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Code 235228: <location>TM: Sampling time p4099[3] invalid

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM: Sampling time p4099[3] invalid 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: TM41 Reaction: NONE Acknowledge: IMMEDIATELY Cause: The value of the cycle time for the incremental enc oder emulation, specified in p4099[3] does not correspond to a valid value. The system has already changed p4099[3] to a valid value. The parameters of the TM41 in question must be saved on the memory card and a POWER ON carried out. If necessary, the sampling time can be checked again the next time the system is switched on, taking into account any other TM41s located on the same DRIVE-CLiQ line. The following rules must be observed when setting p4099[3]: - if several TM41 are located on a DRIVE-CLiQ line, the same sampling time in p4099[3] must be set for all components. - the sampling time of a TM41 in SINAMICS mode (p4400) must correspond to that of the emulated encoder. The encoder sampling time is normally t he same as the parameter value p0115[0] of the drive object used to interconnect the TM41 via connector input p4420. - it is not possible to operate two TM41s on one line if they emulate encoders with different cycles. Remedy: None necessary.

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 235228 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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