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Code 201340: <location>Topology: Too many components on one line

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Topology: Too many components on one line 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 or connection number: %1, fault cause: %2 Drive object: All objects Reaction: NONE Acknowledge: IMMEDIATELY Cause: For the selected communications clock cycle, t oo many DRIVE-CLiQ components are connected to one line of the Control Unit. Fault value (r0949, interpret hexadecimal): xyy hex: x = fault cause, yy = com ponent number or connection number. 1yy: The communications clock cycle of the DRIVE-CLiQ connection on the CU is not sufficient for all read transfers. 2yy: The communications clock c ycle of the DRIVE-CLiQ connection on th e CU is not sufficient for all write transfers. 3yy: Cyclic communication is fully utilized. 4yy: The DRIVE-CLiQ cycle starts bef ore the earliest end of the applicat ion. An additional dead time must be added to the control. Sign-of-life errors can be expected. 5yy: Internal buffer overflow for net data of a DRIVE-CLiQ connection. 6yy: Internal buffer overflow for rece ive data of a DRIVE-CLiQ connection. 7yy: Internal buffer overflow for s end data of a DRIVE-CLiQ connection. Remedy: Check the DRIVE-CLiQ connection: Reduce the number of components on the DRIVE-CLiQ line involved and distribute these to other DRIVE-CLiQ connections of the Control Unit. This means that communication is uniformly distributed over several communication lines. Re fault value = 1yy - 4yy in addition: - increase the sampling times (p0112, p0115).

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 201340 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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