MAXIMUM FREQUENCY ANALOG OUTPUT

cody_master

Thanks.. there are a little ligth to resolve the problem.

Now. I can use  SET_CINT to setup OB30 on 200 Us. But the Analog output (SM1232) maybe can't it be fast.

Normally when we use the analog output we would use it as in the format of %IW64 or symbolically as "analogOutput1" for example.

Inside the interrupt you should add   [   :P  ] 
so that it becomes %IW64:P or "analogOutput1":P.
The   [   :P  ]   postfix forces the PLC to bypass the buffer
and immediately write to the physical output.

If the postfix is not there, the output will only be updated at the end of OB1 cycle.

Sorry for not mentioning this earlier.
w

cody_master

 I dont stand. Whats this [   :P  ]  .

Please explain this.

It is         :P           that is added to the input/output address.
(Ignore the [ ] brackets)
See the attachment for the official description.

The PLC cycle goes (roughly) like this...

Physical inputs   >>>    Input buffer

Execute PLC code

Output buffer  >>>   Physical outputs

When we read an input  as %I0.0 or read-write to %Q0.0, we are working with buffered values. This is done to ensure that the inputs and outputs stay unchanged throughout the PLC cycle. But if you wish to use the input/output directly, you can do so by adding the :P.

This idea applies also for analog inputs/outputs.

cody_master

yeah i understood now.

You arethe boss. great help. i try this and i'll comment after.

first i have to buy all equipments.

(big smile)  Thank you for the compliment.
(bigger smile + wink) Next time I'll bill you my full consulting fee.

(serious)  I have no guarantee that the system will do what you want from it. Again... make the supplier part of the solution - request if you could borrow some demo equipment to do your tests.

PLEASE post a movie somewhere of the results.. I would love to see it.

Good luck.
w

jaja. ok. if you want i could pay.
Brilliant!!       
Pay it forward  [link]  ....   help the next guy.

ok i upload a video when i finish.
Cool.