Code 231860: <location>Encoder 1 DRIVE-CLiQ (CU): Telegram error
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Encoder 1 DRIVE-CLiQ (CU): 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: Component number: %1, fault cause: %2 Drive object: All objects Reaction: A_INFEED: NONE (OFF1, OFF2) SERVO: ENCODER (IASC/DCBRAKE, NONE) VECTOR: ENCODER (IASC/DCBRAKE, NONE) Acknowledge: IMMEDIATELY Cause: A DRIVE-CLiQ communication error has occurred from t he Sensor Module (encoder 1) involved to the Control Unit. Fault value (r0949, interpret hexadecimal): yyxx hex: yy = component number, xx = fault cause xx = 11 hex 17 dec: CRC error and the receive telegram is too early. xx = 01 hex = 01 dec: Checksum error (CRC error). xx = 12 hex = 18 dec: The telegram is shorter than that specified in the l ength byte or in the receive list and the receive telegram is too early. xx = 02 hex = 02 dec: Telegram is shorter than specified in t he length byte or in the receive list. xx = 13 hex = 19 dec: The telegram is longer than that specified in the lengt h byte or in the receive list and the receive telegram is too early. xx = 03 hex = 03 dec: Telegram is longer than specified in t he length byte or in the receive list. xx = 14 hex = 20 dec: The length of the receive telegram does not match the receive list and the receive telegram is too early. SINAMICS-Alarms xx = 04 hex = 04 dec: The length of the receive telegram does not match the receive list. xx = 15 hex = 21 dec: The type of the receive telegram does not match the re ceive list and the receive telegram is too early. xx = 05 hex = 05 dec: The type of the receive telegram does not match the receive list. xx = 16 hex = 22 dec: The address of the power unit in the telegram and in the receive list does not match and the receive telegram is too early. xx = 06 hex = 06 dec: The address of the power unit in the telegram and in the receive list do not match. xx = 19 hex = 25 dec: The error bit in the receive telegram is set and the receive telegram is too early. xx = 09 hex = 09 dec: The error bit in the receive telegram is set. xx = 10 hex = 16 dec: The receive telegram is too early. Remedy: - carry out a POWER ON. - check the electrical cabinet design and cable routing for EMC compliance - check the DRIVE-CLiQ wiring (i nterrupted cable, contacts,...). See also: p9915 (DRIVE-CLiQ data transfer error shutdown threshold master)
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 231860 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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