Deck 15: Introduction to Programmable Control

Question 1

The compilation of all available instructions for a given PLC is called the ____.

A) instruction ladder
B) instruction set
C) block diagram
D) configuration

Answer 1

B

Question 2

Through a sophisticated system of digital signal transmission and reception, binary data can be organized in a structured format called a(n) ____.

A) protocol
B) Ethernet
C) instruction set
D) data highway

Answer 2

A

Question 3

In industrial applications where the PLC will replace the relay logic circuit, the operator controls and process switches will generally remain as they are wired.

Answer 3

True

Question 4

The time required for the PLC to complete one scan (read inputs, solve logic, and update outputs) is called the scan time. A typical value for scan time is in the order of ____.

A) 20 msec
B) 20 ns
C) 20 $\mu$ s
D) 20 seconds

Question 5

The input signal must be converted to a(n) ____ logic voltage for use in the processor.

A) high voltage DC
B) low-level AC
C) analog
D) low-level DC

Question 6

The most common PLC programming language used in industry is called ____________________.

Question 7

The only devices in the decision maker category for the PLC system are the ___________________ that reside in the PLC logic program.

Question 8

Volatile memory will lose its programmed contents if operating power is removed or lost.

Question 9

By definition, ____________________ devices are all devices outside the processor, including all hardware.

Question 10

A PLC system offers many advantages over a relay-based control system except that it can be difficult to implement.