Author Question: The examine if open instruction ________. A) Is an input instruction only used for field devices ... (Read 127 times)

vinney12 · **on:** Jul 28, 2018

The examine if open instruction ________.

A) Is an input instruction only used for field devices with NC contacts
B) Can only be assigned an input file address starting I:
C) Has the following logic symbol (- -)
D) Has the following logic symbol (-/-)

Question 2

The light source of a photoelectric sensor used in a long distance sensing application is ________.

A) An incandescent lamp B) A light emitting diode
C) A photo cell D) A laser