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.