Code 14603: [Channel %1: ] Block %2 timeout during execution from external source.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 timeout during execution from external source. 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: If a program is selected for execution from external source, it will be expect ed that the first part program line can be read from the reload buffe r within 60s after part program start. Otherwise, part program processing will be aborted with alarm 14603 due to the assumption that the connection to the HMI or the external device is faulted. Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: Check the connection to the HMI and repeat selection of the program that is to be executed from external source. Diagnostics Manual (DAsl), 03/2009 Program Continuation: Clear alarm with the RESET key. Restart part program - Acknowledge the alarm by pressing the RESET key - Repeat program selection - Start the 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 14603 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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