Code 700749: Check limit switch: >Magazine place free (loading position)<
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Check limit switch: >Magazine place free (loading position)< 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
It was detected that the proximity switch "Tool correctly inserted" is signalling although the ultrasonic sensor "Magazine place vacant (loading position)" hasn't detected a tool at the loading position. It is not possible to move the tool magazine. The direction key indicator lights [traverse tool magazine] are flashing quickly. 1. Check whether the tool magazine is in position. The indicator lights [Traverse tool magazine] are permanently illuminated as soon as the magazine is in position. 2. Check the proximity switch "tool correctly inserted (loading position)" and the PLC input signal. 3. Check the ultrasonic sensor "magazine place vacant (loading position)" and the PLC input signal. Possible combinations: Tool removed: Magazine place free = [ 1 ] + tool correctly inserted = [ 0 ] Tool inserted: Magazine place free = [ 0 ] + tool correctly inserted = [ 1 ] 4. Once the malfunction has been remedied, the movement command for the tool magazine is enabled 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 700749 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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