Cargo Elevator System Using XG5000 PLC Programming

This article will discuss the elevator system for transporting cargo using the XG5000 PLC programming. This elevator system is designed to operate on 3 floors. Elevators can only move Up or Down 1 floor. Each floor has a button to move to the required floor. Limit switch sensors on each floor are used to mark the elevator movement limits.

Program Objective

Floor 1:

1. The elevator must already be on the 1st floor.
2. There is 1 button (Up only).
3. When the up button is pressed, the elevator will automatically move up to the 2nd floor.
4. The elevator will stop when it reaches the 2nd floor.

Floor 2:

1. The elevator must already be on the 2nd floor.
2. There are 2 buttons (Up and Down).
3. The up button will move the elevator to the 3rd floor.
4. The down button will move the elevator to the 1st floor.

Floor 3:

1. The elevator must already be on the 3rd floor.
2. There is 1 button (Down only).
3. When the Down button is pressed, the elevator will move down to the 2nd floor.

Limit Switch Sensor:

Each floor has a Limit Switch to detect the elevator’s position and ensure it stops at the desired floor.

3-Floor Cargo Elevator Program in XG5000

Mapping Details

S.No.	Comment	Input (I)	Output (Q)	Memory Bit
1	START	P0000
2	STOP	P0001
3	LS_FLOOR1	P0002
4	PB_UP_FLOOR2	P0003
5	LS_FLOOR2	P0004
6	PB_UP_FLOOR3	P0005
7	LS_FLOOR3	P0006
8	PB_DOWN_FLOOR1	P0007
9	PB_DOWN_FLOOR2	P0008
10	FLOOR1_TO_2		P0040
11	FLOOR2_TO_3		P0041
12	FLOOR2_TO_1		P0042
13	FLOOR3_TO_2		P0043
14	SYSTEM_ON			M0000

Cargo Elevator System

RUNG 1 (START SYSTEM)

In this Rung, the memory bit SYSTEM_ON (M0000) will be in the HIGH state when the START (P0000) button is pressed. Because it uses Latching, the memory bit SYSTEM_ON (M0000) will remain in the HIGH state even though the START (P0000) button has been released.

The memory bit SYSTEM_ON (M0000) will be in the LOW state if the STOP (P0001) button is pressed.

RUNG 5 (FLOOR-1)

In this Rung, when the NO contact of the memory bit SYSTEM_ON (M0000) and the Limit Switch LS_FLOOR1 (P0002) are in the HIGH state and the PB_UP_FLOOR2 (P0003) button is pressed, the FLOOR1_TO_2 (P0040) output will be ON.

Because it uses the SET Coil Instruction, the output FLOOR1_TO_2 (P0040) will remain in the ON state even though the PB_UP_FLOOR2 (P0003) button has been released and the Limit Switch LS_FLOOR1 (P0002) is in the LOW state.

Next, when the Limit Switch LS_FLOOR2 (P0004) is in the HIGH state, the output FLOOR1_TO_2 (P0040) will be OFF. Because it uses the RESET Coil Instruction.

RUNG 15 (FLOOR-2)

In this Rung, when the NO contact of the memory bit SYSTEM_ON (M0000) and the Limit Switch LS_FLOOR2 (P0004) are in the HIGH state and the PB_UP_FLOOR3 (P0005) button is pressed, the FLOOR2_TO_3 (P0041) output will be ON.

Because it uses the SET Coil Instruction, the output FLOOR2_TO_3 (P0041) will remain in the ON state even though the PB_UP_FLOOR3 (P0005) button has been released and the Limit Switch LS_FLOOR2 (P0004) is in the LOW state.

Next, when the Limit Switch LS_FLOOR3 (P0006) is in the HIGH state, the output FLOOR2_TO_3 (P0041) will be OFF. Because it uses the RESET Coil Instruction.

RUNG 24

In this Rung, when the NO contact of the memory bit SYSTEM_ON (M0000) and the Limit Switch LS_FLOOR2 (P0004) are in the HIGH state and the PB_DOWN_FLOOR1 (P0007) button is pressed, the FLOOR2_TO_1 (P0042) output will be ON.

Because it uses the SET Coil Instruction, the output FLOOR2_TO_1 (P0042) will remain in the ON state even though the PB_DOWN_FLOOR1 (P0007) button has been released and the Limit Switch LS_FLOOR2 (P0004) is in the LOW state.

Next, when the Limit Switch LS_FLOOR1 (P0002) is in the HIGH state, the output FLOOR2_TO_1 (P0042) will be OFF. Because it uses the RESET Coil Instruction.

RUNG 34 (FLOOR-3)

In this Rung, when the NO contact of the memory bit SYSTEM_ON (M0000) and the Limit Switch LS_FLOOR3 (P0006) are in the HIGH state and the PB_DOWN_FLOOR2 (P0008) button is pressed, the FLOOR3_TO_2 (P0043) output will be ON.

Because it uses the SET Coil Instruction, the output FLOOR3_TO_2 (P0043) will remain in the ON state even though the PB_DOWN_FLOOR2 (P0008) button has been released and the Limit Switch LS_FLOOR3 (P0006) is in the LOW state.

Next, when the Limit Switch LS_FLOOR2 (P0004) is in the HIGH state, the output FLOOR3_TO_2 (P0043) will be OFF. Because it uses the RESET Coil Instruction.

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