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Code 201796: <location>SI Motion CU: Wait for communication

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI Motion CU: Wait for communication 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: SERVO, VECTOR Reaction: NONE Acknowledge: NONE Cause: The drive waits for communication to be established wi th SINUMERIK or TM54F to execute the safetyrelevant motion monitoring functions. Note: In this state, the pulses are safely suppressed. Remedy: After a longer period of time, if the message is not automatically withdrawn, the following checks should be made dependent on the communication: For communication with SINUMERIK, the following applies: - check additional messages that are present regarding PROFIBUS communication and resolve. - check the correct assignment of the axes on the hi gher-level control to the drives in the drive unit. - check the enable signal of the safety-relevant mo tion monitoring functions fo r the corresponding axis on the higher-level control - and if required, set For communication with TM54F, the following applies: - check additional messages that are present regarding DRIVE-CLiQ communication with TM54F and resolve. - check the setting of p10010. All of the drive obj ects controlled by the TM54F must be listed. See also: p9601 (SI enable, functions integrated in the drive (Control Unit)), p9801 (SI enable, functions integrated in the drive (Motor Mo dule)), p10010 (SI drive object assignment)

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 201796 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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