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  • programador
  • programador's Avatar
14 Jan 2025 19:01

How to use the velocity encoder signal as position feedback for the 7i77 board?

Category: HAL

Thank you, it solved the problem, the screen is showing the correct display.

 

But when I try to start the machine, the message "error calculating movement on axis 1" appears. I tried to change the max_limit and min_limit values ​​in the INI file, but without success.

When this error message appears, is it possible to see in more detail which configuration is still wrong?

Do you have any tips or examples of how I should configure axis 1 so that the error does not appear?


Below are the HAL and INI files for your consideration.

 

File Attachment:

File Name: Z3_2025-01-14.hal
File Size:8 KB
 

File Attachment:

File Name: Z3_2025-01-14.ini
File Size:3 KB

 
  • PCW
  • PCW's Avatar
14 Jan 2025 18:30

Error problem hm2 7i96s 7i77 analogout scalemax not found ?

Category: HAL

You cannot run that command when LinuxCNC is running
or when it exited on a major error, because linuxCNC
blocks access to the Ethernet port it is using when it is running.

LinuxCNC restores access when it exits normally

 
  • programador
  • programador's Avatar
14 Jan 2025 18:13

Error problem hm2 7i96s 7i77 analogout scalemax not found ?

Category: HAL

Thanks for the suggestion of the command below:

mesaflash --device 7i96s --addr 10.10.10.10 --dbname3 7i77 --readhmid

It's a great option to debug any problems. But unfortunately in my case it wasn't allowed, the error below appeared:

lbp16_access.send_packet: Operation not permitted
Aborted

Do I have to assign a name or register it in the system so that readhmid works through the name? If so, do you have an example?
  • PCW
  • PCW's Avatar
14 Jan 2025 18:09

How to use the velocity encoder signal as position feedback for the 7i77 board?

Category: HAL

Try this:

# ---Encoder feedback signals/setup---

#setp hm2_7i96s.0.encoder.00.counter-mode 0 #Default PNCConf Wizard
setp hm2_7i96s.0.encoder.00.counter-mode 1 #change to accept signal from THCAD2 board as Z axis feedback
#setp hm2_7i96s.0.encoder.00.filter 1 #Default PNCConf Wizard
setp hm2_7i96s.0.encoder.00.filter 0
setp hm2_7i96s.0.encoder.00.index-invert 0
setp hm2_7i96s.0.encoder.00.index-mask 0
setp hm2_7i96s.0.encoder.00.index-mask-invert 0
setp hm2_7i96s.0.encoder.00.scale [JOINT_1]ENCODER_SCALE

net z-pos-fb <= hm2_7i96s.0.encoder.00.velocity

#net z-vel-fb <= hm2_7i96s.0.encoder.00.velocity
net z-pos-fb => joint.1.motor-pos-fb
net z-index-enable joint.1.index-enable <=> hm2_7i96s.0.encoder.00.index-enable
net z-pos-rawcounts <= hm2_7i96s.0.encoder.00.rawcounts
  • programador
  • programador's Avatar
14 Jan 2025 17:58

How to use the velocity encoder signal as position feedback for the 7i77 board?

Category: HAL

Good afternoon, dear friends.

Please, how should I make the connections in the HAL file so that the 7i77 electronic board accepts the frequency generated by the THCAD2 electronic board as feedback from the Z axis?

Below is the basic code generated by PNCConf from LinuxCNC:
# ---Encoder feedback signals/setup---

#setp hm2_7i96s.0.encoder.00.counter-mode 0 #Default PNCConf Wizard
setp hm2_7i96s.0.encoder.00.counter-mode 1 #change to accept signal from THCAD2 board as Z axis feedback
#setp hm2_7i96s.0.encoder.00.filter 1 #Default PNCConf Wizard
setp hm2_7i96s.0.encoder.00.filter 0
setp hm2_7i96s.0.encoder.00.index-invert 0
setp hm2_7i96s.0.encoder.00.index-mask 0
setp hm2_7i96s.0.encoder.00.index-mask-invert 0
setp hm2_7i96s.0.encoder.00.scale [JOINT_1]ENCODER_SCALE

net z-pos-fb <= hm2_7i96s.0.encoder.00.position

net z-vel-fb <= hm2_7i96s.0.encoder.00.velocity
net z-pos-fb => joint.1.motor-pos-fb
net z-index-enable joint.1.index-enable <=> hm2_7i96s.0.encoder.00.index-enable
net z-pos-rawcounts <= hm2_7i96s.0.encoder.00.rawcounts

Note:

The TCHAD2 electronic board receives the analog voltage from the Z-axis movement which is a magnetic sensor with repeatability accuracy of 10µm (MICRA, micron or micron), with a recordable speed of 10m/s (meters per second) and IP67 classification (dust protection and water and oil resistance).
This sensor provides 0 volts at the output when the Z axis is lowered and 8 volts at the output when the Z axis is raised. The TCHAD2 electronic board converts this voltage into a frequency of 100kHz to 1Mhz (according to the chosen jumper). Then the 7i77 electronic board receives this frequency on encoder channel 0. It displays the position results counting to infinity, with only velocity being usable as position, with the low Z axis having a low frequency and the high Z axis having a high frequency.
Please, any basic example helps or suggestions. I appreciate your collaboration. Attached is a video showing how the values ​​from the TCHAD2 electronic board are being received by LinuxCNC.

*MICRA: The symbol (µm) and correspond to the microscopic unit of measurement, where 1 micron is the same as dividing 1 millimeter by 1000


 
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