ME$343$ HW$-4$ for Fall $2024$

Design a ladder logic of PLC for a drilling machine operation. The main functions or logical sequences include

$(1)$ Start to hold the part to be drilled until the part is firmly held $($detected by a strain$-$gage sensor$)$;

$(2)$ Tum on the drilling machine $($with an indication light$-$on$),$ which then starts the moving of drillbit towards the part;

$(3)$ When the drilling reaches a desired depth $($detected by a depth sensor$),$ start to withdraw the drill$-$bit out of the part;

$(4)$ When the drill$-$bit is pulled back to its original position $($detected by a position sensor$),$ turn$-$off the drilling machine, and also turn$-$off the indication light;

$(5)$ Release the part from the holding device.