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Code 231820: <location>Encoder 1 DRIVE-CLiQ: Telegram error

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Encoder 1 DRIVE-CLiQ: 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: OFF2 SERVO: ENCODER (IASC/DCBRAKE, NONE) VECTOR: ENCODER (IASC/DCBRAKE, NONE) Acknowledge: IMMEDIATELY Cause: A DRIVE-CLiQ communication error has occurred from the Control Unit to the encoder involved. Fault value (r0949, interpret hexadecimal): yyxx hex: yy = component number, xx = fault cause xx = 01 hex: CRC error. xx = 02 hex: Telegram is shorter than specified in t he length byte or in the receive list. xx = 03 hex: Telegram is longer than specified in t he length byte or in the receive list. xx = 04 hex: The length of the receive telegram does not match the receive list. xx = 05 hex: The type of the receive telegram does not match the receive list. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 xx = 06 hex: The address of the component in the telegram and in the receive list do not match. xx = 07 hex: A SYNC telegram is expected - but the receive telegram is not a SYNC telegram. xx = 08 hex: No SYNC telegram is expected - but the receive telegram is one. xx = 09 hex: The error bit in the receive telegram is set. xx = 10 hex: The receive telegram is too early. See also: p0491 (Motor encoder fault response ENCODER) 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: p9916 (DRIVE-CLiQ data transfer error shutdown threshold slave)

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 231820 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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