Electric Equipment Control And PLC B $.$ Please guys help me to solve these Questions in the follwing picture :

$(1)$ Please explain the main function of this program segment in Example $1$ and justify

why edge detection is necessary. What impact would it have on the program if edge

detection was not included?

$(2)$ In Example $1,$ when these two instructions are used together, please describe the

output signal from $T1.$

$(3)$ Please analyze how the program execution would change if the last instruction $($JMP

COMM$)$ were removed from the given three instructions.

$(5)$ Please describe the main role or function of this instruction.