PLC Midterm

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Questions and Answers

Connects all field devices to the CPU and acts as the interface between them.

The input/output (I/O) section

The PLC’s memory system stores information about the status of all the inputs and outputs. To keep track of all this information, it uses a system called (_______).

Addressing

Represent information elements with each bit, indicating the status of external contacts or the presence/absence of power in a process circuit.

Connecting to ON/OFF nature field input devices like selector switches and limit switches

Discrete I/O modules

The common type of I/O interface module is the (________).

<p>Discrete type</p> Signup and view all the answers

If a device receives current when it is ON, it is said to be (_______) current

<p>Sinking</p> Signup and view all the answers

If a device provides current when it is ON, it is said to be (________) current

<p>Sourcing</p> Signup and view all the answers

It can accept an input signal that varies in the positive direction only.

<p>Unipolar</p> Signup and view all the answers

Swing between a maximum negative value and a maximum positive value

<p>Bipolar</p> Signup and view all the answers

Allows the user to read the signal from an encoder on a real-time basis and stores this information so it can be read later by the processor.

<p>ENCODER-COUNTER MODULE</p> Signup and view all the answers

Provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.

<p>STEPPER-MOTOR MODULE</p> Signup and view all the answers

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Study Notes

PLC System Components

  • The PLC connects all field devices to the CPU and acts as an interface between them.

PLC Memory System

  • The PLC's memory system stores information about the status of all inputs and outputs.
  • It uses a system to keep track of all this information, representing each bit as an information element indicating the status of external contacts or the presence/absence of power in a process circuit.

I/O Interface Modules

  • The common type of I/O interface module is the digital module, which connects to ON/OFF nature field input devices like selector switches and limit switches.

Current in Devices

  • If a device receives current when it is ON, it is said to be sinking current.
  • If a device provides current when it is ON, it is said to be sourcing current.

Signal Types

  • Unipolar signals can accept an input signal that varies in the positive direction only.
  • Bipolar signals swing between a maximum negative value and a maximum positive value.

Encoder Interface

  • The encoder interface allows the user to read the signal from an encoder on a real-time basis and stores this information so it can be read later by the processor.
  • It provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.

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