SKILL $2$

DESIGN A PLC PROGRAM THAT USES SUBROUTINES TO CONTROL A MOTOR

APPLICATION WITH AN ALARM

PROCEDURE OVERVIEW

In this procedure, you will design a PLC program that uses subroutines to control a motor application with an alarm.

Examine the following information.

Scenario: A bulk conveyor is used to transport raw material. Material is placed onto the conveyor by a hopper$/$ dispenser. The conveyor uses a sensor$,$ PS$1,$ to determine that the conveyor load is at an acceptable level.

Write a PLC program to control the bulk conveyor's operation. The general sequence, I$/$O diagram, and pictorial follow:

General Sequence

Pressing PB$1$ momentarily causes the conveyor motor to start.

Pressing PB$2$ momentarily causes the conveyor motor to stop.

Pressure switch PS$1$ shuts off the motor and calls an alarm subroutine whenever it senses an overload condition $($closes$).$ The alarm consists of a bell and rotating beacon light simulated by lamps $1$ and $2.$ The motor will not start until PS$1$ opens and the alarm is reset.

NOTE

Selector Switch SS$1$ os used to simulate pressure switch PS$1$ in this skill.

L$57207-$AA$15$UEN$-$E$1-$S$01,$ REV. A PLC SUBROUTINES

S$01-1$