7i97t Mesaflash Problem

Yes, in the hal file, the analog outputs are all controlled by PWM values.

The actual PWM value shoudl be set by the output of a PID component that
in turn reacts to the difference in the encoder position to LinuxCNCs
commanded position.

Yes, the value comes from the PID. My power amplifier is a -10/+10V. Is the value a voltage value? If the value is, for example, 17, I measure at the Mesa only 0.35V.

The output voltage should be PWMvalue/PWMscale

I'm talking about the PWM value. So this value is a voltage value? Like 17V? I know how to limit this value. But I never measure this value on the Mesa. It's always only 0.35V as soon as I enable it.

The output voltage should be PWMvalue/PWMscale

So if PWMscale is 10 the output voltage=PWMvalue

But no matter what the value is set to or how I change the scale, the Mesa only ever outputs ~0.35V. Or are there jumpers or something similar on the Mesa hardware that I need to adjust?

Thank you so much for your help! I really appreciate it.

Hard to tell whats going on could be you have the wrong output
or there's a hal or hardware issue. To determine whats going on,
can you run LinuxCNC, enable motion, and then in a terminal window run:

halcmd show all | grep pwm > pwm,.txt
 
and then post pwm.txt here





 

Happy New Year!

36 bit IN TRUE hm2_7i97.0.pwmgen.00.enable <== x-enable
36 float IN -2.5 hm2_7i97.0.pwmgen.00.value <== x-output
36 s32 RW 1 hm2_7i97.0.pwmgen.00.output-type
36 float RW 10 hm2_7i97.0.pwmgen.00.scale

With these settings you would expect about -2.5V output of analog out 0

Possible reasons to not get about -2.5V

Looking at the wrong pins

output overloaded

5V 7I97T supply low

Damaged 7I97T

When I move the axis further using the LinuxCNC interface, the value keeps increasing, as if it were the value of the distance traveled... for example, -77... Is that supposed to happen? I'm also only getting 0.35V at the other PWM outputs, both with and without the power amplifier connected.