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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 301715 - Axis drive multiturn SSI direct measuring system invalid
Alarm 301715 occurs when a linear SSI measuring system is incorrectly configured with multiturn capability settings in the NCK axis parameters. SINUMERIK 840D expects linear direct measuring systems to operate without multiturn information, as linear transducers cannot provide rotational turn counts. This configuration mismatch between the physical transducer type and the machine data parameters triggers a safety-critical validation error.
301715
Siemens 301715 - Axis drive multiturn SSI direct measuring system invalid
Axis drive multiturn SSI direct measuring system invalid
Configuration faulty for a linear and direct measuring system with SSI: A linear measuring system cannot have any multiturn information Control reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm.
Root Cause Summary
Alarm 301715 occurs when a linear SSI measuring system is incorrectly configured with multiturn capability settings in the NCK axis parameters. SINUMERIK 840D expects linear direct measuring systems to operate without multiturn information, as linear transducers cannot provide rotational turn counts. This configuration mismatch between the physical transducer type and the machine data parameters triggers a safety-critical validation error.
Safety
- Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Causes and Fixes
- 1
Access HMI Diagnostics > System > Axis Configuration or navigate via SINUMERIK Control Panel > Parameters > Machine Data. Filter for axis number and parameter group 341xx (Measuring System).
- 2
Verify MD 34110 value matches physical transducer type. For linear SSI, correct value is typically 1 (linear absolute). Cross-reference with machine documentation and transducer nameplate.
Do not change MD 34110 while part program is active or axes are powered.
- 3
Check MD 34120 (SSI_Multiturn_Capable) and MD 34130 settings. Ensure MD 34120 is set to 0 (disabled) or FALSE for linear axis configurations. Linear transducers cannot support multiturn protocols.
- 4
Reset NCK via HMI > Service > System > Reset or issue G-code M30 followed by soft reset. Verify alarm clears and axis initializes without 301715 recurrence.
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