Simple program with one second delay

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1

Hello! I want to make a simple program that turns on all the LEDs on a digital output with a delay of one second, but I’m having problems creating the delay, in the attached pictures I’ll show you how I tried to do it.

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Here I tried to make a start loop only for DO1, but I get an error even on END_IF.

2

Hello, I had an issue similar to yours recently where I meant to add a structured text file but I added an automation basic file by mistake. It looks like yours is an Automation Basic file based on the error and green semicolons. The END_IF is structured text whereas ENDIF is used in Automation Basic.

3

Hello,

Here is an example you can use to understand how to use timers.
The program below will turn on LEDs with a delay of one second between each, assuming you have multiple LEDs connected to digital outputs.

//Declaration
VAR
    DO_1 : BOOL;
    DO_2 : BOOL;
    DO_3 : BOOL;

    timer_1 : TON;
    timer_2 : TON;
    timer_3 : TON;
END_VAR

PROGRAM _INIT
    //Set timers
    Timer_1(IN := NOT Timer_1.Q, PT := T#1s); // 1 second delay for LED1
    Timer_2(IN := Timer_1.Q AND NOT Timer_2.Q, PT := T#1s); // 1 second delay for LED2
    Timer_3(IN := Timer_2.Q AND NOT Timer_3.Q, PT := T#1s); // 1 second delay for LED3

    // Output
    IF Timer_1.Q THEN
        DO_1 := TRUE;
    END_IF;

    IF Timer_2.Q THEN
        DO_2 := TRUE;
    END_IF;

    IF Timer_3.Q THEN
        DO_3 := TRUE;
    END_IF;
PROGRAM _EXIT

You can adapt the program by adding more outputs (LEDs), and by changing the condition in the IN := … of the timer. You can change the time delay in the PT := …

For more details about TON() function, check B&R help → B&R Online Help (br-automation.com)

Best regards,
Mohammed Ali

4

I have error on the var.
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5

The VAR part must not be part of your program! It’s the content of the .var file!

6

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PROGRAM _INIT

DO_1 := FALSE;
DO_2 := FALSE;
DO_3 := FALSE;
DO_4 := FALSE;
DO_5 := FALSE;
DO_6 := FALSE;
DO_7 := FALSE;
DO_8 := FALSE;
DO_9 := FALSE;
DO_10 := FALSE;
DO_11 := FALSE;
DO_12 := FALSE;

END_PROGRAM

PROGRAM _CYCLIC

//Set timers
Timer_1(IN := NOT Timer_1.Q, PT := T#1s); // 1 second delay for LED1
Timer_2(IN := Timer_1.Q AND NOT Timer_2.Q, PT := T#1s); // 1 second delay for LED2
Timer_3(IN := Timer_2.Q AND NOT Timer_3.Q, PT := T#1s); // 1 second delay for LED3

// Output
IF Timer_1.Q THEN
	DO_1 := TRUE;
	ENDIF;

	IF Timer_2.Q THEN
		DO_2 := TRUE;
		ENDIF;

		IF Timer_3.Q THEN
			DO_3 := TRUE;
			ENDIF;

END_PROGRAM

PROGRAM _EXIT
// Cod pentru ie?ire
END_PROGRAM

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7

You need to add the library standard to your project to be able to Build your program.
Take a look at this sample

Note : this program was made with StructuredText.

ledDelay.zip (55.7 KB)

8

your ENDIF looks like Automation Basic but the fb call like Structured Text. So which language do you prefer ?

find the syntax for AB here:
https://help.br-automation.com/#/en/4/libraries%2Fstandard%2Fsamples%2Fab%2Fex_ab_ton.html