Sinumerik 840D sl: How to set absolute reference position of any axis (MD34100[0] and MD34210[1])

[@BBdeLorean]

I have a problem with the Y axis, it asks me to bring it to the reference point. The machine in question is a DMC 635V ECO Siemens 840d

[@elgunsn5544]

Hi friend, I changed my absolute encoder and its type is Heidenhain Previous encoder and current encoder between difference is previous: M6 and current M8 , and serial numbers differences but in sinumerik 840d sl controller i can see new encoder serial number. So I have one error (25050 axis contour monitoring); in error says control mechanic parts and encoder parameters , my mechanic parts are good, and I have no another encoder my encoder is working but I think parameters is not suitable. Please help me, what should I do? My motor rotate little bit and occur this error. Thank you 😊

[@FabianAchaval]

@@elgunsn5544 Alarm 25050 on the SINUMERIK 840D sl is a **contour monitoring alarm**. This alarm is triggered when the difference between the calculated axis position (based on the setpoint value) and the actual axis position exceeds the tolerance value set in axis parameter MD 36400 Here are some steps to troubleshoot this alarm **Look for any mechanical issues** such as coupling, gear backlash, or lubrication problems **Check the spindle position encoder feedback** and ensure it is functioning correctly **Verify the spindle positioning** and ensure it reaches the target position during tool changes **Inspect the spindle related parameters** and encoder cables **Check the MD 36400 parameter** to ensure the contour tolerance is set correctly Does this help clarify things for you?

[@elgunsn5544]

@FabianAchaval thank you brother. But I check all of this everything is ok, and the parameters are same with another machine only I have one difference haidedain encoder M6 previous M8 now M6 - M8 are code on encoder. Do you know is it cause for this problem, I searched but I didn't find any information about it

[@elgunsn5544]

@@FabianAchaval .

[@ManishFaujdar-ht3xs]

Sir please help axis b waiting for drive alarm Siemens

[@FabianAchaval]

@@ManishFaujdar-ht3xs can you please be more specific or upload a video showing me your case?

[@TheViviMeireles]

Thank you

[@FabianAchaval]

@@TheViviMeireles you’re welcome

[@belmouzounamohamed671]

​@@FabianAchavalhi brother plz can i have your N whatssapp or email . Im leader team maintenance in morroco

[@PremtonThaqi]

Hi While i was configuring network on 840D SL control for program back ups. I some how messed it up and won't be able to boot it now. On machine startup i am getting the following error displayed on TCU. “startstop.sh: line 25: /siemens/common/tcu/nonfree/startvnc: not found”

[@FabianAchaval]

@@PremtonThaqi The error message **"startstop.sh: line 25: /siemens/common/tcu/nonfree/startvnc: not found"** on the Sinumerik 840D SL typically indicates that the system is unable to find the `startvnc` script, which is necessary for starting the VNC server. This issue often arises during network configuration or after changes to the system's IP settings Here are a few steps you can try to resolve this issue: 1. **Check the File Path**: Ensure that the `startvnc` script exists in the specified directory. If it doesn't, you may need to restore it from a backup or reinstall the necessary software package. 2. **Network Configuration**: If the error occurred after changing network settings, try reverting to the original settings. You might need to use a USB bootable disk to reset the IP address to its previous state 3. **Consult Documentation**: Refer to the Sinumerik 840D SL manual or Siemens support documentation for specific instructions related to this error. Is there a specific change you made before encountering this error? That might help narrow down the solution. Here you are with some useful resources: (1) Configuring company network with 840d sl - Siemens. support.industry.siemens.com/forum/WW/en/posts/configuring-company-network-with-840d-sl-can-t-restart-machine/198352. (2) Boot error on startup, 840D SL control - 313182 - Industry Support Siemens. support.industry.siemens.com/forum/WW/en/posts/boot-error-on-startup-840d-sl-control/313182. (3) NO connection with PLC/NC - 840D sl - 186140 - Siemens. support.industry.siemens.com/forum/ww/en/posts/no-connection-with-plc-nc-840d-sl/186140. (4) SINUMERIK 840D: machine does not start and getting error ... - Siemens. support.industry.siemens.com/forum/ww/en/posts/sinumerik-840d-machine-does-not-start-and-getting-error-message/264679.

[@PremtonThaqi]

@@FabianAchaval Thank You . And I need to know why it comes : Over time when reading Upon reading access /NC/_N_NC_TEA_ACX/$MNS_SPIND_POWER_RANGE[1] a time exceeding occurred. The cause may be a bottleneck of communication resources To repeat the read access, press the softkey 'Repeat'. To continue the process with access error 'time exceeding', press it Softkey 'Continue' To potentially eliminate the potential congestion of communication resources, it must HMI is restarted, press the softkey 'HMI Restart'.