141-004D

Verify KEY switch position

Turn the physical KEY switch on the control panel to position 2 (Setup/MDI) or position 3 (Programming). Position 0 (locked) and 1 (Operating) restrict most parameter changes.

Position 3 provides full access but should only be used during setup - always return to position 1 for production to prevent accidental changes.

Attempt modification again

After changing KEY position, navigate back to the parameter or table entry and attempt the modification. The control should now accept the change.

Some parameters require machine to be de-referenced or powered down before modification is accepted.

Stop all program execution

Press the STOP button to halt any running program. Check Program Run mode and ensure no background processing is active. Look for 'PGM' indicator on status bar.

Even programs paused in mid-cycle can lock tables - use Internal Stop or reset to fully clear locks.

Reset control mode

Press the END key or select Manual Operating mode. Navigate to Programming & Editing mode if modifying tool or preset tables to ensure proper context.

Resetting may clear modal information - document current tool and preset offsets before proceeding.

Check PLC marker status

Access PLC Programming mode (MOD > PLC > Display) and check for active M_MARKER variables related to table protection (commonly M_MARKER 1020-1030 range for table locks). Contact machine builder if PLC locks are active.

Machine builders often implement table locks during tool change cycles or specific machine states - consult machine-specific PLC documentation.

Access MOD function

Press MOD key (or select Special Functions > MOD). Navigate to the parameter requiring modification through the MOD menu structure.

MOD function access: Service Engineer level typically uses password '807667' on many machines, but this may be changed by OEM - verify with machine documentation.

Enter appropriate password

When prompted, enter the correct password level: Inspection (typically no password), Setup (machine-specific), or Service (OEM-specific). Navigate to Settings > Password Management to view required access level.

Incorrect password attempts may lock you out temporarily. Never share OEM passwords without authorization.

Verify parameter access rights

In MOD function, parameters show lock symbols if write-protected. Look for closed padlock icon next to parameter name. Open padlock indicates editable with current access level.

Some parameters require both correct KEY position AND MOD password - ensure both conditions are met.

Access configuration directory

In Programming & Editing mode, press PGM MGT key. Navigate to TNC:\ > sys > CfgDyn directory. Locate CfgToolMgt.conf, CfgPgmMgt.conf, or CfgPresetMgt.conf depending on which table triggers alarm.

Modifying system configuration files can affect control behavior - always create backup copies before editing.

Review write protection settings

Open relevant .conf file with text editor (select file, press EDIT). Look for 'writeProtect' or 'readOnly' directives. Check for column-specific restrictions or table-wide protection flags.

Search for 'COL_' entries in tool config - these define individual column properties including edit permissions.