers that control air-operated flow-control valves. This allows the PLC to automatically control theflow of liquid into and out of the storage tank.

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