What causes Siemens SINUMERIK alarm 18202?

CTABEND instruction executed without a preceding CTABDEF instruction in the same program block or subroutine. CTABDEF and CTABEND instructions programmed at different nesting levels or in different program modules. CTABEND instruction orphaned due to incomplete or deleted curve table definition block. Syntax error where CTABDEF block was commented out or skipped during program execution. Curve table definition interrupted by program jump or conditional logic that bypasses CTABDEF.

How do I fix Siemens SINUMERIK alarm 18202?

1. Review the NC program around block %2 in channel %1; verify CTABDEF appears before CTABEND at the same program nesting level 2. Search the entire program and called subroutines for all CTABDEF and CTABEND pairs; confirm each CTABDEF has a matching CTABEND in the same scope 3. Check program structure for conditional statements, jumps (GOTOF, GOTOB), or subroutine calls that may prevent CTABDEF execution before CTABEND 4. Verify no CTABDEF blocks are commented out or disabled; uncomment or restore missing curve table definitions as needed 5. Test program logic flow by tracing execution path through DCC (Diagnostic and Configuration Center) to confirm CTABDEF reaches execution before CTABEND

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 18202

Siemens 840D 18202 - Channel block curve table: instruction CTABEND without

The CTABEND instruction, which is used to terminate 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.

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

18202

Siemens 840D 18202 - Channel block curve table: instruction CTABEND without

Channel block curve table: instruction CTABEND without

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

CTABEND instruction executed without a preceding CTABDEF instruction in the same program block or subroutine
CTABDEF and CTABEND instructions programmed at different nesting levels or in different program modules
CTABEND instruction orphaned due to incomplete or deleted curve table definition block
Syntax error where CTABDEF block was commented out or skipped during program execution
Curve table definition interrupted by program jump or conditional logic that bypasses CTABDEF

Troubleshooting Steps

1Review the NC program around block %2 in channel %1; verify CTABDEF appears before CTABEND at the same program nesting level
2Search the entire program and called subroutines for all CTABDEF and CTABEND pairs; confirm each CTABDEF has a matching CTABEND in the same scope
3Check program structure for conditional statements, jumps (GOTOF, GOTOB), or subroutine calls that may prevent CTABDEF execution before CTABEND
4Verify no CTABDEF blocks are commented out or disabled; uncomment or restore missing curve table definitions as needed
5Test program logic flow by tracing execution path through DCC (Diagnostic and Configuration Center) to confirm CTABDEF reaches execution before CTABEND

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