Code 235016: <location>TM54F: Net data communication with drive not established
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM54F: Net data 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: Drive object: A_INF, B_INF, S_INF, SERVO, TM41, TM54F_MA, TM54F_SL, VECTOR Reaction: NONE Acknowledge: NONE Cause: The cyclic net data communication within the Term inal Module 54F (TM54F) is still not active. This message is output after the TM54F master and TM54F slave have booted and is automatically withdrawn as soon as communi cations have been established. If a drive does not communicate with the TM54F, then none of the drives parameterized in p10010 are enabled. Remedy: When replacing a Motor Module, carry out the following steps: - start the copy function for the node id entifier on the TM54F (p9700 = 1D hex). - acknowledge the hardware CRC on the TM54F (p9701 = EC hex). - save all parameters (p0977 = 1). - carry out a POWER ON (power off/on) for all components. The following always applies: - for all drive objects specified in p10010, check whether the drive-based motion monitoring functions with TM54F are enabled (p9601). - check whether fault F35150 is present and if required, remove the cause of the fault. See also: r10055 (SI TM54F communi cation status drive-specific)
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 235016 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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