Code 701635: Tool gripper not open
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Tool gripper not open alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Tool gripper on the tool loader is not open. PLC input signal "Tool gripper open" is not present. Tool loader functions are stopped. If the sensor signals OK again within a monitoring time of about 12 seconds, the machine continues to run. After the monitoring time has elapsed, the error must be acknowledged. 1. Check the sensor and the PLC input signal "Tool gripper open". 2. Check actuation and the valve "Open tool gripper". 3. Switch to manual mode. 4. Press [TOOL CH HOME POS.] key. Tool gripper moves to home position. 5. As soon as the malfunction is remedied, press one of the following keys: [FEED START] [CYCLE START] Message is cleared. The diagnostic overview of the sensor signals can be found under: Chapter 2.2 ‘Tool changer diagnostics menu’ on page 11
Source: CHIRON Error Message Overview, all series (Siemens control, V2.0.6, 2012)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Chiron Siemens-Control CNC Alarms
Chiron controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 701635 on the Siemens-Control CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Chiron's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 545 Chiron Siemens-Control CNC codes.
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