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www.suse.com/security/cve/CVE-2023-52993.html says this is a Linux kernel vunerability. Might the latest version of linuxCNC fix this?

GRUB_CMDLINE_LINUXCNC_DEFAULT="lapic quiet rootdelay=5"

I do not see "nosplash" anywhere in /etc/default/grub.

Also this has worked perfectly on this hardware for years until yesterday,

I think you are measuring the enable pins (1,2) rather than the analog outputs
(3,4)

I use stepper online dm542t and dm556 have over 50 of them in operation on machines running at least 8 hours a day and have never had any issues with them. I have never measured the current to see if they are getting 3 amps but I will say they are stronger than any of the tb6600 boards I've seen.

Hi Tommy,

Thanks for your answer. 

I have disconnected all drives and measured directly on the pins. (Indicated with the red dots on the image)

It doesn't matter what I set hm2_7i94.0.7i77.0.1.analogout0 to, the value stays 0V, or about 0.3V when hm2_7i94.0.7i77.0.1.analogena is enabled.

 

I'm glad you guys know what you're talking about, most days I'm happy if I tie my shoelaces correctly 

Any hoo, I was wondering about shift registers, in that should I use hardware means to clear all outputs? I haven't had a lot to do with them but I understand that the output shift registers can have undefined states at startup and possibly turn on randomly. For the most part probably not an issue but if you are using them for things that shouldn't turn on at startup, tool release, turret clamp, Z Axis brake, spindle gearbox and so on. My friend (Babinda01 on here) has mentioned using a simple resistor/cap combination connected to the shift register clear pin to reset the output registers at power up, which sounds like a good idea instead of burning up a pin from the FPGA.

Also just checking that I can assign ModBus pins for output for a second FPGA and also additional ModBus pins for, well normal Modbus things? My understanding is the ModBus to the second FPGA is just for doing that, and not for adding traditional ModBus devices, so I should design a second "standard" Modbus connection.

Cheers.
Russell.

Looks like if you buy a Tb 6600 you really don’t know what you get.
I had bought another Tb 6600 and tested it.
Stepper motor much noisier with that new one with the same micro stepping. Outside they look the same but the new ones plastic cover. Last week I cut a large sine and one of the steppers stopped moving so. Lots of material waisted.

So I did run the program again with the torch off same happens at the same place. So I added two 80 mm fans to cool the drivers
Now I can run the programs three times in a row and everything runs fine. So tomorrow I will try to cut the sign. I run them on 2.5 amps . The one for the Z axis runs on 1.5 amps. So I can affirm they are probably reliable for up to 1.5 amps so I am looking for a replacement.

I am considering a Chinese Dm556 or a TMC 2160 How much can they handle in reality?

Does anyone on this Forum use them can they handle 3Amps in reality?