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LED 7 Segment Displays are sometimes referred to as BCD to 7 Segment decoders. These displays are commercially available or can be easily constructed by arranging basic LEDs in the same framework as the actual display. This display accepts BCD numbers that are decoded into digits 0 to 9. Connect this display to a PLC's output card.

A seven-segment display is a type of electronic display device for displaying decimal numbers that is less sophisticated than dot matrix displays.

Driving seven-segment displays are classified into two types: common anode and common cathode. In the common anode type, all of the anodes on the display are connected to a single pin, often the power supply, and the LEDs are controlled by the cathodes with the ground turned on and the power turned off.

The main features of a Seven Segment Display in SCADA are the following:

  • The digits are arranged in two columns, with the decimal point and leading zero shared by both columns;
  • Each digit has two segments;
  • The decimal point and leading zero are shared by both columns;

  • A seven segment display is used in an SCADA system to display information from the process. It is used in conjunction with a single bit input.
  • The seven segment display is made up of seven LED segments, which are arranged in a particular order. The order of the segments corresponds to their respective values, which are 0-5V.

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