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Code 201902: <location>IF1: PB/PN clock cycle synchronous operation parameterization not permissible

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>IF1: PB/PN clock cycle synchronous operation parameterization not permissible 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: Alarm value (r2124, interpret decimal): 0: Bus cycle time Tdp < 0.5 ms. 1: Bus cycle time Tdp > 32 ms. 2: Bus cycle time Tdp is not an integer mult iple of the current controller clock cycle. 3: Instant of the actual value sensi ng Ti > Bus cycle time Tdp or Ti = 0. 4: Instant of the actual value sensing Ti is not an integer multiple of the current controller clock cycle. 5: Instant of the setpoint acceptance To >= Bus cycle time Tdp or To = 0. 6: Instant of the setpoint acceptance To is not an in teger multiple of the current controller clock cycle. 7: Master application cycle time Tmapc is not an in teger multiple of the speed controller clock cycle. 8: Bus reserve bus cycle time Tdp - data exchange time Tdx less than two current controller clock cycles. 9: Bus cycle time Tdp has been modi fied with respect to the first time that the connection was established. 10: Instant of the setpoint acceptance not To <= data exchange time Tdx + To_min. 11: Master application cycle time Tmapc > 14 or Tmapc = 0. 12: PLL tolerance window Tpll_w > Tpll_w_max. 13: Bus cycle time Tdp is not a mult iple of all basic clock cycles p0110[x]. 14: For COMM BOARD with the setting To - 1 = Tdp - Ti, the instant of the setpoint acceptance is not To <= Data exchange time Tdx + 2 * To_min. 15: This configuration is not permitted for Tdp < 1 ms. 16: Instant of the actual value sensing Ti is less than the permi tted value (COMM BOARD: Ti >= 2). 17: The setting (To + Ti = Tdp + 2) is not permitted for COMM BOARD. Remedy: - adapt the parameterizing telegram. - adapt the current and speed controller clock cycle. Re alarm value = 9: - carry out a POWER ON. Re alarm value = 15: - check the number of specific drive object types in the configuration. Note: IF1: Interface 1 PB: PROFIBUS PN: PROFINET

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 201902 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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