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Showing results 1 to 25 of 500
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Search: Posts Made By: Peter Nachtwey
Forum: LIVE PLC Questions And Answers Yesterday, 08:30 PM
Replies: 25
Views: 1,031
Posted By Peter Nachtwey
Some Ancient History and the nitty gritty.

ditto



Just about any compiler that will generate assembly code will let you see what is under-the-hood. I definite recommend looking at the generated assembly code.

Way back in the 1970s I...
Forum: LIVE PLC Questions And Answers January 19th, 2019, 05:29 PM
Replies: 25
Views: 1,031
Posted By Peter Nachtwey
The last time I looked, C was not object...

The last time I looked, C was not object oriented. You can almost make it so by creating structures with pointers to methods. However, when you create a new instance of a structure for and new...
Forum: LIVE PLC Questions And Answers January 18th, 2019, 10:27 PM
Replies: 12
Views: 777
Posted By Peter Nachtwey
I have an employee that use to ask me to swim...

I have an employee that use to ask me to swim with him because he thought he could swim faster than me. He would surf and skin dive. I do neither. He just wanted me to the sacrificial anode...
Forum: LIVE PLC Questions And Answers January 18th, 2019, 11:07 AM
Replies: 24
Views: 1,246
Posted By Peter Nachtwey
Why keep this a secret? I hate wasting time...

Why keep this a secret? I hate wasting time asking questions.


Yes, a few of the people on this forum have been to our advanced training.
The video is long and unrefined. Watch till you get...
Forum: LIVE PLC Questions And Answers January 18th, 2019, 12:13 AM
Replies: 25
Views: 1,031
Posted By Peter Nachtwey
Recommend learn C if you want to write embedded...

Recommend learn C if you want to write embedded code for PLCs, motion controller, temperature controllers etc.
I would learn C# for writing HMIs but I am not a fan of C# because it is MUCH slower...
Forum: LIVE PLC Questions And Answers January 11th, 2019, 07:59 PM
Replies: 38
Views: 2,500
Posted By Peter Nachtwey
Latching and unlatching should be instantaneous....

Latching and unlatching should be instantaneous. Think of what would be happening in assembly language. The only problem I see with latching and unlatching bits is that it is a read-modify write...
Forum: LIVE PLC Questions And Answers January 11th, 2019, 07:45 PM
Replies: 24
Views: 1,246
Posted By Peter Nachtwey
You are right. It doesn't. It is just an...

You are right. It doesn't. It is just an example of how the inner and outer loops can have different units.


Yes again, but I don't think your example as being "reversed"


I find this hard...
Forum: LIVE PLC Questions And Answers January 11th, 2019, 04:24 PM
Replies: 24
Views: 1,246
Posted By Peter Nachtwey
Aaarrrggghhhh!!!!? Let snuff out that direct...

Aaarrrggghhhh!!!!?
Let snuff out that direct and indirect feedback stuff right now.
It is usually best that the feedback units are the same as the setpoint units but that doesn't need to be the...
Forum: LIVE PLC Questions And Answers January 9th, 2019, 12:33 PM
Replies: 6
Views: 364
Posted By Peter Nachtwey
Sticky cylinders from impure air will be the...

Sticky cylinders from impure air will be the biggest problem if the cylinders are smooth to begin with.
If the actuators are only going from end to end it isn't a big deal but if you are trying to...
Forum: LIVE PLC Questions And Answers January 9th, 2019, 03:09 AM
Replies: 6
Views: 364
Posted By Peter Nachtwey
I do my calculations relative to absolute 0. ...

I do my calculations relative to absolute 0. Even air at half an atmosphere can be compresses to be many times a atmosphere. Usually the pressure will go below atmospheric when decelerating...
Forum: LIVE PLC Questions And Answers December 30th, 2018, 09:58 PM
Replies: 58
Views: 4,295
Posted By Peter Nachtwey
Dilbert: The Knack

So that funny but.... I have referenced this several times.
https://www.youtube.com/watch?v=1zVXC84KzL8
We have Dilbert calendars at work
Forum: LIVE PLC Questions And Answers December 28th, 2018, 02:15 PM
Replies: 9
Views: 831
Posted By Peter Nachtwey
The point is "What do you want to read?" The...

The point is "What do you want to read?"
The schedule will be for about 1 article for every 6 weeks. I will need suggestions.

Jack Johnson like to write about the modeling pumps and valves.
I...
Forum: LIVE PLC Questions And Answers December 28th, 2018, 02:31 AM
Replies: 9
Views: 831
Posted By Peter Nachtwey
I will be replacing Jack Johnson

Hydraulics and Pneumatics magazine has chosen me to be the ne technical contributor. I will be replacing Jack Johnson that wants to concentrate on modeling hydraulic pumps.

Jack and I were in...
Forum: LIVE PLC Questions And Answers December 23rd, 2018, 02:34 PM
Replies: 24
Views: 2,134
Posted By Peter Nachtwey
Something new and challenging then see it in...

Something new and challenging then see it in operation.
Like like simulations and control theory.
Forum: LIVE PLC Questions And Answers December 20th, 2018, 04:12 PM
Replies: 37
Views: 2,443
Posted By Peter Nachtwey
Widelto, hydraulic actuators tend to extend much...

Widelto, hydraulic actuators tend to extend much faster than retracting as long as the pressure remains relatively constant. Therefore it takes a smaller control signal to extend than retract if...
Forum: LIVE PLC Questions And Answers December 14th, 2018, 03:20 PM
Replies: 4
Views: 281
Posted By Peter Nachtwey
Sorting or singulating? There is a difference. ...

Sorting or singulating? There is a difference. In the US and Canada the logs aren't normally sorted according to diameter whereas in Europe the longs are scanned and sized to 20 mm groups. In AU...
Forum: LIVE PLC Questions And Answers December 13th, 2018, 09:29 PM
Replies: 25
Views: 830
Posted By Peter Nachtwey
Yes, yes, yes! but that knowledge is way beyond...

Yes, yes, yes! but that knowledge is way beyond what a typical PLC programmer would know. This problem would be a good for for senior college students or even graduate student.




OK, but...
Forum: LIVE PLC Questions And Answers December 13th, 2018, 03:50 PM
Replies: 25
Views: 830
Posted By Peter Nachtwey
Dead time can be a huge problem. You said your...

Dead time can be a huge problem.
You said your system is MUCH bigger than the other one that is running. The thermal mass of your system can be much larger so the response will be much slower.
...
Forum: LIVE PLC Questions And Answers December 12th, 2018, 11:53 AM
Replies: 17
Views: 918
Posted By Peter Nachtwey
I think Mispeld is close. 1 before shifting the...

I think Mispeld is close.
1 before shifting the working copy of 63 DINTS, copy them to a queue or ring buffer.

2. shift the bits in the working copy.

3. Now 'OR' the working copy and the...
Forum: LIVE PLC Questions And Answers December 12th, 2018, 06:29 AM
Replies: 46
Views: 2,683
Posted By Peter Nachtwey
I have seen small table that you strap on over...

I have seen small table that you strap on over your shoulder. It holds the laptop and is very portable. I have also see small table that connect to the safety rails around the machery. This was...
Forum: LIVE PLC Questions And Answers December 11th, 2018, 06:42 PM
Replies: 33
Views: 1,580
Posted By Peter Nachtwey
The equation with the ⍺ and β is the desired...

The equation with the ⍺ and β is the desired characteristic equation and it has 3 poles just like the actual characteristic equation. The values of ⍺ and β can be chosen so the error decays as...
Forum: LIVE PLC Questions And Answers December 11th, 2018, 06:25 PM
Replies: 33
Views: 1,580
Posted By Peter Nachtwey
This is an excellent observation. There is no...

This is an excellent observation.
There is no standard method of determining the best pole locations. Schools teach root locus but they don't say anything about what the best gain should be.

So...
Forum: LIVE PLC Questions And Answers December 11th, 2018, 02:50 PM
Replies: 33
Views: 1,580
Posted By Peter Nachtwey
Kp is the proportional gain Gc(s) is the...

Kp is the proportional gain
Gc(s) is the Laplace formula for the controller which consists only of the proportional gain.
Ga(s) is the Laplace transform for the open loop transfer function for the...
Forum: LIVE PLC Questions And Answers December 11th, 2018, 02:17 PM
Replies: 33
Views: 1,580
Posted By Peter Nachtwey
This is why I need to find someone that can...

This is why I need to find someone that can verify the calculations in the pdf I posted above. Salesmen lie whenever their mouth is moving. Especially in China. I can provide irrefutable proof...
Forum: LIVE PLC Questions And Answers December 11th, 2018, 01:59 AM
Replies: 33
Views: 1,580
Posted By Peter Nachtwey
If this pretty enough? Green on blue? People...

If this pretty enough? Green on blue? People tend to like green for good and red for bad. Bugs might like that blue light.


Seriously, someone must know this stuff to provide the tools that...
Showing results 1 to 25 of 500

 
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