700028 — Alarm 700028 (Tool unclamped) Diagnostic Tree

This alarm code (700028) is not found in the uploaded standard Siemens source manuals. The 70xxxx series alarms in the NC/PLC interface are typically machine builder (OEM) specific PLC alarms (the 'Tool unclamped' message usually indicates that the tool clamping mechanism in the spindle or turret failed to lock the tool). Please check the tool clamping sensors/switches and pneumatic/hydraulic pressure, and consult the machine manufacturer's documentation if the issue persists.