Greetings Mr. O'Reilly
The 22ns you refer to is switching time of the output
chip. What would be meaningful is response time from
an input to the port and the corresponding output
after processing time.
Of course all of it will be very quick compared to
the response time of a heater. I think
If you use a 90MHz PC, the instruction cycle time could be around 11ns
and faster for higher speeds so if you use a basic DOS or Linux without
Windows and something like Turbo C, which should optimise your code, you
would get very rapid processing and be limited only by your transducer
Hi everyone,
For those of you who are working on your process control for ethanol/methanol
or biodiesel production, I was wondering about something.
I hate to send anything to the land fill or scrap yard that I might be able to
use later and I'm sure you feel the same way. This philosophy
A temperature controller that would not upset because
of lightning or other power line disturbance and would
not lose its settings with power supply failure may
prove superior especially if less expensive.
Thus a bimetal strip may prove best in the long run.
I am in favor of data logging and
OK Kirk.
Thanks for the reply.
I have a couple of follow-up questions:
First, Is accuracy of your temperature set points (or other I/O) a critical
issue for controlling a process? Because, a PID or Smith compensator control
can give you far better control of your process than a bi-metallic
Subject: Re: [Biofuel] Attn. Pack Rats -- (maybe) A cheap Process Control Idea
Hi everyone,
...
I was thinking of developing generic software (in C or assembler) for old
computers to convert them into process controllers. For example, it might make
an effective temperature controller for your
Computers are great. I like them. But they aren't as
reliable as simple physical systems. As for the delta
T a bimetal can operate over it is a question of
mechanical design. An electronic controller may
theoretically switch over a change of a milli degree
but in the real world the conductivity
yet but I'd be delighted to give you as much info as I have on
controlling parallel ports and my limited knowledge of Turbo C.
Paddy.
DHAJOGLO wrote:
Subject: Re: [Biofuel] Attn. Pack Rats -- (maybe) A cheap Process Control Idea
Hi everyone,
...
I was thinking of developing generic
always a rush of adrenalin when you run your own program and wait in
anticipation to see if your programming skills don't blow up your
basement ;o)
Kirk McLoren wrote:
Computers are great. I like them. But they aren't as
reliable as simple physical systems. As for the delta
T a bimetal can
Kirk,
Well, again, I don't think your logic is off base -- especially when it comes
to redundancy in control systems.
There are ways to approach each of the situations you described in your reply.
I worked as a control engineer for a few years and wrote computer logic
(typically 0 to 20 mA
Right on!
I knew that I couldn't possibly be the first person to think of this. I just
didn't know where to look.
I will definitely keep you informed of any progress.
Thanks.
Mike
DHAJOGLO [EMAIL PROTECTED] wrote:
Subject: Re: [Biofuel] Attn. Pack Rats -- (maybe) A cheap Process Control
on
controlling parallel ports and my limited knowledge of Turbo C.
Paddy.
DHAJOGLO wrote:
Subject: Re: [Biofuel] Attn. Pack Rats -- (maybe) A cheap Process Control Idea
Hi everyone,
...
I was thinking of developing generic software (in C or assembler) for old
computers to convert them into process
on
controlling parallel ports and my limited knowledge of Turbo C.
Paddy.
DHAJOGLO wrote:
Subject: Re: [Biofuel] Attn. Pack Rats -- (maybe) A cheap Process Control
Idea
Hi everyone,
...
I was thinking of developing generic software (in C or assembler) for old
computers to convert them
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