Code 15700: [Channel %1: ] Block %2 illegal cycle alarm number %3
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 illegal cycle alarm number %3 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 alarm number Definitions: A SETAL command has been programmed with a cycle alarm number smaller than 60 000 or greater than 67 999. Alarm reaction of Siemens standard cycles: Nos. 61 000 -61 999: Interpreter stop; delete with Reset Nos. 62 000 - 62 999: Compensation block; delete with NC Start Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: Program alarm number in the SETAL instruction in the correct range. 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 15700 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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