Code 18202: [Channel %1: ] Block %2 curve table: instruction CTABEND without CTABDEF not allowed
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 curve table: instruction CTABEND without CTABDEF not allowed 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: The CTABEND instruction, which is used to terminat e the definition, has been programmed in the program without starting a curve table definition with CTABDEF, or the CTABDEF and CTABEND instructions were not programmed in the same program level. Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. Remedy: Remove the CTABEND command or add the CTABDEF(..) command at the appropriate program location. The CTABDEF and CTABEND instructions must be programmed in the same program level (main or subprogram). Start the program again. 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 18202 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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