What occurs when the WAIT instruction WAIT DI[23]=ON+ is executed?

What occurs when the WAIT instruction WAIT DI[23]=ON+ is executed?

• A. It will stop the program until DI[23] is off
• B. It will continue if DI[23] is off then on
• C. It will execute once and then halt
• D. It will cycle through the program multiple times

Answer: (B)

When the WAIT instruction WAIT DI[23]=ON+ is executed, the program will continue its execution only when the specified condition regarding the digital input DI[23] is met, specifically that DI[23] transitions from the off state to the on state. This means that if DI[23] is initially off and then turns on, the instruction allows the program to proceed. This instruction is designed to pause the program until the condition it checks for is satisfied. It effectively creates a dependency on the state of the input DI[23], making it essential for controlling the flow of the program based on external signals or inputs. When the input turns on, it fulfills the condition, permitting the program to continue executing from that point onward. In contrast, the other options do not accurately describe the behavior of the WAIT instruction in this context, as they do not reflect the specific triggering condition required for the program's continuation based on the state of the digital input.

When the WAIT instruction WAIT DI[23]=ON+ is executed, the program will continue its execution only when the specified condition regarding the digital input DI[23] is met, specifically that DI[23] transitions from the off state to the on state. This means that if DI[23] is initially off and then turns on, the instruction allows the program to proceed.

This instruction is designed to pause the program until the condition it checks for is satisfied. It effectively creates a dependency on the state of the input DI[23], making it essential for controlling the flow of the program based on external signals or inputs. When the input turns on, it fulfills the condition, permitting the program to continue executing from that point onward.

In contrast, the other options do not accurately describe the behavior of the WAIT instruction in this context, as they do not reflect the specific triggering condition required for the program's continuation based on the state of the digital input.