Time out on toolchange

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emcPT
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Platinum Member

07 Apr 2016 17:23 #72923 by emcPT

Time out on toolchange was created by emcPT

Hello,

In a tool change component when something goes wrong a time out is normally present on machines that indicates that the tool change went wrong.

How can a time out be accomplished inside a component ? For example if the tool change does not occur in 10 seconds it should enter in error.

Thank you

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BigJohnT
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07 Apr 2016 22:10 - 07 Apr 2016 22:12 #72934 by BigJohnT

Replied by BigJohnT on topic Time out on toolchange

I do my tool change in Classicladder so timers are easy.

I think (guess) you could make a timer of some sort in a component maybe counting cycles or something. Oh take a look at the time component it tracks time.

Edit: and look at the timedelay component.

JT

Last edit: 07 Apr 2016 22:12 by BigJohnT.

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andypugh
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08 Apr 2016 12:09 - 08 Apr 2016 12:09 #72954 by andypugh

Replied by andypugh on topic Time out on toolchange

emcPT wrote:
How can a time out be accomplished inside a component ?

You mean inside a realtime HAL component?

Typically a HAL component is written as a state machine:

state = 0;
switch state{
case 0: // idle
   if (thing) {
      stuff;
     state = 1
   }
case 1: // begin
   if (other thing){
      more_stuff
     state = 2
...

and so on.

To add a timeout:

state = 0;
switch state{
case 0: // idle
   if (thing) {
      stuff;
    timer = 0;
     state = 1
   }
case 1: // begin
   timer += period; // period is in nS
   if (timer > 1000000) {
       state = 99;
      break
   }
   if (other thing){
      more_stuff
     timer = 0
     state = 2
...
  case 99:  // Handle timeout heree

Last edit: 08 Apr 2016 12:09 by andypugh.

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emcPT
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08 Apr 2016 16:17 #72968 by emcPT

Replied by emcPT on topic Time out on toolchange

Yes, we implemented like a delay (that we were using in another machines) and quite similar to your implementation and it works fine.

About the classicladder I never tested as we are able to do almost anything with components.

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