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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 6415 - [TO unit : ] Tool with tool edge no. has reached tool monitor warning limit
Alarm 6415 fires when a tool monitored via the Tool Management (TO) unit reaches its predefined time or quantity limit threshold. This is a lifecycle notification indicating the monitored tool edge has exhausted its configured tool life in MD 20110 (Tool life time) or MD 20111 (Tool life quantity), triggering an OPI interface alert without halting the NC program.
6415
Siemens 6415 - [TO unit : ] Tool with tool edge no. has reached tool monitor warning limit
Tool with tool edge no. has reached tool monitor warning 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 6415 fires when a tool monitored via the Tool Management (TO) unit reaches its predefined time or quantity limit threshold. This is a lifecycle notification indicating the monitored tool edge has exhausted its configured tool life in MD 20110 (Tool life time) or MD 20111 (Tool life quantity), triggering an OPI interface alert without halting the NC program.
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
Access Siemens HMI (MMC) and navigate to Diagnostics > Tool Management or use PLC interface to verify tool %2 edge %3 accumulated time in the tool offset memory (TO unit parameter TOOL_LIFE_TIME_USED).
- 2
Compare accumulated time against MD 20110 threshold configured in machine parameters. Check TO unit settings via NCK parameter assignment (usually via ShopMill/ShopTurn or SINUMERIK Operate panel).
Do not modify MD 20110 during program execution; queue parameter changes for next NC startup.
- 3
Replace tool edge %3 or reset tool life counter in TO unit via HMI Tool Management menu (Offset > Reset Tool Life). Confirm tool offset is correctly assigned in the part program via T-number and D-number.
- 4
Verify OPI trigger assignment in PLC program block (typically SIMATIC S7 logic monitoring TO unit output) or MMC task configuration to ensure tool change is scheduled before next tool engagement.
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