126-0111

Enter parameter programming mode

Press MOD key, enter password if required, select 'Machine Parameters' from the menu. Navigate to parameter group MP7310.x (Emergency Stop Configuration).

Do not modify safety-related parameters without proper authorization and documentation. Incorrect changes can compromise machine safety.

Document current switch-off port configuration

Record all entries in MP7310.0 through MP7310.15 (or applicable range). Note which physical outputs (X1xx) are assigned as switch-off ports. Count total assignments.

Use TNCguide documentation for your specific control model to verify maximum allowed switch-off ports - typically 4 for TNC 320, 6-8 for TNC 530/620/640.

Identify redundant or unnecessary assignments

Review machine safety circuit design to determine which outputs are truly required for emergency stop functions. Look for duplicate assignments or test outputs that should not be safety-rated.

Switch-off ports are typically reserved for safety contactors, brake releases, and spindle motor disconnects. Ancillary equipment like coolant or chip conveyors should use standard outputs.

Remove excessive assignments

Delete entries from MP7310.x parameters that exceed the limit or are non-essential. Ensure remaining assignments match physical safety circuit design. Save parameters and perform a control restart.

Verify safety circuit integrity after parameter changes. Test emergency stop function before returning machine to production.

Access PLC program editor

Press MOD key, select 'PLC' from the menu, then 'EDIT PLC PROGRAM'. Alternatively, use TNCopt software on a connected PC to open the PLC file for better search capabilities.

If using TNCopt, make a backup copy of the PLC program before editing. Save as PLCxxx_BACKUP.H with current date.

Search for switch-off port definitions

Use search function (FIND or CTRL+F) to locate all instances of 'SWITCH_OFF', 'EMERGENCY', 'SAFE_OUT', or similar keywords. Also search for output assignments to X-series addresses in the safety range (typically X110-X130).

Look for assignment patterns like 'M_SWITCH_OFF[0]' through 'M_SWITCH_OFF[n]' or direct output assignments 'X110 = ' in the PLC logic.

Count and catalog all switch-off definitions

Create a list of all switch-off port assignments found in the PLC program. Note line numbers and whether assignments appear in main program or included modules. Verify total count against control specifications.

Do not modify PLC program logic without understanding the complete safety circuit design. Consult machine builder documentation and electrical schematics.

Consolidate or remove excessive definitions

Comment out or delete switch-off port assignments that are redundant or non-essential. If multiple outputs control the same safety function, consider combining logic. Save modified PLC program.

Use comment lines (;) to disable assignments rather than deleting them initially. This allows easy restoration if changes cause issues.

Compile and test PLC program

Exit editor and select 'COMPILE PLC' from PLC menu. Verify compilation completes without errors. Restart control and verify alarm 126-0111 clears. Test all safety functions before production use.

After PLC changes affecting safety outputs, perform complete emergency stop testing including all stop buttons, guards, and interlocks.

Identify all active PLC modules

In MOD > PLC menu, check which PLC files are loaded. Look for main PLC program plus any user modules (UPLC files) or library includes. Note all filenames and their loading sequence.

Check machine parameter MP7210 (PLC Program Selection) to verify which PLC program file is designated as active. Multiple programs may exist but only one should be active.

Audit each module for switch-off ports

Open each PLC file separately and count switch-off port definitions in each. Create a table showing: module name, number of switch-off ports defined, specific outputs used. Sum totals across all modules.

User modules (UPLC) are often overlooked sources of duplicate safety output assignments. Check folders TNC:\plc and TNC:\plc\user for all .H and .PLC files.