How to declare an array and use it in LAD

Muhammad Haris

Thank you for the Link but I can see the processing of data in SCL there. Can you share some help manual for using array in LAD? Can't really get some good help on web for that

Muhammad Haris

Can you share the example with real memory address please? I am trying to write MW0[0] but this is an error. Thank you

Muhammad Haris

Thank you for the support. How can the same be implemented in OB 1 directly using thr array as actual memory adress?

Arrays can be created in the block interface editors for OB, FC, FB, and DB.
You cannot create an array in the PLC tags editor.

I found this post as I was looking for a solution for my application. 

here is a small explanation for the same.  is there any one who can help me with this. 

I have a sensor at say x place which detectors an error which is a color defect. I have a spray gun at 800mm after the defect is detected.

My application is to detect the defect and spray at that place after 800mm. if defect is after every 1 mm then I need to lodge that every input received from sensor and spray at every 1 mm after 800mm.

My encoder's 1 pulse is equal to 1 mm.

so my logic was something like this. I detect the fault signal initially and  set a bit of DB4 say db4.dbx0.1 , so now at a fault db4.dbx0.1 will be 1, later, after every pulse of encoder(means after every mm) I shift the bit to next address so after 800 pulses(800mm) it will reached to dbd4.dbx5.7(assuming). Later I constantly compare dbd4.dbx5.7 with 1 and if it is 1 i will spray at that location.

so for full logic I need pulses. and with fm450-1 I only get counts. Later  I found a way to convert the count into pulse format.

So I will go back to what my logic was.My question is

I want to shift the data from one db address to next address i.e I want the data in DB4.dbw0 to be moved to DB4.dbw2 at pulse no 1, then at pulse number 2 I want the data from DB4.dbw2 to be moved to DB4.dbw6 so on till DB4.dbw300.

So if DB4.dbw0 had value 100 in it, then after 300 pulses that value must be in address DB4.dbw300. means after 300 pulses DB4.dbdw300 must contain 100.

I tried using shift operation but cannot work with that. Is there any other way to do this using ladder programming in TIAv13 sp1

PS - CPU415pndp - DI32X2 - D016X4 - 8chAIX1 - 8chA0X1 - FM450-1

Please feel free to ask any other details.

What is CPU415?

However, I presume that your CPU can be programmed with TIA.

So, it's high time you left absolute addressing aside.

Create an FB in the SCL language. In the interface define static array of bools. Use FOR loop to "shift" the array.