(* Motor start/stop station. *)
(* Start runs the motor and it keeps running when Start is released. Stop and E-Stop both stop it, and while E-Stop is pressed Start must do nothing. Light the Running lamp whenever the motor runs. Both stop buttons are wired normally closed, so they read 1 when nobody is pressing them. *)

VAR_GLOBAL
  Start_PB AT %IX0.0  : BOOL; (* Start pushbutton, normally open *)
  Stop_PB  AT %IX0.1  : BOOL; (* Stop pushbutton, normally closed, 1 when healthy *)
  EStop_OK AT %IX0.2  : BOOL; (* Emergency stop, normally closed, 1 when healthy *)
  Motor    AT %QX0.0  : BOOL; (* Motor contactor *)
  Run_Lamp AT %QX0.1  : BOOL; (* Running indicator *)
END_VAR

PROGRAM Main
  (* Write the logic here. *)
END_PROGRAM