Code 15150: [Channel %1: ] Block %2 reload from external aborted
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 reload from external aborted alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Parameters: %1 = Channel number %2 = Block number, label Definitions: Execution from external was aborted because the reload buffer does not have enough machine function blocks (traversing bl ocks, auxiliary function, dwell time etc.). Background: When already executed machine function blocks are released, memory be comes available in the reload buffer. If machine function blocks are no longer released, nothing can be reloaded - this results in a deadlock situation. Example: Definition of extremely long curv e tables via execution from external. Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: Insert machine function blocks in the part progam. - Increase the size of the reload buffer (MD18360 $MN_MM_EXT_PROG_BUFFER_SIZE). - Decrease the size of the curve table (Note: Blocks within CTABDEF/CTABEND are not machine function blocks). Program Continuation: Clear alarm with the RESET key. Restart part program
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 15150 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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