PLC Program for Stage Control: Curtains and Stage Elevation

The PLC program for stage control provides the opening and closing of curtains, as well as the raising and lowering of the stage. It provides two modes of operation: automatic and manual.

PLC Program for Stage Control

The below simulation shows the usage of PLC for stage-controlling applications.

This is a utility project where we have to open and close the stage curtains automatically and also manually using push buttons. The sensors are used to detect the right and left curtains’ positions at different points.

After opening the curtains, the stage will be moved up and elevated to the top position. Similarly, when the curtains are closed, the center stage will be moved down.

The stage position will also be tracked using lower and upper limit sensors.

PLC Devices List

The below table lists the all inputs and outputs in this PLC program.

Type	Device No.	Device name	Operation
Input	X0	Inside (Left curtain)	ON when the curtain is halfway.
Input	X1	ON when the curtain closes completely.	ON when the curtain opens completely.
Input	X2	Outside (Left curtain)	ON when the curtain closes completely.
Input	X3	Inside (Right curtain)	ON when the curtain is on its half-way.
Input	X4	Middle (Right curtain)	ON when the curtain opens completely.
Input	X5	Outside (Right curtain)	ON when the stage reaches a lower limit.
Input	X6	Stage upper limit	The stage moves up when Y2 is ON. The stage stops when Y2 is OFF.
Input	X7	Stage lower limit	ON when the stage reaches the upper limit.
Output	Y0	Curtain open command	Curtains open when Y0 is ON. Curtains stop when Y0 is OFF.
Output	Y1	Curtain close command	Curtains close when Y1 is ON. Curtains stop when Y1 is OFF.
Output	Y2	Stage up	The stage moves up when Y2 is ON. The stage stops when Y2 is OFF.
Output	Y3	Stage down	The stage moves down when Y3 is ON. The stage stops when Y3 is OFF.
Output	Y5	Buzzer	Sounds when Y5 is ON (Lamp on screen is lit).

Program Description

PLC program to Control stage settings including opening/closing curtains and raising/lowering the stage.

The purpose of this PLC program is to facilitate control over a range of stage settings, encompassing tasks such as opening and closing curtains, as well as raising and lowering the stage itself. To accommodate different preferences and requirements, the program offers two distinct modes of operation: automatic and manual.

Automatic Operation

When the “Begin” pushbutton (X16) on the operation panel is pressed, a buzzer (Y5) emits a sound for a duration of 5 seconds.

Note: The “Begin” pushbutton (X16) can only be activated when the curtains are closed and the stage is positioned at its lower limit.

After the buzzer stops, the command to open the curtains (Y0) is activated. The curtains will continue opening until they reach their outer limits, as defined by input signals X2 and X5.

Once the curtains are fully opened, the stage begins to elevate when the “Stage up” command (Y2) is activated. The stage will continue moving upward until it reaches its upper limit, as indicated by input signal X6.

Pressing the “End” pushbutton (X17) on the operation panel initiates the closing of the curtains. The command to close the curtains (Y1) is activated, and the curtains will close until they reach their inner limits, defined by input signals X0 and X3.

Manual Operation

The following operations are only available when the automatic operation described above is not active.

The curtains can be opened by pressing the “Curtain open” pushbutton (X10) on the operation panel. The curtains will stop once they reach their outer limits (X2 and X5).

The curtains can be closed by pressing the “Curtain close” pushbutton (X11) on the operation panel. The curtains will continue closing until they reach their inner limits (X0 and X3).

The stage can be raised by pressing the “⬆Stage up” pushbutton (X12) on the operation panel. The stage will stop once it reaches its upper limit (X6).

The stage can be lowered by pressing the “⬇Stage down” pushbutton (X13) on the operation panel. The stage will stop once it reaches its lower limit (X7).

The indicator lamps on the operation panel will illuminate or turn off accordingly, providing visual feedback on the status of the curtains and stage operations.

PLC Programming

Source: Mitsubishi Electric

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