Unity Pro Delay?

mosama · Nov 24, 2010

Hi every one

I'm working with Unity Pro software for programming Schneider PLC. I want to make a delay using ST language. I don't mean on delay timer, I mean the program execution stops until delay is counted then the program continues.

I hope any one can help me.

Regards

GeoffC · Nov 24, 2010

Why would you want to stop the program execution?

robertkjonesjr · Nov 24, 2010

You can stop any particular task section on a permissive - if you right click on the task section (see picture) and go to Properties->Condition you can add a bool in here to enable/disable this code section. I think this is what you want - I don't think you mean to turn the whole system off.

This way, you can have a Timer or whatever else in some master task and then enable/disable the code you want to run/stop as you see fit with the permissive bit.

mosama · Nov 24, 2010

Thanks for you replies

Actually I want to make a function block with the following I/O:
Inputs: 1- Start
2- NUM OF OUTS
3- Delay
Outputs: Array [1..10] of OUTS

When start is on out1 will be on then after a delay out2 goes on then delay then out3 ... and so on

I want to make a for loop like this

for x:=1 to 10 do
out[x]:=1;
(* delay here *)
end_for;

Regards

mosama · Nov 25, 2010

Any ideas?

tragically1969 · Nov 25, 2010

I cant see any valid reason why you wouldn't just use a timer delay, trying to do it any other way is just re-inventing the wheel for the sake of it.

mosama · Nov 25, 2010

Because the timer delay instruction requires several scans to execute the delay. I want the delay to be executed in on scan so it can be used in a for loop.

chud · Nov 25, 2010

this sounds like going back to pic programming

tragically1969 · Nov 26, 2010

Which processor are we talking about here ?

Could you not use a fast task and control the speed of the scan ?

mosama · Nov 27, 2010

chud:
That's exactly what I want, the delay instruction in the PIC microcontroller.

tragically1969:
M340 BMX P34 2020 V2

mosama · Nov 28, 2010

Any ideas for making a delay inside a for loop?

iknowsomeplc · Nov 28, 2010

You can easily create delay inside an ST section by using REPEAT instruction.

example
x := -1
REPEAT
x := x + 2
UNTIL x >= 101
END_REPEAT ;

Important Note: This will create a loop program and may cause WatchDog error to stop the PLC, if the total scan tim even exceeds the watchdog time. So it is not recommended to use this instruction for your appliation requirement. Your requirment can be better done using TON block.

iknowsomeplc · Nov 28, 2010

By creating a DFB with an ST code inside is an easy solution.
Working code shown in attachments.

mosama · Nov 28, 2010

iknowsomeplc:
Thanks for your help.
If there is a delay instruction it could be better.

Unity Pro Delay?

mosama

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tragically1969

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