Code 701543: Safety device loader not closed
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Safety device loader not closed 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
The function "With loader" was activated, the machine is ready for loader mode, but the loader guard is not closed. PLC input signal "Loader guard closed“ is not present. The drives on the machine are switched off. It is impossible to operate the machine. 1. Check the guard of the loader and close it. 2. Check PLC input signal "Loader guard closed". 3. As soon as the malfunction has been remedied, press [FEED START] or [CYCLE START]: Message is cleared and the drives are activated again.
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 701543 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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