Code 235040: <location>TM54F: 24 V undervoltage
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM54F: 24 V undervoltage 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
Message value: Fault cause: %1 bin Drive object: A_INF, B_INF, S_INF, SERVO, TM41, TM54F_MA, TM54F_SL, VECTOR Reaction: NONE Acknowledge: IMMEDIATELY Cause: For the 24 V power supply for the Terminal Module 54F (TM54F) an undervoltage condition was detected. As fault response fail-safe input terminal signals are transferred to the motion monitoring functions. Fault value (r0949, interpret binary): Bit 0 = 1: Power supply undervoltage at connection X524. Bit 1 = 1: Power supply undervoltage at connection X514. Remedy: - check the 24 V DC power supply for the TM54F. - carry out safe acknowledgement (p10006). SINAMICS-Alarms
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 235040 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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