The IREFs shown in the FBD:

A)are used to send a value to an output device or tag.
B)are used to receive a value from an input device or tag.
C)must contain tags.
D)both b and c.

Question

The IREFs shown in the FBD:

A)are used to send a value to an output device or tag. 
B)are used to receive a value from an input device or tag. 
C)must contain tags. 
D)both b and c.

Quizplus · Accepted Answer

IREFs are used to receive a value from an input device or tag, hence option B is correct. They must contain tags to function properly, as stated in option C. Therefore, options B and C are both correct, making option D the best choice.

The IREFs Shown in the FBD