Function plcs

Question 1

What are programmable logic controllers (PLCs) represented as in systems diagrams?

Answer 1

Process blocks

Process blocks are key components in controlling output based on input signals.

Question 2

What do process blocks in PLCs respond to?

Answer 2

Signals from input blocks

This response is used to control output blocks.

Question 3

What is the function of a motor driver integrated circuit (IC)?

Answer 3

Provide extra current to drive motor outputs

PLCs alone cannot supply sufficient current for motor operations.

Question 4

What is a commonly used motor driver IC for simple functionality?

Answer 4

Darlington driver IC, such as the ULN2803

This type of IC is suitable for basic motor control.

Question 5

What motor driver IC is used for more complex functions, such as bidirectional currents?

Answer 5

L293D

This IC allows motors to reverse and perform other complex tasks.

Question 6

What is the purpose of interface devices in PLC systems?

Answer 6

Allow communication between input/output devices and the PLC

They ensure integrity and accuracy of information.

Question 7

How are interface devices typically designed?

Answer 7

Modular design for direct connection and ease of maintenance

This design is important for efficient use in manufacturing environments.

Question 8

What characteristic must interface devices possess for use in manufacturing environments?

Answer 8

Rugged design

They must withstand harsh conditions commonly found in these settings.

Question 9

Fill in the blank: Programmable logic controllers (PLCs) use __________ to control output blocks.

Answer 9

signals from input blocks

This is a fundamental operation in PLC systems.