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Siemens SINUMERIK Controller
Tool Changer · Intermediate · 30-120 minutes
Siemens 840D 104243 - Illegal magazine number
Alarm 104243 occurs when the NC program references a magazine number that does not exist in the machine configuration or exceeds the valid range defined in the tool management system. This typically happens due to programming errors, incorrect magazine addressing, or misconfigured tool management parameters in the control system.
Siemens 840D 104243 - Illegal magazine number
Illegal magazine number
Siemens SINUMERIK alarm 104243: Illegal magazine number. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
Root Cause Summary
Alarm 104243 occurs when the NC program references a magazine number that does not exist in the machine configuration or exceeds the valid range defined in the tool management system. This typically happens due to programming errors, incorrect magazine addressing, or misconfigured tool management parameters in the control system.
Safety
Causes and Fixes
Review the NC program line where the alarm occurred and identify the magazine number being called (check T-codes, tool change commands, or explicit magazine references).
Access the tool management screen (e.g., via HMI > Machine > Tool Management) and verify the valid magazine numbers configured in the system.
Cross-reference the program's magazine number against the configured magazines. Check MD18100 $MN_MM_NUM_MAGAZINE to confirm the total number of magazines defined.
Modifying machine data may affect multiple operations - document original values before changes.
Correct the NC program to use a valid magazine number within the configured range (typically 1 to the maximum defined magazine count), or add the required magazine to the configuration if needed.
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