lostcontrol
Lifetime Supporting Member
Hi Folks,
We have a client with an application that will potentially have analogue values changing at micro-seconds rates. They are wanting to know what the dv/dt of these signals are, at all times, even though, if we end up selecting a PLC, we would not be able to act on these signals faster than the PLC's scan time.
What I was wanting to ask the forum, is some recomendations on PLC's with fast scan/analogue sampling times, or even some micro-controllers that would potentially be capable of this task?
So far, I have quickly compared the Modicon M340 & Omron CJ2 ranges, & it does seem that the Omron range has faster rates, in both CPU & analogue conversion time.
I have heard that some of the Siemens processors are pretty fast, & am about to look at the Rockwell range also.
We have thought about a motion controller, but don't need any of the axis control features etc, but it still may be an option due to the superior features they can provide.
The basic specs are:
8x AI
20x DI
20x DO
Any suggestions, perhaps even on micros would be appreciated. (I have been trying to find the recent thread on micro's, but cannot remember it's title...)
Cheers
We have a client with an application that will potentially have analogue values changing at micro-seconds rates. They are wanting to know what the dv/dt of these signals are, at all times, even though, if we end up selecting a PLC, we would not be able to act on these signals faster than the PLC's scan time.
What I was wanting to ask the forum, is some recomendations on PLC's with fast scan/analogue sampling times, or even some micro-controllers that would potentially be capable of this task?
So far, I have quickly compared the Modicon M340 & Omron CJ2 ranges, & it does seem that the Omron range has faster rates, in both CPU & analogue conversion time.
I have heard that some of the Siemens processors are pretty fast, & am about to look at the Rockwell range also.
We have thought about a motion controller, but don't need any of the axis control features etc, but it still may be an option due to the superior features they can provide.
The basic specs are:
8x AI
20x DI
20x DO
Any suggestions, perhaps even on micros would be appreciated. (I have been trying to find the recent thread on micro's, but cannot remember it's title...)
Cheers