What causes Heidenhain alarm 260-0208?

Machine configuration parameter error related to the alarm function. Hardware component failure on the TNC control or connected module. Part program command or sequence not compatible with current machine state. Communication or interface fault between TNC and machine components. Machine tool builder specific configuration issue.

How do I fix Heidenhain alarm 260-0208?

1. Note the complete alarm text displayed on the TNC screen including any parameter values. 2. Check the Heidenhain NC error message manual for alarm 260-0208 for the specific remedy. 3. Power cycle the machine to clear transient faults. 4. Check for related alarms active simultaneously that may indicate the root cause. 5. Contact Heidenhain service or the machine tool builder if the alarm persists.

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Heidenhain Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 260-0208

Heidenhain 260-0208 - Local symbol. Cannot be displayed

HEIDENHAIN alarm 260-0208 occurs when the TNC control cannot display a local symbol due to invalid or corrupted symbol definitions in the PLC program or symbol table. This typically happens when PLC operands are incorrectly defined, missing from the symbol table, or when there's a mismatch between the PLC program and the loaded symbol definitions.

HeidenhainServo/AxisIntermediate30-120 minutes

260-0208

Heidenhain 260-0208 - Local symbol. Cannot be displayed

Local symbol. Cannot be displayed

Root Cause Summary

HEIDENHAIN alarm 260-0208 occurs when the TNC control cannot display a local symbol due to invalid or corrupted symbol definitions in the PLC program or symbol table. This typically happens when PLC operands are incorrectly defined, missing from the symbol table, or when there's a mismatch between the PLC program and the loaded symbol definitions.

Safety

Refer to Heidenhain service manual
Ensure qualified technician performs repairs

Causes and Fixes

1
Access PLC Symbol Management
Press MOD key, select 'PLC' menu, then navigate to 'Symbol table' to check current symbol definitions.
Always backup the working symbol table before making changes
2
Verify Symbol Table Integrity
Check for corrupted entries, missing operand definitions, or syntax errors in the symbol table display.
Do not modify symbol table without proper PLC program documentation
3
Reload Symbol Table
If corruption is found, reload the correct .SYM file from backup or regenerate from the PLC source code using the PLC programming software.
4
Verify PLC Program Compatibility
Ensure the loaded PLC program version matches the symbol table version by checking timestamps and version numbers in the PLC status display.

DIY Feasiblehigh confidence

Call a technician if:

·PLC program source code is not available
·Memory parameter changes don't resolve the issue
·Multiple related PLC alarms persist after troubleshooting

Prevention

Maintain backup copies of working PLC programs and symbol tables
Document all PLC modifications with version control
Regularly verify PLC memory usage doesn't exceed 80% capacity

Common Mistakes

Loading PLC programs without corresponding symbol tables
Modifying symbol definitions without updating the PLC program
Ignoring PLC compilation warnings during program loading

Related Alarms

260-0209 PLC-ERR-001 260-0210

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Always verify with your machine manual or a certified technician before performing service procedures.