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Questions and Answers
What is the primary function of a PLC?
What is the primary function of a PLC?
- To execute the user-written program stored in memory (correct)
- To facilitate faster and less costly duplication of application
- To provide integrated diagnostic and override functions
- To continuously monitor the status of connected devices
Which component of a PLC is responsible for data manipulation and timing functions?
Which component of a PLC is responsible for data manipulation and timing functions?
- Inputs
- Execution of the program (correct)
- Communication Ports (RS-485)
- Outputs
What is the role of communication ports (RS-485) in a PLC?
What is the role of communication ports (RS-485) in a PLC?
- To provide power supply to the PLC
- To facilitate communication with external devices (correct)
- To monitor the status of field devices
- To execute the program stored in memory
What is the function of PLC inputs?
What is the function of PLC inputs?
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What is a key advantage of PLCs in terms of system changes?
What is a key advantage of PLCs in terms of system changes?
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Study Notes
What is PLC
- A programmable controller (PLC) is a solid-state device that belongs to the computer family.
- It stores instructions to implement control functions such as sequencing, timing, counting, arithmetic, data manipulation, and communication.
- PLCs control industrial machines and processes.
History of PLC
- The design criteria for the first programmable controller were specified in 1968 by General Motors Corp.
- In the 1970s, communication abilities emerged.
- In the 1980s, standardization on communication protocols occurred.
- In the 1990s, standardization on programming language took place.
Prior to PLCs
- Devices used contactors and relays that were hard-wired together.
- Circuits had to be designed and drawn up first.
- Components were specified and installed.
- Electricians would then wire everything together.
Advantages of PLC
- PLCs can perform the same tasks as hard-wired devices.
- Connections between field devices and relay contacts take place in the PLC.
- Installation is less extensive with PLCs.
- PLCs can perform more complex functions than hard-wired devices.
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