Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 12460

Siemens 840D 12460 - Channel block maximum number of symbols exceeded with

The max. number of variable definitions (GUD, LUD), macro definitions, cycle programs and/or cycle parameters (PROC instruction) that the controller's data management system is able to handle has been exceeded. If this alarm occurs in conjunction with alarm 15175, not enough memory for the preproces

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

12460

Siemens 840D 12460 - Channel block maximum number of symbols exceeded with

Channel block maximum number of symbols exceeded with

The max. number of variable definitions (GUD, LUD), macro definitions, cycle programs and/or cycle parameters (PROC instruction) that the controller's data management system is able to handle has been exceeded. If this alarm occurs in conjunction with alarm 15175, not enough memory for the preproces

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Excessive number of global user data (GUD) or local user data (LUD) variable definitions in the program
  • Too many macro definitions or PROC instructions loaded simultaneously in memory
  • Large cycle programs or parameter sets consuming available symbol table space
  • Memory fragmentation from repeated program loads without controller reset
  • Attempting to load multiple complex cycle programs beyond controller capacity

Troubleshooting Steps

  1. 1Review the block and channel information in the alarm message to identify which program section is exceeding limits
  2. 2Reduce the number of variable definitions by consolidating GUD/LUD variables into arrays or structures where possible
  3. 3Remove unused macro definitions, cycle programs, or PROC instructions from memory
  4. 4Perform a warm restart (power cycle) of the controller to clear symbol table and reclaim fragmented memory
  5. 5If alarm persists with alarm 15175, verify available memory in controller diagnostics and consider deleting non-essential user-defined cycles or programs

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