Code 700028: PLC-MD wrong (4/5 axis)
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical PLC-MD wrong (4/5 axis) 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
An inconsistency has been found between the 4th/5th axis clamping (pressure switch) and the settings (PLC – machine data). The error has the following effect: Feed Stop No axis movements possible. Read disable Control reads no further program blocks into memory. Adapt PLC – machine data "Monitoring pressure switch clamping 4th/5th axis" to the corresponding axes. (see machine parameter for 4th/5th/6th/7th axis (clamping)) As soon as a function is deactivated via the PLC machine parameter, no input may be registered for this function either. Error messages Axes (>Z) PLC-MD wrong (4/5 axis)
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 700028 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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