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Hello PCW,
I flashed my 7i96s with 7i96s_2pwmd.bin and put this line to my custom.hal:

# invert pwm output
setp hm2_7i96s.0.pwmgen.01.out0.invert_output true.

When I start linuxcnc i get the error message
"parameter hm2_7i96s.0.pwmgen.01.out0.invert_output not found"

The hmid-output looks correct:
TB2 2,3 25 IOPort PWM 1 PWM (Out)
TB2 4.5 26 IOPort None

Can you post a halscope plot of: 

1 Joint velocity
2. Joint following error

it's a static error. But when I put “I” > 1 I get a joint tracking error.

Put 1 resistor on each cable, much safer.
www.mouser.de/ProductDetail/Vishay-Dale/...rmWJGO8s8TXMfjOoM%3D

Thanks Ben, I tried your suggestion but the behaviour is the same. Works in Velocity mode but not in Step mode.
I spent the morning looking at signals with halmeter but I cannot figure this out.

Thanks for taking your time to look into this.

Never mind, I found the issue. It was my fault I mis-wired one of the pins on the bob.Great learning experience with the LinuxCNC software digging through the particulars! You guys pointed me in the right direction, much appreciated!

Hi PCW:

Thanks for your reply.
When you mentioned: "So if you don't have dual homing switches you need to setup immediate homing"...can you tell me more about that please?

Thanks for your help and support! I set up my parallel port in the step config just as your image above. I have my motors and bob set up on my desk as a test set up to work out the set up without injury to my machine. In a real world application Id need to be able to jog my Y axis (both motors driven at same time) tgether at once. Would I need to set up something in one of the hal or ini files?

Thanks again for your help.

Thanks.

So I could open the Plasma source, cut the cable behind the THC-plug and solder 2 x 1MegaOhm in series of the negative cable and put a shrink tubing over the 2 resistors ?

Is there an alternative to the 1MegaOhm-resistor ? I ask because in the mesanet-store it shows me over 200$ shipping-cost for the 3 resistors and there is an error when the website calculates shipping costs to germany.

If I interpret this correctly then it was added in 2.9pre:
github.com/LinuxCNC/linuxcnc/commit/3d00...37be66c946acc972636e

Ahh... that's where the Forum poster

(forum.linuxcnc.org/24-hal-components/566...6eu-hal-and-ini-file) 

got 2.9 pre

The HM2_eth driver from that version also has bugs with 7I76EU configs
(it gets the name wrong)
 

My guess is this was added sometime after 2.9.pre but the docs are quite confusing stating 2.9.y which means nothing to me.

JT

I tried 2.9.pre (the one that you get from Debian) and 2.9.1 from a deb I downloaded and adding them to an Axis ini file and they do not limit anything. I put MAX_FORWARD_VELOCITY = 100 and can do a m3s50000 and it sets the spindle speed to 50000

JT

Hallo
Anscheinent sind alle auf Urlaub.
 

You can look at the manual, but this was definitely  the case at one time.

Edit: the ENA input is actually an active low disable input, that is, it disables
the drive when pulled low. If unconnected, the drive should be enabled.
Is the interface PIN 16 (+24V IN) connected to +24V?

A quick way to check if the drives are enabled is to see if the motor
shaft turns freely. It should hold position if enabled but turn freely if disabled.


Not related to your lack of motion, but to safety:

Its fairly awkward that ENA needs to be powered to disable the drive, but a possible
working arrangement would be to add a pull down resistor on the ENA input so its
normally disabled and then drive it high with a 7I76EU output to enable it
(A 1K 1/2W resistor should work)

Not sure what makes you say they 'don't do anything'.

Adding this to the axis sim in a current build of 2.9:

seems to have the described effect: