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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 8081 - option(s) is/are activated that are not licensed by the license key
Alarm 8081 occurs when one or more software options (Advanced, Dynamic, Optimization packages) are activated in the NCK/PLC configuration but the license key stored in the control does not authorize these features. The NCK reads activated options from machine data parameters and compares them against the license key checksum during startup.
8081
Siemens 8081 - option(s) is/are activated that are not licensed by the license key
option(s) is/are activated that are not licensed by the license key
One ore more options were activated, that are not licensed by the license key entered Control reaction: Alarm display.
Root Cause Summary
Alarm 8081 occurs when one or more software options (Advanced, Dynamic, Optimization packages) are activated in the NCK/PLC configuration but the license key stored in the control does not authorize these features. The NCK reads activated options from machine data parameters and compares them against the license key checksum during startup.
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 Diagnostics > Utilities > License Information via HMI or use SINUMERIK Operate to view currently activated options and license key validity. Document the exact option names shown in the 'Unlicensed Options' field.
Do not attempt to deactivate options without first verifying the correct license key with your Siemens representative.
- 2
Verify MD10200 (System License) and related machine data (MD10201-MD10210) using Diagnostic/Service menu. Cross-reference activated bits against the official license key certificate provided by Siemens.
- 3
Contact Siemens with the control serial number and license key to obtain an updated key matching all activated options, or request a list of which options must be deactivated if license upgrade is not feasible.
- 4
Update the license key via Siemens automation tools (e.g., SINUMERIK Operate or engineering software) following the documented license installation procedure, then perform a controlled restart (warm boot) to reload the license.
License changes require a system restart; coordinate with production scheduling.
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