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Code 230711: <location>SI MM MM: Defect in a monitoring channel

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI MM MM: Defect in a monitoring channel 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: SERVO, VECTOR Reaction: NONE Acknowledge: IMMEDIATELY (POWER ON) Cause: When cross-checking and comparing the two monito ring channels, the drive detected a difference between the input data or results of the monitoring functions and initiated a STOP F. One of the monitoring functions no longer reli ably functions - i.e. safe oper ation is no longer possible. If at least one monitoring function is active, then after the parameterized timer has expired, the message C30701 "SI Motion: STOP B initiated" is out put. The message is output with message value 1031 when the Sensor Module hardware is replaced. Message value (r9749, interpret decimal): 0... 999: Number of the cross-checked data that resulted in this message. Refer to safety message C01711for a description of the individual data. The significance of the individual message values is described in safety message C01711 of the Control Unit. 1000: Watchdog timer has expired. Too many signal changes have occurred at safety-relevant inputs. 1001: Initialization error of watchdog timer. 1005: Pulses already suppressed for test stop selection. 1011: Acceptance test status between the monitoring channels differ. 1012: Plausibility violation of the actual value from the encoder. 1020: Cyc. communication failure between the monit. cycles. 1021: Cyc. communication failure betw een the monit. channel and Sensor Module. 1023: Error during the effectivity test in the Sensor Module. 1030: Encoder fault detected from another monitoring channel. 1031: Data transfer error between the monitoring channel and the Sensor Module. 5000... 5140: PROFIsafe message values. The significance of the individual message values is described in safety message C01711 of the Control Unit. 6000... 6166: PROFIsafe message values (PROFIsafe driver for PROFIBUS DP V1/V2 and PROFINET). The significance of the individual message values is described in safety message C01711 of the Control Unit. See also: p9555 (SI Motion transition time STOP F to STOP B (Control Unit)), r9725 (SI Motion, diagnostics STOP F) Remedy: Re message value = 1030: - check the encoder connection. - if required, replace the encoder. Re message value = 1031: When replacing a Sensor Module, carry out the following steps: - start the copy function for the node id entifier on the drive (p9700 = 1D hex). - acknowledge the hardware CRC on the drive (p9701 = EC hex). - save all parameters (p0977 = 1). - carry out a POWER ON (power off/on) for all components. The following always applies: - check the encoder connection. - if required, replace the encoder. Re other message values: - The significance of the individual message val ues is described in safety message C01711 of the Control Unit. Note: This message can only be acknowledged via the Terminal Module 54F (TM54F) or PROFIsafe. See also: p9300 (SI Motion monitoring clock cycle (Motor Module)), p9500 (SI Motion monitoring clock cycle (Control Unit)) 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 230711 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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