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Search: Posts Made By: Peter Nachtwey
Forum: LIVE PLC Questions And Answers August 4th, 2020, 11:30 PM
Replies: 9
Views: 328
Posted By Peter Nachtwey
It is possible. Delta Tau has a reputation for...

It is possible. Delta Tau has a reputation for high end motion control and the difference between a PLC and motion controller can become blurred. For instance our controller is often used stand...
Forum: LIVE PLC Questions And Answers August 4th, 2020, 07:40 PM
Replies: 9
Views: 328
Posted By Peter Nachtwey
Omron bought out Delta Tau Data Systems. Omron...

Omron bought out Delta Tau Data Systems. Omron has motion control cards.


@0949er, time and materials is the way to go.

The problem is that writing the target generator takes a lot of work...
Forum: LIVE PLC Questions And Answers August 4th, 2020, 10:19 AM
Replies: 9
Views: 328
Posted By Peter Nachtwey
Another disaster waiting to happen. You need to...

Another disaster waiting to happen. You need to use a servo controller.
I wrote some threads a year or two back saying why using PLCs directly is not a good idea.


Your customer has no idea. I...
Forum: LIVE PLC Questions And Answers August 3rd, 2020, 11:29 AM
Replies: 22
Views: 978
Posted By Peter Nachtwey
Yes, but it could easily just print out on a...

Yes, but it could easily just print out on a monitor line by line.


Back in the dark ages I programmed and debug 8086/80186 assembly language. My favorite debugger just displayed on a terminal...
Forum: LIVE PLC Questions And Answers August 3rd, 2020, 02:24 AM
Replies: 22
Views: 978
Posted By Peter Nachtwey
One way be be to use something like our event...

One way be be to use something like our event log. You specify what you want to look at and it logs or prints it out in real time.
Obviously what you want to look at be be only what is necessary at...
Forum: LIVE PLC Questions And Answers August 2nd, 2020, 11:26 PM
Replies: 22
Views: 978
Posted By Peter Nachtwey
I can understand the need. Most PLC IDEs are...

I can understand the need. Most PLC IDEs are horribly inefficient because one must take their hands off the key board to grab mouse, click on something then go back to the key board.


I...
Forum: LIVE PLC Questions And Answers August 2nd, 2020, 02:54 PM
Replies: 13
Views: 1,036
Posted By Peter Nachtwey
Years ago the former president of Red Lion posted...

Years ago the former president of Red Lion posted a long rant here about paying UL extortion fees for each of his devices. I can't find that rant but I agree. We must also pay these extortion fees...
Forum: LIVE PLC Questions And Answers August 1st, 2020, 10:04 AM
Replies: 10
Views: 743
Posted By Peter Nachtwey
This will do. ...

This will do.
http://deltamotion.com/pdf/vc2124.pdf
There are two channels. Each one of driving up to +/- 100 ma but can be configured in 10ma increments.
Normally the input is a voltage but it...
Forum: LIVE PLC Questions And Answers July 31st, 2020, 01:07 PM
Replies: 36
Views: 2,230
Posted By Peter Nachtwey
This is making more sense now. At first there...

This is making more sense now. At first there was talk of a VFD and changing speeds. The motor efficiency would change as a function of speed. Now the speed appears to be fixed at 60Hz. So is...
Forum: LIVE PLC Questions And Answers July 28th, 2020, 11:54 PM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
I realize that. I don't know how I missed this...

I realize that. I don't know how I missed this thread 15 years ago. I certainly knew about LFSRs back them since I used them about 28-30 years ago. I wasn't aware of George Marsaglia back then. ...
Forum: LIVE PLC Questions And Answers July 28th, 2020, 08:13 PM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
Define what is incorrect for any application? ...

Define what is incorrect for any application?



Two BSLs or BSRs are required only if a new random number is needed every scan. They would alternate shifting bits because a one shot is...
Forum: LIVE PLC Questions And Answers July 28th, 2020, 09:25 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
Moving all the bits one bit position per scan is...

Moving all the bits one bit position per scan is that is required.
The every other scan part is a limitation but there are ways around that. Use 2 if a new random number is required every scan.
Forum: LIVE PLC Questions And Answers July 28th, 2020, 12:55 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
Why 16 BSR? Can't one BSR or BSL shift 64 bits...

Why 16 BSR? Can't one BSR or BSL shift 64 bits in one scan?
I thought this was the whole purpose of the BSL and BSR blocks, to keep track of things on a conveyor or similar. I could not see a...
Forum: LIVE PLC Questions And Answers July 27th, 2020, 09:53 PM
Replies: 10
Views: 749
Posted By Peter Nachtwey
Pressure regulators don't work because they only...

Pressure regulators don't work because they only regulate the pressure on one side. There is usually opposing pressure on the other side of the piston.
The load cell is the most accurate way to...
Forum: LIVE PLC Questions And Answers July 27th, 2020, 09:57 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
That is all that is needed. I didn't see a limit...

That is all that is needed. I didn't see a limit to the number of bits that could be shifted.
Forum: LIVE PLC Questions And Answers July 26th, 2020, 09:08 PM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
That would be random enough for most purposes but...

That would be random enough for most purposes but doesn't any body want a real solution? The SLC5 has a BSL, BSR and XOR blocks.
Forum: LIVE PLC Questions And Answers July 26th, 2020, 01:32 PM
Replies: 10
Views: 749
Posted By Peter Nachtwey
This is usually a mistake. You will waste a lot...

This is usually a mistake. You will waste a lot of time and still not achieve what you want to do. A lot of people insist on using a PLC and eventually give up. Some are stubborn and live with...
Forum: LIVE PLC Questions And Answers July 26th, 2020, 01:34 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
I understand that. The problem is that the seed...

I understand that. The problem is that the seed only starts the sequence of pseudo random numbers at a different spot.





Random number generators in a PLC and motion controllers are good for...
Forum: LIVE PLC Questions And Answers July 25th, 2020, 11:11 PM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
It is the algorithm that is important. Some...

It is the algorithm that is important. Some assembly may be required.




Do an internet search for "random number generator PLC5". All you get it this thread. There aren't any PLC5 random...
Forum: LIVE PLC Questions And Answers July 23rd, 2020, 10:18 PM
Replies: 36
Views: 2,230
Posted By Peter Nachtwey
What is the OP's or his customer's definition of...

What is the OP's or his customer's definition of efficiency?
There is efficiency of the pump's motor
The efficiency of the pump.
Then there is the problem of maximizing the area in the rectangle...
Forum: LIVE PLC Questions And Answers July 23rd, 2020, 11:19 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
Doesn't a PLC5 have a bit shift block where many...

Doesn't a PLC5 have a bit shift block where many bits can be shifted at once? ANDing with 65535 simply means separating a 32 bit value into two 16 bit ones and treating them like an unsigned number.
Forum: LIVE PLC Questions And Answers July 23rd, 2020, 11:13 AM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
Be practical. Although any pattern will...

Be practical. Although any pattern will eventually be repeated there are some that won't happen in a life time or while the earth still exists.
A lava lamp with an analog output? Give me a break. ...
Forum: LIVE PLC Questions And Answers July 23rd, 2020, 12:43 AM
Replies: 36
Views: 2,230
Posted By Peter Nachtwey
Norm, Tom is right about the pump. One can tell...

Norm, Tom is right about the pump. One can tell by the pump curve.

YES! I point out below how one can determine the power. Throttling waste energy. I have said that above. So one only needs to...
Forum: LIVE PLC Questions And Answers July 22nd, 2020, 02:25 PM
Replies: 36
Views: 2,230
Posted By Peter Nachtwey
your example is not the same. The...

your example is not the same.




The pump manufacturer only has control of the pump curves. The pump manufacturer can increase the area under the pump curve by changing the speed. That is one...
Forum: LIVE PLC Questions And Answers July 22nd, 2020, 12:51 PM
Replies: 69
Views: 9,209
Posted By Peter Nachtwey
This is what I use. ...

This is what I use.
https://www.codeproject.com/Articles/25172/Simple-Random-Number-Generation
Showing results 1 to 25 of 500

 
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