Which of the following status bits is set when the result of math or move instructions is a negative number?

In the following ladder logic diagram, the counter up instruction C5:1 is incremented once when PB1 is pressed and ____.

In the following ladder logic diagram, if the counter up C5:0 is incremented from 5 to 15, then what must be true?

In the following ladder logic diagram, 50 seconds after the SW1 switch is opened, which of the following statements correctly describes the result?

Using group_by() on an object doesn’t change the class of the object.

If the accumulated register is equal to the preset register in an Allen-Bradley SLC 500 PLC’s timer off-delay (TOF), which of the following statements is correct?

The content of the ____ register is the preset value that the timer is initialized to hold.

In GRT and GEQ instructions, both Source A and Source B can be ______________________________.

The instructions in the rungs between two MCR instructions turn ______________________________ whenever the MCR instruction is activated.

An add (ADD) instruction has ______________________________ operands.