Code 201653: <location>SI CU: PROFIBUS configuration error
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI CU: PROFIBUS configuration error 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: %1 Drive object: SERVO, VECTOR Reaction: NONE (OFF1, OFF2, OFF3) Acknowledge: IMMEDIATELY (POWER ON) Cause: There is a PROFIBUS configurati on error for using Safety Integrat ed monitoring functions with a higher-level control (SINUMERIK or F-PLC). Note: For safety functions that have been enabled, this f ault results in a STOP A that cannot be acknowledged. Fault value (r0949, interpret decimal): 200: A safety slot for receive data from the control has not been configured. 210, 220: The configured safety slot for the receive data from the control has an unknown format. 230: The configured safety slot for the receive data from the F-PLC has the incorrect length. 240: The configured safety slot for the receive data from the SINUMERIK has the incorrect length. 250: A PROFIsafe slot is configured in the higher-l evel F control, however PROFIsafe is not enabled in the drive. 300: A safety slot for the send data to the control has not been configured. 310, 320: The configured safety slot for the send data to the control has an unknown format. 330: The configured safety slot for the send data to the F-PLC has the incorrect length. 340: The configured safety slot for the send da ta to the SINUMERIK has the incorrect length. Remedy: Re fault value = 250: - remove the PROFIsafe configuring in the higher-l evel F control or enable PROFIsafe in the drive. The following generally applies: - check the PROFIBUS configuration of the safety slot on the master side and, if necessary, correct. - upgrade the Control Unit software. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009
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 201653 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 201653.
Need a searchable reference for more Siemens SINUMERIK 840D CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026