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JamesHoward wrote:

Mecanix: What sim are you using? I cant seem to find something decent AND has a full library.... It has been years since I tried LTSpice, has it gotten better?

Keep in mind (not that I expect you to know) that I am using a +-6 volt signal to run the yaskawa drives on their input 1. (I have my reasons!) lol

Also, do you have a THT alternative to suggest for the nearly $2/piece LTV-M601?

I'm onto Micro-Cap 12. Industrial grade simulator, currently free/no support. Rich archive (spice models, all imaginable examples, etc). 
archive.org/details/mc12cd_202110

6VDC analog is achievable with the same circuit. e.g. Drop R3 down to 2K with a 12V input == 3V analog @ 50% pwm duty cycle. 

TH plenty in the high-speed/quality optos. Pull up your fav e.component supplier and search "High Speed Optocouplers"
e.g. www.mouser.com/c/optoelectronics/optocou...-speed-optocouplers/
 

Can anyone help me, How to Spindle Orientation using forward-reverse PWM signals using parallel port? 

I have connected the encoder signal to the spindle axis. and the encoder works fine, I can run rigid tapping. But I am confused about how to configure the spindle orientation to position the BT30 lock before toolchange..

Mecanix: What sim are you using? I cant seem to find something decent AND has a full library.... It has been years since I tried LTSpice, has it gotten better?

Keep in mind (not that I expect you to know) that I am using a +-6 volt signal to run the yaskawa drives on their input 1. (I have my reasons!) lol

Also, do you have a THT alternative to suggest for the nearly $2/piece LTV-M601?

I guess I may never stop hearing about the ChatGpt thing! lol. No, ChatGpt did not make my schematics or have anything to do with them. Those are all true 100% human work! Also probably why I am still using PC827...... I may have to update them. Thanks for that. 
As for level-shifting, this board has a 23 x 74hc245t on it. I plan to pull the Vcc pins of the input chips and move them to the 3.3 V rail. They will then take a 5V input and output 3.3V. I will leave the output chips alone as they are shifting their inputs up to 5V.

Ok about 24hr later.
Linuxcnc has been idling all that time, run some gcode every now and again, screen goes blank after no input, wiggle the mouse and it wakes up, not a single packet issue.
I'd say it's pretty bloody good. World's better than before.
Thanks so much for the hard work.

Hi PCW!
I am working with Debian 12 and Linuxcnc 2.9.1

Oops, just noticed you're on a 24V input (not 12V). My bad. In that case change R3 to a 28K'ish. GPT would have spot that inaccuracy...

Sim with LTSpice or with any of those online simulatorswhatever... plenty of them around www lane. GL.

What version of LinuxCNC and OS are you using?

 I can try an duplicate this. I don't have a PCI Ethernet card
compatible test system but can test with  a USB-->Ethernet
dongle for general internet access, This should be similar
enough to at least get an idea where things are going wrong.
 

@tommylight - can you please tell me where to find that network HowTo? Couldn't find that here.
After deleting and reboot the network manager shows no wired connection anymore, no auto inet. I can send the actual ip a if my internet is working again. Actually it isn't. I'm writing from my windows PC.

@Chris@cnc - i changed the network/interfaces to your suggestion and after reboot I dont have any connection no more.

Is that allright? Do I have to reconfigure both connections as before? How do I find out which name is what card? I want to have the internal intel card for MEsa and the RTL8111 for Internet. Cables are sitting ok for that config.
So, I tried to configure a new connection for Internet with eno1 - my settings in network manager are set, but no connection is shown. ip a shows the new entry after reboot, but there's no connection shown in the upper right edge of my desktop.

Thanks in advance!

Cant do this anymore bye all wrote:

The only chips that I'm aware of are the 74LVC series that run off 3.3v but have 5v tolerant inputs. 

We use TI's LSF0108 alot. Bidirectional featured too, and so can interface In or Out at the firmware end. The TXU0104 is another I use quite often, unidirectional, however features schmitt triggers... farewell noisy and slow rises & falls!!

@OP - The PC827 is ancient (medieval crap). s l o w. I'd upgrade this to a Year 2024 era 10meg capable-like LTV-M601. Finally, the PWM-to-10V works perfectly fine. Best way to answer your own question is to simulate the circuit (LM358 here). Something ChatGPT ain't great at

I'm assembling a machine on EtherCAT. All the mechanics are ready, checked on stepper motors while the servo motors are still on the way. But the spindle is available and there was a question of connecting it. The speed can be controlled by 0-10 volts or PWM. Plus, I need to connect Estop and MPG. I'm considering the following options:

1. Since I have a computer with two network ports, I can connect RP2040 via Ethernet to one of them. Cheap and angry, but I would like to do everything on one technology.

2. Noname EtherCAT i/o board from Ali Express (but which one?)

3. Beckhoff EK1828 coupler with 4 digital inputs and 8 digital outputs.  www.beckhoff.com/en-en/products/i-o/ethe...-coupler/ek1828.html  But is it possible to issue a computer-generated PWM signal through it and receive feedback from the spindle about the speed?

I would like to do with one device that covers all needs except servos. What are your recommendations, colleagues?

So how are you going to do the 5v to 3.3 translation for the inputs ? As the FPGA isnt 5v tolerant on the inputs.

The only chips that I'm aware of are the 74LVC series that run off 3.3v but have 5v tolerant inputs. Or you can use fet bus switches but they need pullup resistors and have a vcc of no more of about ~3.9 to ~4.2v.

That's also been my biggest gripe with those boards, the amount of rework to safely get 5v inputs.

working twincat3 project with EL6751 and one slave... I am creating the .xml config and I will try them with etherlab master...

regards

Hi,

I had to review some path blend code. Step by step, we go forward.
This is a tiny example how to use path blend, tooldir blend, & 3d velocity profile together.

The begin of something good maybe... I am still working on the tooldir, this needs some code review
here and there.


I did a test on the parport production machine, to test the velocity profile. The machine
or my pc is unable to perform a nice 9 axis job. As a result of that,
i am planning to run an ethercat production machine coming day's. This machine still uses stepgen.
However, best is to send just the coordinates to a servo drive. That saves the pc a huge ammount of
calculation time over 9 scurve axis.

 

Wow this is shaping out to be quite tricky! There is probably no useful info in this message, but I found that writing stuff down sometimes reveals a sensible next step in an otherwise blurry mess of ethercat acronyms

By rearranging the PDOs in the manufacturer supplied TwinCAT 2 project slightly I can get the drive to OP state and I can even read cyclic PDO data from it, such as statusword, velocity and position. But the other direction master-> drive PDO transmission is not received no matter what I try.
 

• I have verified equal 1ms cycle time settings in the servo drive config software, in the TwinCAT 2 distributed clock settings, in the TwinCAT 2 axis and PLC
• Even if this was a distributed clock configuration or jitter issue, Metronix ARS 2310 FS claims to be able to synchronize with raw Ethercat frames on the network if no DC is available
• I am seeing 1 (one) successful master->drive PDO transmission per preop->op state transition, where I believe TwinCAT also transfers a lot of SDO settings

It's worse on LinuxCNC, here I don't even receive any PDO data from the drive. But here too the drive reaches OP state and SDO transmissions via ethercat download or ethercat upload work and are evaluated seemingly correctly by Metronix.
 

I am still not quite sure how important the SII EEPROM data is. If I use siitool -m to create an eeprom image from the manufacturer supplied EDS xml profile with PDO mappings, any ethercat sii_write attempts are seemingly dismissed, afterwards the drive is listed only with some IDs in ethercat slaves. An image created without PDO mappings, but only with sync managers and human readable manufacturer strings etc can be written successfully and is listed as such in ethercat slaves even after power cycles.
 

With the diagnostics in my Chinese servo drives I can verify that Linux-dominated Ethercat has the correct sync cycle time of 1ms configured. I've never seen any errors from them, but there does seem to be a non-zero number of SM2 lost times and Sync lost times, maybe 1 per second? Is that normal or could that be a problem for a fastidious German servo drive?
 

The laptop on which I am currently running TwinCAT and the Raspberry Pi on which I am running the Linux Ethercat master are both not equipped with especially reputable Intel NICs ... could that be a fundamental problem? Should I look for some normal office PC for a test run?