With reference to IREF shown,if the pushbutton is momentarily actuated the data in the IPAGE:
A)changes immediately.
B)is latched in for one scan.
C)executes immediately.
D)executes after a delay of one scan.

Question

With reference to IREF shown,if the pushbutton is momentarily actuated the data in the IPAGE: 
A)changes immediately. 
B)is latched in for one scan. 
C)executes immediately. 
D)executes after a delay of one scan.

Quizplus · Accepted Answer

Based on the ladder diagram shown, the pushbutton triggers a latch instruction which will store the data in the IPAGE register. Since it is a latch instruction, the data will be retained for one complete scan of the program before it is reset. Therefore, option B is the best choice. The data will not change immediately or execute immediately, and there is no indication of a delay in the program.

With Reference to IREF Shown,if the Pushbutton Is Momentarily Actuated