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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 10249 - [up to SW 3.x only] Mode group channel : mode change command
Alarm 10249 occurs on SINUMERIK 840D systems with software version 3.x or earlier when a mode change command is issued to a specific mode group and channel while the system is not in a valid state to accept the change. This typically happens when attempting to switch operating modes (AUTO, MDA, JOG) while the channel is active, executing a program, or when mode group synchronization conditions are not met.
10249
Siemens 10249 - [up to SW 3.x only] Mode group channel : mode change command
[up to SW 3.x only] Mode group channel: mode change command
An error occurred while a mode change command was active, with the result that the sequence could not be continued Control reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display.
Root Cause Summary
Alarm 10249 occurs on SINUMERIK 840D systems with software version 3.x or earlier when a mode change command is issued to a specific mode group and channel while the system is not in a valid state to accept the change. This typically happens when attempting to switch operating modes (AUTO, MDA, JOG) while the channel is active, executing a program, or when mode group synchronization conditions are not met.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
Check the channel status on the HMI - verify if a program is currently executing or if the channel shows ACTIVE status.
- 2
Press the RESET button to clear any active program execution and bring the channel to a stopped state.
Ensure the machine is in a safe position before issuing RESET as this will interrupt current motion.
- 3
Wait for all axes to come to a complete stop and verify channel status shows RESET or STOP state.
- 4
Retry the mode change command (switching between AUTO, MDA, or JOG modes) after confirming the channel is idle.
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