P5-14. Develop a ladder logic program to handle a low bunker alarm for a coal-fired power

plant coal bunker. The devices are shown in Figure P5.14. Normal sequence of events:

Coal bunker 2 becomes low for 3 seconds (BUNK2_LLEV turns off for 3 sec.)

which causes

• BUNK2_LLMP starts flashing (1 sec. on, I sec. off)

• ALARM HORN sounds (turns on).