Code 201800: <location>DRIVE-CLiQ: Hardware/configuration error
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>DRIVE-CLiQ: Hardware/configuration 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: %1 Drive object: All objects Reaction: A_INFEED: NONE (OFF1, OFF2) SERVO: NONE (ENCODER, IASC/DCBRAKE, OFF1, OFF2, OFF3, STOP1, STOP2) VECTOR: NONE (ENCODER, IASC/DCBRAKE, OFF1, OFF2, OFF3, STOP1, STOP2) Acknowledge: IMMEDIATELY (POWER ON) Cause: A DRIVE-CLiQ connection fault has occurred. Fault value (r0949, interpret decimal): 100... 107: Communication via DRIVE-CLiQ sockets X100... X107 has not switched to cyclic mode. The cause may be an incorrect structure or a configurat ion that results in an impossible bus timing. 10: Loss of the DRIVE-CLiQ connection. The cause may be, for example, that the DRIVE-CLiQ cable was withdrawn from the Control Unit or as a result of a short-circuit for motors with DRIVE-CLiQ. This fault can only be acknowledged in cyclic communication. 11: Repeated faults when detecting the connection. This fault can only be ack nowledged in cyclic communication. 12: A connection was detected but the node ID exchange me chanism does not function. The reason is probably that the component is defective. This f ault can only be acknowledged in cyclic communication. Remedy: Re fault value = 100... 107: - ensure that the DRIVE-CLiQ components have the same firmware releases. - avoid longer topologies for short current controller clock cycles. Re fault value = 10: - check the DRIVE-CLiQ cables at the Control Unit. - remove any short-circuit fo r motors with DRIVE-CLiQ. - carry out a POWER ON. Re fault value = 11: - check the electrical cabinet design and cable routing for EMC compliance Re fault value = 12: - replace the component involved.
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 201800 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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