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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 8020 - Option 'activation of more than channels' not set
Alarm 8020 fires when the NC kernel (NCK) attempts to activate a second channel (or additional channels beyond the licensed quantity) but the machine's option configuration does not include the multi-channel activation license. This is a licensing/configuration mismatch between the part program request and the actual system entitlements stored in the machine data.
8020
Siemens 8020 - Option 'activation of more than channels' not set
Option 'activation of more than channels' not set
A 2nd channel has been indicated but the corresponding option does not exist Control reaction: NC Start disable in this channel. Interface signals are set. Alarm display.
Root Cause Summary
Alarm 8020 fires when the NC kernel (NCK) attempts to activate a second channel (or additional channels beyond the licensed quantity) but the machine's option configuration does not include the multi-channel activation license. This is a licensing/configuration mismatch between the part program request and the actual system entitlements stored in the machine data.
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 menu: Diagnostics → Machine Data → Search for MD10200 (or MD10210 for channel-specific settings). Verify the value matches the number of channels your license permits.
Do NOT modify MD parameters without proper authorization and documentation backup.
- 2
Cross-reference the license file (typically stored in /user/license or via SIEMENS service tool). Confirm the option 'activation of more than 1 channel' or equivalent is listed in active licenses.
- 3
If license is valid but MD10200 is incorrect, contact your Siemens service partner to issue a new license key and reload via Diagnostics → System Information → License Management.
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