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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 75090 - Axis stopped by external process monitoring system
Alarm 75090 is triggered when an external process monitoring system (typically a tool breakage detection module or adaptive control interface) signals the NCK to halt axis motion due to detected or predicted tool failure. This is a protective interlock that prevents damage from continued machining with a compromised tool.
75090
Siemens 75090 - Axis stopped by external process monitoring system
Axis stopped by external process monitoring system
An external process monitoring system has stopped the axis, as tool breakage is to be expected or has already occured Control reaction: The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm.
Root Cause Summary
Alarm 75090 is triggered when an external process monitoring system (typically a tool breakage detection module or adaptive control interface) signals the NCK to halt axis motion due to detected or predicted tool failure. This is a protective interlock that prevents damage from continued machining with a compromised tool.
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 PLC program logic in the process monitoring cyclical interrupt (OB35 or equivalent) for the tool breakage detection routine. Verify signal flow to axis stop command (typically via DBRead/DBWrite to NCK interface DB).
- 2
Inspect actual tool condition and measure runout/wear using diagnostic calipers. Compare against tool offset parameters (MD20050, MD20051 for tool length/radius compensation) to confirm if tool is actually damaged.
Do NOT resume axis motion until tool condition is verified.
- 3
Review cutting force/vibration sensor readings in the process monitoring system logfile. Check parameter MD32910 (axis-specific servo alarm reaction time) to ensure detection threshold is appropriate for the application.
- 4
Replace tool if damaged, reset monitoring system counters, and clear alarm via MDI mode (RESET key) or programmatically via G-code M0/M1 sequence after tool change.
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