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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 301714 - Axis drive transmission length SSI direct measuring system
Alarm 301714 fires when the SSI encoder's configured transmission length (MD 1041 $MD_NO_TRANSMISSION_BITS_DM) is insufficient to accommodate all parameterized bits across multiturn (MD 1031), singleturn resolution (MD 1032), and additional encoder bits (MD 1037). This configuration mismatch prevents proper data frame construction for the direct measuring system.
301714
Siemens 301714 - Axis drive transmission length SSI direct measuring system
Axis drive transmission length SSI direct measuring system
Configuration of the direct measuring system is faulty for SSI encoder: MD 1041 $MD_NO_TRANSMISSION_BITS_DM (SSI transmission length) is smaller than the number of all parameterized bits in MD 1031 $MD_ENC_ABS_TURNS_DIRECT (multiturn), MD 1032 $MD_ENC_ABS_RESOL_DIRECT (singleturn) and MD 1037 $MD_ENC_CONFIG_DIRECT Bit 14 (alarm bit) and MD 1037 $MD_ENC_CONFIG_DIRECT Bit 12 (parity bit) 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 301714 fires when the SSI encoder's configured transmission length (MD 1041 $MD_NO_TRANSMISSION_BITS_DM) is insufficient to accommodate all parameterized bits across multiturn (MD 1031), singleturn resolution (MD 1032), and additional encoder bits (MD 1037). This configuration mismatch prevents proper data frame construction for the direct measuring system.
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 Siemens HMI or SINUMERIK Operate interface and navigate to Diagnosis > Axis > [affected axis] > Machine Data (MD) section.
- 2
Verify MD 1041 value against encoder datasheet. Calculate required frame length: (MD 1031 multiturn bits) + (MD 1032 singleturn bits) + (MD 1037 additional bits) must be ≤ MD 1041.
Typical SSI frames are 25-33 bits; confirm exact requirement from encoder manufacturer specifications.
- 3
If calculation shows MD 1041 is too small, increase MD 1041 to match total bit requirement or reduce parameterized bits if encoder capability allows.
- 4
Save machine data, perform warm restart (NC Start), and verify alarm clears during axis enable sequence.
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