帮我用西门子LAD语言写一个电梯程序

好的，以下是一个简单的电梯程序，使用西门子LAD语言编写：

NETWORK ELEVATOR
TITLE "Elevator Control"

// Inputs
I0.0: Floor 1 button
I0.1: Floor 2 button
I0.2: Floor 3 button
I0.3: Floor 4 button
I0.4: Elevator call button (up)
I0.5: Elevator call button (down)
I0.6: Door closed limit switch
I0.7: Door open limit switch

// Outputs
Q0.0: Elevator motor up
Q0.1: Elevator motor down
Q0.2: Door motor open
Q0.3: Door motor close
Q0.4: Floor 1 indicator light
Q0.5: Floor 2 indicator light
Q0.6: Floor 3 indicator light
Q0.7: Floor 4 indicator light

// Internal variables
M0.0: Elevator motor direction
M0.1: Door motor direction
M0.2: Door open timer
M0.3: Floor 1 button pressed
M0.4: Floor 2 button pressed
M0.5: Floor 3 button pressed
M0.6: Floor 4 button pressed
M0.7: Elevator call button pressed
M1.0: Elevator stopped at floor 1
M1.1: Elevator stopped at floor 2
M1.2: Elevator stopped at floor 3
M1.3: Elevator stopped at floor 4

// Main program
LD I0.0 // Check if floor 1 button is pressed
AN M0.3 // Check if floor 1 button has not already been pressed
TO M0.3 // Store floor 1 button pressed status
SET Q0.4 // Turn on floor 1 indicator light
SET M1.0 // Set elevator stopped at floor 1 status

LD I0.1 // Check if floor 2 button is pressed
AN M0.4 // Check if floor 2 button has not already been pressed
TO M0.4 // Store floor 2 button pressed status
SET Q0.5 // Turn on floor 2 indicator light
SET M1.1 // Set elevator stopped at floor 2 status

LD I0.2 // Check if floor 3 button is pressed
AN M0.5 // Check if floor 3 button has not already been pressed
TO M0.5 // Store floor 3 button pressed status
SET Q0.6 // Turn on floor 3 indicator light
SET M1.2 // Set elevator stopped at floor 3 status

LD I0.3 // Check if floor 4 button is pressed
AN M0.6 // Check if floor 4 button has not already been pressed
TO M0.6 // Store floor 4 button pressed status
SET Q0.7 // Turn on floor 4 indicator light
SET M1.3 // Set elevator stopped at floor 4 status

LD I0.4 // Check if elevator call button (up) is pressed
AN M0.7 // Check if elevator call button (up) has not already been pressed
TO M0.7 // Store elevator call button (up) pressed status
SET Q0.0 // Turn on elevator motor up

LD I0.5 // Check if elevator call button (down) is pressed
AN M0.7 // Check if elevator call button (down) has not already been pressed
TO M0.7 // Store elevator call button (down) pressed status
SET Q0.1 // Turn on elevator motor down

LD M1.0 // Check if elevator stopped at floor 1
AN M0.7 // Check if elevator call button (up) is pressed
TO M0.7 // Store elevator call button (up) pressed status
SET Q0.0 // Turn on elevator motor up

LD M1.3 // Check if elevator stopped at floor 4
AN M0.7 // Check if elevator call button (down) is pressed
TO M0.7 // Store elevator call button (down) pressed status
SET Q0.1 // Turn on elevator motor down

LD M1.0 // Check if elevator stopped at floor 1
AN M1.1 // Check if elevator stopped at floor 2
AN M0.7 // Check if elevator call button (up) is pressed
TO M0.7 // Store elevator call button (up) pressed status
SET Q0.0 // Turn on elevator motor up

LD M1.1 // Check if elevator stopped at floor 2
AN M1.2 // Check if elevator stopped at floor 3
AN M0.7 // Check if elevator call button (up) is pressed
TO M0.7 // Store elevator call button (up) pressed status
SET Q0.0 // Turn on elevator motor up

LD M1.2 // Check if elevator stopped at floor 3
AN M1.3 // Check if elevator stopped at floor 4
AN M0.7 // Check if elevator call button (up) is pressed
TO M0.7 // Store elevator call button (up) pressed status
SET Q0.0 // Turn on elevator motor up

LD M1.1 // Check if elevator stopped at floor 2
AN M1.0 // Check if elevator stopped at floor 1
AN M0.7 // Check if elevator call button (down) is pressed
TO M0.7 // Store elevator call button (down) pressed status
SET Q0.1 // Turn on elevator motor down

LD M1.2 // Check if elevator stopped at floor 3
AN M1.1 // Check if elevator stopped at floor 2
AN M0.7 // Check if elevator call button (down) is pressed
TO M0.7 // Store elevator call button (down) pressed status
SET Q0.1 // Turn on elevator motor down

LD M1.3 // Check if elevator stopped at floor 4
AN M1.2 // Check if elevator stopped at floor 3
AN M0.7 // Check if elevator call button (down) is pressed
TO M0.7 // Store elevator call button (down) pressed status
SET Q0.1 // Turn on elevator motor down

LD M1.0 // Check if elevator stopped at floor 1
AN I0.6 // Check if door closed limit switch is not triggered
TO M0.2 // Start door open timer
SET Q0.2 // Turn on door motor open

LD M1.1 // Check if elevator stopped at floor 2
AN I0.6 // Check if door closed limit switch is not triggered
TO M0.2 // Start door open timer
SET Q0.2 // Turn on door motor open

LD M1.2 // Check if elevator stopped at floor 3
AN I0.6 // Check if door closed limit switch is not triggered
TO M0.2 // Start door open timer
SET Q0.2 // Turn on door motor open

LD M1.3 // Check if elevator stopped at floor 4
AN I0.6 // Check if door closed limit switch is not triggered
TO M0.2 // Start door open timer
SET Q0.2 // Turn on door motor open

LD M0.2 // Check if door open timer has expired
AN I0.7 // Check if door open limit switch is not triggered
TO M0.2 // Reset door open timer
SET Q0.3 // Turn on door motor close

// End of program

以上程序仅供参考，具体实现方式可能因电梯类型和控制系统而异。请在实际应用中根据需要进行修改。