Code 201930: <location>IF1: PB/PN current controller clock cycle clock cycle synchronous not equal
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>IF1: PB/PN current controller clock cycle clock cycle synchronous not equal 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: The current controller clock cycle of all drives must be set the same for the clock cycle synchronous operation. Alarm value (r2124, interpret decimal): Number of the drive object with diffe rent current controller clock cycle. Remedy: Set current controller clock cycles to identical values (p0115[0]). Note: IF1: Interface 1 PB: PROFIBUS PN: PROFINET See also: p0115
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 201930 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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