1.4 PRACTICE PROBLEMS

1. What is the most commonly used type of I/O interface?

a) Analog

b) Discrete inputs

c) Output modules

d) Discrete I/O

(ans. d)

2. TRUE or FALSE -- 1K is larger when speaking about memory than when speaking to communication speeds.

(ans. true)

3. A modular PLC is best described as,

a) a highly expandable controller.

b) an all in one controller.

c) about the size of a lawnmower.

d) a modular system.

(ans. b)

12. What factors affect the selection of the size of a PLC.