Code 235015: <location>TM54F: Communication with drive not established
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM54F: Communication with drive not established 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: NONE Cause: Cyclic communication of one or several drives with the Terminal Module 54F (TM54F) is not active. Fault value (r0949, interpret binary): Bit 0 = 1: No communication with drive 1.... Bit 5 = 1: No communication with drive 6. For fault value = 0, the following applies: The number of drive objects specified in p10010 is not equal to the number of drives that have drivebased motion monitoring functions that have been enabled. The drive object number for drive n is set in p10010[n-1]. When this fault is present, none of the drives that have drive-based motion monitoring functions operating with TM54F, are enabled. Remedy: For all drive objects specified in p10010, check w hether the drive-based motion monitoring functions with TM54F are enabled (p9601).
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 235015 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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