Special Unit Layout Error (I/O Points/Module Count Exceeded)
Mitsubishi Electric · MELSEC System Q/L Series
¿Qué significa 2124 ?
This error indicates an incorrect layout or excessive configuration of special units (modules) on the base unit. It occurs when the number of connectable modules exceeds 10, when a module causes total I/O points to exceed 4096 (for L26CPU-BT) or 1024 (for L02CPU), or if a module is installed across an I/O point boundary. This fault results in the CPU stopping operation.
Causas comunes
- The total number of connectable modules on the base unit has exceeded the limit of 10 modules.
- An installed module causes the total I/O points to exceed 4096 (L26CPU-BT) or 1024 (L02CPU).
- A module is installed in a position that causes its I/O points to cross the 4096 or 1024 I/O point boundary.
- Potential hardware failure of the CPU module, I/O module, intelligent function module, or END cover if the error persists after corrective actions.
Pasos de reparación & Lista de verificación
Haga clic en los pasos para seguir su progreso.
- 1
Reduce the number of connectable modules to 10 or less.
- 2
Remove any module that causes the system's total I/O points to exceed 4096 (for L26CPU-BT) or 1024 (for L02CPU).
- 3
Replace the module installed at the end of the base unit with one whose occupied I/O points do not exceed the limit of 4096 or 1024 points.
- 4
Reset the CPU module and attempt to transition it to RUN mode.