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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 27034 - Parameterization of MD [ ] invalid.
Alarm 27034 fires when MD $MN_SAFE_ALARM_SUPPRESS_LEVEL contains an invalid parameterization value outside the permissible range. This machine data parameter controls safety-related alarm suppression behavior in the SINUMERIK 840D NCK, and only specific integer values are accepted by the safety function block validation during startup or parameter download.
27034
Siemens 27034 - Parameterization of MD [ ] invalid.
Parameterization of MD.
The parameterization of machine data is incorrect. This alarm occurs in the following contexts: - An invalid value has been set for MD $MN_SAFE_ALARM_SUPPRESS_LEVEL. - An invalid value has been set for MD $MN_SAFE_RDP_CONNECTION_NR. - An invalid value has been set for MD $MN_SAFE_SDP_CONNECTION_NR 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 27034 fires when MD $MN_SAFE_ALARM_SUPPRESS_LEVEL contains an invalid parameterization value outside the permissible range. This machine data parameter controls safety-related alarm suppression behavior in the SINUMERIK 840D NCK, and only specific integer values are accepted by the safety function block validation during startup or parameter download.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
Access Siemens HMI Operate menu: Parameters > Machine Data > Safety. Locate MD $MN_SAFE_ALARM_SUPPRESS_LEVEL and verify current value against machine manual specification sheet.
Do not modify safety parameters without documented procedure and supervisor approval.
- 2
Cross-reference valid range in machine documentation or control system release notes. Typical valid values: 0 (no suppression), 1 (suppress non-critical), 2 (suppress defined set). Correct any out-of-range entry (e.g., -1, 5, 10, or text strings).
- 3
Download corrected parameter set via HMI or NCK parameter transfer. Perform full POWER ON reset (warm start) and verify alarm 27034 clears from alarm history.
- 4
Document corrected value in machine configuration logbook with timestamp and authorized personnel signature to maintain safety compliance audit trail.
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