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Thank you, thank you, thank you!!!!
Hi Carl,
Thank you so much for the help. The delay and waveform are just what I'm after. I take it that V1 and V2 are actually where I would make the input and output connections? I haven't had a chance to study it yet, but that was my first...
Thanks Carl,
The CMOS op-amp definitely sounds like more the way to go? I just tried playing around with the RC circuit schematic using LTspice, but I couldn't get more than a few milliseconds delay, no matter what values I tried. I was hoping for a decent lag and then a good...
Eric,
I thought I had just sent you a reply, but I don't see it up here. Did you get the one giving the details of the actual vessel size in the real process, and a question about an op-amp based circuit to simulate a large capacitance? Thanks...
Hi Carl,
Yes, I have been thinking about that. I haven't yet worked out exactly what size capacitors I would have to use, but I guess they would be pretty big? Unfortunately this control system is analogue, so a step change delay would just give that: a delayed step. The real...
Common Ground
Hi Eric,
Thank you very much for your reply. Yes, the two 0V do have a common return. as for the filtering, I am thinking that this may not be exactly what I want? The process this is to simulate could have a lag of up to 1 hr? If I use a resistor ahead of the...
I have an application where I want to test a PLC programme. In the past, working with DCS systems, I have used process simulators that had been built by the companies I worked for. The principle is that an analogue output which would normally go to say a control valve, is filtered to simulate a...
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