Code 12554: [Channel %1: ] Block %2 replacement cycle %3 for the predefined procedure is missing.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 replacement cycle %3 for the predefined procedure is missing. 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 %3 = Cycle name Definitions: The replacement cycle that is to be called instead of the predefined procedure is not present / unknown in the control. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Press the NC stop key and select the "Compens ation block" function by pressing the PROGRAM CORRECT softkey. The cursor will posi tion itself in the faulty block. - Correct the name used for the predefined procedure (write error) - Or load the replacement cycle into one of the cycle directories (+ restart) - Or set the machine data bit for the predefined procedure in MD11754 $MN_COUPLE_CYCLE_MASK to 0 so that th e predefined procedure is executed again. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the 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 12554 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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