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Showing results 1 to 25 of 500 Search took 0.17 seconds. Search: Posts Made By: Peter Nachtwey

Forum: LIVE PLC Questions And Answers Today, 03:45 AM

Replies: 3 FactoryTalk View: Any workaround for 6-digit precision limit? Views: 156 Posted By Peter Nachtwey REALs only provide a little better than 6 digits... REALs only provide a little better than 6 digits precision. Some say 6.5. drbitboy is correct about using LREAL. Also, it is important to do any math operations in the correct order. As a General...

Forum: LIVE PLC Questions And Answers May 20th, 2022, 03:05 PM

Replies: 32 Online calculator for jerk-limited time-optimal trajectories Views: 8,943 Posted By Peter Nachtwey Did you look at this? ... Did you look at this? https://deltamotion.com/peter/wxMaxima/Seg1234567.html Notice the round off error for t07 at %t111. You must use 64 bit math for starters. The RMC75, RMC150 and RMC200 can...

Forum: LIVE PLC Questions And Answers May 18th, 2022, 11:35 PM

Replies: 9 Why I like ladder logic for boolean expressions Views: 681 Posted By Peter Nachtwey I am not a math genius. I am good but not that... I am not a math genius. I am good but not that good. I am at the point of "the more you know, the more you know you don't know".

Forum: LIVE PLC Questions And Answers May 18th, 2022, 09:56 PM

Replies: 9 Why I like ladder logic for boolean expressions Views: 681 Posted By Peter Nachtwey It is to me. It is as simple as factoring out C. ... It is to me. It is as simple as factoring out C. Also 20 years ago Terry Wood would show you how to use Karnaugh maps to simplify boolean equations. https://en.wikipedia.org/wiki/Karnaugh_map ...

Forum: LIVE PLC Questions And Answers May 17th, 2022, 01:04 PM

Replies: 32 Online calculator for jerk-limited time-optimal trajectories Views: 8,943 Posted By Peter Nachtwey What do you mean by jerk control? The jerk is... What do you mean by jerk control? The jerk is usually specified by the user. Codesys should implement the PLC Open motion libraries so you don't need to re-invent the wheel. Yes, this can...

Forum: LIVE PLC Questions And Answers May 16th, 2022, 11:01 PM

Replies: 13 How do I Convert Dec to Hex in a plc? Views: 575 Posted By Peter Nachtwey I SMH. This is so simple. Back in the '80s I... I SMH. This is so simple. Back in the '80s I did it like this. mov ch,4 ; assuming printing 4 hex characters of a 16 bit number rotate: mov cl,4 ; rotate 4 bits rol bx,cl...

Forum: LIVE PLC Questions And Answers May 14th, 2022, 11:37 AM

Replies: 25 VFD Not Consistently Ramping down Views: 1,556 Posted By Peter Nachtwey Extending the decel time ( distance ) just gives... Extending the decel time ( distance ) just gives the friction more time or distance to act on the same inertia/momentum. I don't see how this will make the deceleration more consistent UNLESS there...

Forum: LIVE PLC Questions And Answers May 13th, 2022, 04:06 PM

Replies: 32 Online calculator for jerk-limited time-optimal trajectories Views: 8,943 Posted By Peter Nachtwey I renamed the directory ... I renamed the directory https://deltamotion.com/peter/wxMaxima/Seg1234567.html However, that link does have much to do with 3rd order motion profiles. This one is better....

Forum: LIVE PLC Questions And Answers May 12th, 2022, 02:23 PM

Replies: 14 PID AB Stdio5000 Views: 1,086 Posted By Peter Nachtwey No! The pulse just bump the valve position open... No! The pulse just bump the valve position open or closed a little. Since the valves are motorized, they don't return to a null position like the servo valves you and I are familiar with.

Forum: LIVE PLC Questions And Answers May 12th, 2022, 11:00 AM

Replies: 14 PID AB Stdio5000 Views: 1,086 Posted By Peter Nachtwey Don't make the pulse lengths too long or try to... Don't make the pulse lengths too long or try to get the PV to the SP in one long pulse. It should take many pulses with enough time in between to let the system react. Another option is fixed...

Forum: LIVE PLC Questions And Answers May 11th, 2022, 04:24 PM

Replies: 14 PID AB Stdio5000 Views: 1,086 Posted By Peter Nachtwey Infer has not provided key information like what... Infer has not provided key information like what is really being controlled. What does voltage on Y1 mean? I am assuming it is just normal AC power and not proportional so the motor moves or...

Forum: LIVE PLC Questions And Answers May 6th, 2022, 11:14 AM

Replies: 31 Supply Chain issues with Drives , PLC Components , Motors , etc. Views: 4,773 Posted By Peter Nachtwey Our business is doing well because of our short... Our business is doing well because of our short lead times relative to our competitors. Where we are starting to get hurt is when the whole project is delayed due to lack of components like valves,...

Forum: LIVE PLC Questions And Answers April 29th, 2022, 07:02 PM

Replies: 8 Pide cascade hot water coil Views: 1,006 Posted By Peter Nachtwey Back from camping. I can see this thread went no... Back from camping. I can see this thread went no where.

Forum: LIVE PLC Questions And Answers April 25th, 2022, 01:21 PM

Replies: 8 Pide cascade hot water coil Views: 1,006 Posted By Peter Nachtwey Cascade control will work if you have control of... Cascade control will work if you have control of the hot water coils. I bet dead time is a major issue. The comment about the hot water coils holding heat is a giveaway. What is being heated? ...

Forum: LIVE PLC Questions And Answers April 22nd, 2022, 05:09 PM

Replies: 16 Hydraulic Fluid Level Detection. Views: 1,188 Posted By Peter Nachtwey They aren't switches. Some have resolution down... They aren't switches. Some have resolution down to 0.1 microns although that not necessary here. Here is an example....

Forum: LIVE PLC Questions And Answers April 22nd, 2022, 03:50 AM

Replies: 16 Hydraulic Fluid Level Detection. Views: 1,188 Posted By Peter Nachtwey The GEM, Temposonic or Balluff MDT rods will... The GEM, Temposonic or Balluff MDT rods will work. The Balluff and Temposonic rods work in oil all the time. I am pretty sure the GEM ones will too.

Forum: LIVE PLC Questions And Answers April 21st, 2022, 12:51 PM

Replies: 7 What to use to measure fine movements of press. Havent done this before Views: 568 Posted By Peter Nachtwey Yes! 1000 counts/rev is not very good. If a... Yes! 1000 counts/rev is not very good. If a cycle takes 4 seconds then that is only one count every 4 milliseconds. BTW, Gasbarre uses our controllers. All their camming is done electronically....

Forum: LIVE PLC Questions And Answers April 19th, 2022, 04:16 PM

Replies: 35 Motion Dirrect Commands Views: 4,784 Posted By Peter Nachtwey Yes, no trend. Yes, no trend.

Forum: LIVE PLC Questions And Answers April 16th, 2022, 01:32 PM

Replies: 35 Motion Dirrect Commands Views: 4,784 Posted By Peter Nachtwey What? Yes, Are you dealing in two or three dimensional space? The motion controllers usually just take scalar numbers for each axis. Position can be negative depending on the coordinate system....

Forum: LIVE PLC Questions And Answers April 13th, 2022, 11:20 AM

Replies: 7 Powerflex 525 Rotate Autotune Views: 777 Posted By Peter Nachtwey So is there a second part where the load is taken... So is there a second part where the load is taken into account?

Forum: LIVE PLC Questions And Answers April 13th, 2022, 01:31 AM

Replies: 7 Powerflex 525 Rotate Autotune Views: 777 Posted By Peter Nachtwey It doesn't make any sense to me to tune the... It doesn't make any sense to me to tune the system up without the load.

Forum: LIVE PLC Questions And Answers April 9th, 2022, 04:13 AM

Replies: 15 Siemens s7 to Ethernet IP devices Views: 6,159 Posted By Peter Nachtwey Wouldn't something like a Red Lion Data Station... Wouldn't something like a Red Lion Data Station be the easiest/cheapest way to go?

Forum: LIVE PLC Questions And Answers April 7th, 2022, 07:14 PM

Replies: 1 Microsoft's Quick Assist Views: 490 Posted By Peter Nachtwey Microsoft's Quick Assist Does anybody use for remote tech support? Quick Assist, QA, comes with Windows 10 and 11 so it is "free" QA uses HTTPS for security but I wonder how many companies even block that. QA is...

Forum: LIVE PLC Questions And Answers April 7th, 2022, 12:36 PM

Replies: 25 s-curve math? Views: 23,001 Posted By Peter Nachtwey Most people use that for ramping velocity set... Most people use that for ramping velocity set points. Your solution results in a parabolic like velocity profile, not a ramp to a constant speed or down to a constant speed. Yes, it works...

Forum: LIVE PLC Questions And Answers April 6th, 2022, 10:50 PM

Replies: 25 s-curve math? Views: 23,001 Posted By Peter Nachtwey Your solution ramps up and then down. is f(frac) a position or velocity? It looks like you assumed it is a position so your solution ramps up and down since the velocity is 0 at both ends. Usually people want to start with a velocity...

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