Code 201900: <location>PROFIBUS: Configuration telegram error
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>PROFIBUS: Configuration telegram 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: All objects Reaction: NONE Acknowledge: NONE Cause: A PROFIBUS master attempts to establish a c onnection using an incorrect configuring telegram. Alarm value (r2124, interpret decimal): 50: Syntax error. 51: Connection established to more drive objects than configured in the device. The drive objects for process data exchange and their sequence were defined using p0978. 52: Too many data words for input or output to a drive object. A maximum of 16 words is permitted for SERVO and VECTOR; and a maximum of 5 words for A_INFEED, TB30, TM31 and CU320. 53: Uneven number of bytes for input or output. Remedy: Check the bus configuring on the master and slave sides. Re alarm value = 51: Check the list of the drive objec ts with process data exchange ( p0978). With p0978[x] = 0, all of the following drive objects in the list ar e excluded from the process data exchange.
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 201900 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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