What causes Siemens SINUMERIK alarm 2900?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 2900?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 2900 detailed remedy.

axismd.ai

Siemens SINUMERIK Controller

System · Intermediate · 30-120 minutes

Alarm 2900

Siemens 840D 2900 - Reboot is delayed

Alarm 2900 is a non-critical informational alarm that fires when the MMC (Man Machine Control Panel) initiates a system reboot via the PI (Programmable Interface) service '_N_IBN_SS' and MD 11410 $MN_REBOOT_DELAY_TIME is configured with a value greater than zero, causing the reboot sequence to be intentionally delayed. This alarm indicates the system is waiting during the configured delay period before executing the actual reboot.

Siemens SINUMERIKSystemIntermediate30-120 minutes

2900

Siemens 840D 2900 - Reboot is delayed

Reboot is delayed

Root Cause Summary

Alarm 2900 is a non-critical informational alarm that fires when the MMC (Man Machine Control Panel) initiates a system reboot via the PI (Programmable Interface) service '_N_IBN_SS' and MD 11410 $MN_REBOOT_DELAY_TIME is configured with a value greater than zero, causing the reboot sequence to be intentionally delayed. This alarm indicates the system is waiting during the configured delay period before executing the actual reboot.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Siemens HMI or engineering environment (SINUMERIK Operate or StartDrive) and navigate to Machine Data (MD) editor in NCK menu
2
Locate MD 11410 $MN_REBOOT_DELAY_TIME and verify the current value in milliseconds
3
If delay is not required for your process, set MD 11410 $MN_REBOOT_DELAY_TIME to 0 to eliminate alarm 2900 on future reboots
Setting to 0 removes safety delay for graceful PLC/NCK shutdown coordination; verify this is acceptable with your automation design
4
Save MD changes and trigger a system reboot via MMC/PI '_N_IBN_SS' command to confirm alarm 2900 no longer appears

Service Recommended confidence

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.