Question
Download Solution PDFPLC operates on the following signals
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
PLC:
- A PLC (Programmable Logic Controller) also known as PLC is a specialized computer used to control machines and processes.
- PLC operates on digital signals.
- The PLC uses a programmable memory to store/ save instructions and specific functions that include ON/OFF control, counting, arithmetic, timing, sequencing, and also data handling.
The structure of a PLC:
Steps of PLC Operations:
- Input scan: In this, the state of all input devices that are connected to the PLC is detected.
- Program scan: This step executes the user-created program logic.
- Output scan: This step energizes or de-energizes all output devices that are connected to the PLC.
- Housekeeping: This step includes communications with programming terminals, internal diagnostics, etc.
Advantages of a PLC control system:
- It is flexible.
- It has a faster response time.
- It is easy to repair and expand the modular design.
Last updated on May 26, 2025
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