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Code 201223: <location>CU: Sampling time inconsistent

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>CU: Sampling time inconsistent 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: NONE Acknowledge: NONE Cause: When changing a sampling time (p0115[0], p0799 or p4099), inconsistency be tween the clock cycles has been identified. Alarm value (r2124, interpret decimal): 1: Value, low minimum value. 2: Value, high maximum value. 3: Value not a multiple of 1.25 µs. 4: Value does not match clock-cyc le synchronous PROFIBUS operation. 5: Value not a multiple of 125 µs. 6: Value not a multiple of 250 µs. 7: Value not a multiple of 375 µs. 8: Value not a multiple of 400 µs. 10: Special restriction of the drive object violated. 20: For a SERVO with a 62.5 µs sampling time, more than a maximum of two SERVO-type drive objects were detected on the DRIVE-CLiQ line ( no other drive object is permitted on this line). 21: Value can be a multiple of the current controller sampling time of a servo or vector drive in the system (e.g. for TB30, the values of all of the indices should be taken into account). 30: Value less than 31.25 µs. 31: Value less than 62.5 µs. 32: Value less than 125 µs. 40: Nodes have been identified on the DRIVE-CLiQ line whose highest common denominator of the sampling times is less than 125 µs. Further, none of the nodes has a sampling time of less than 125 µs. 41: A chassis unit was identified on the DRIVE-CLiQ line as a node. Further, the highest common denominator of the sampling times of all of t he nodes connected to the line is less than 250 µs. 42: An Active Line Module was identified on the DRI VE-CLiQ line as a node. Further, the highest common denominator of the sampling times of all of t he nodes connected to the line is less than 125 µs. 43: A Voltage Sensing Module (VSM) was identified on the DRIVE-CLiQ line as a node. Further, the highest common denominator of the sampling times of all of the nodes connected to the line is not equal to the current controller sampling time of the drive object of the VSM. 44: The highest common denominator of the sampling times of all of the components connected to the DRIVE-CLiQ line is not the same for all components of this drive object (e.g. there are components on different DRIVE-CLiQ lines on which differ ent highest common denominators are generated). 52: Nodes have been identified on the DRIVE-CLiQ line whose highest common denominator of the sampling times is le ss than 31.25 µs. 54: Nodes have been identified on the DRIVE-CLiQ line whose highest common denominator of the sampling times is le ss than 62.5 µs. 56: Nodes have been identified on the DRIVE-CLiQ line whose highest common denominator of the sampling times is less than 125 µs. 58: Nodes have been identified on the DRIVE-CLiQ line whose highest common denominator of the sampling times is less than 250 µs. 99: Inconsistency of cro ss drive objects detected. 116: Recommended clock cycle in r0116[0...1]. Note: The topology rules should be noted when connecting up DRIVE-CLiQ. The rules are, provided in the following document: SINAMICS S120 Function Manual Drive Functions The parameters of the sampling times can al so be changed with automatic calculations. Remedy: - check the DRIVE-CLiQ cables. - set a valid sampling time. See also: p0115, p0799, p4099 SINAMICS-Alarms

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 201223 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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