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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 6417 - [TO unit : ] Tool with tool edge no. has reached tool monitoring limit
Alarm 6417 is triggered when a tool's monitoring limit (time-based or quantity-based) has been reached in the Tool Management (TO) unit. This is a non-fatal informational alarm indicating tool wear or usage threshold has been exceeded, requiring tool replacement or offset adjustment per machine setup parameters.
6417
Siemens 6417 - [TO unit : ] Tool with tool edge no. has reached tool monitoring limit
Tool with tool edge no. has reached tool monitoring limit
This message informs that at least one cutting edge of the time or quantity monitored tool has reached its monitoring limit. The alarm was triggered through the OPI interface (MMC, PLC). The channel context is not defined. The TO unit was specified for this reason Control reaction: Interface signals are set. Alarm display.
Root Cause Summary
Alarm 6417 is triggered when a tool's monitoring limit (time-based or quantity-based) has been reached in the Tool Management (TO) unit. This is a non-fatal informational alarm indicating tool wear or usage threshold has been exceeded, requiring tool replacement or offset adjustment per machine setup parameters.
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
Navigate to Diagnostics > Tool Management > Tool Database (or via HMI: Machine > Tools). Identify tool %2 and verify the configured time limit in the 'Monitoring Time' field.
- 2
Check MD 20180 (tool monitoring time limit in minutes) and MD 20181 (monitoring quantity limit) in NCK Parameter list. Confirm values match your process requirements.
- 3
Review tool usage log via OPI/MMC diagnostics to confirm accumulated spindle time. Reset tool counter via Tool Management interface or adjust SD parameters if limits are incorrectly configured.
- 4
Replace physical tool or update tool offset in tool table (MD 20090/20091 geometry offsets). Clear alarm by acknowledging via MMC or PLC interface reset command.
Do not continue machining with worn tool; verify replacement tool is loaded in turret position matching TO unit assignment.
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