Code 14823: [Channel %1: ] Block %2 error on selection or deselection of tool monitoring
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 error on selection or deselection of tool monitoring 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: On selecting tool monitoring with TMON, one of the following errors occurred: - Selection does not refer to a grinding-specific tool (400-499). - Selection refers to an invalid spindle number. - An attempt has been made to select tool monitori ng for a spindle that is already assigned to another tool by TMON, GWPSON, CLGON or ac tivation of tool length compensation. - An attempt has been made to select a tool that has not been defined. - An attempt has been made to select an edge (implicitely) that has not been defined. (Implicit selection: D1 of a tool, if no edge has been specified.) - An attempt has been made to select tool monitoring for the active tool, although no tool length compensation has been activated. - Invalid parameter number for radius calculation in $TC_TPG9. The following values are valid: 3 for $TC_DP3 (length 1) 4 for $TC_DP4 (length 2) 5 for $TC_DP5 (length 3) 6 for $TC_DP6 (radius) A grinding wheel radius equal to zero has been specified. On deselecting tool monito ring with TMOF, one of the following errors occurred: - Deselection does not refer to a grinding-specific tool (400-499). - An attempt has been made to deselect tool monitori ng for the active tool, although tool length compensation is not active. - Deselection refers to an invalid spindle number. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Check TMON and TMOF command. Check tool compensation data. - $TC_DP1: 400 - 499. - $TC_TPG1: Spindle number. - $TC_TPG8: Inclination angl e for slope grinding wheel. - $TC_TPG9: Parameter number for radius computation, e.g. 3 for $TC_GP3. 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 14823 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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