PS075

Navigate to program directory (EDIT > PROG or EDIT > DIR-P depending on control series). Locate the protected program number in the list.

Press OPRT or ATTR soft key to view program attributes. Check if write protection symbol (lock icon or 'P' indicator) is displayed next to program.

If protection is enabled, select the program and press PRCT (Protect) soft key or toggle attribute setting to disable write protection. May require parameter 3202.0 (Program Protection Enable) set to 0 or accessing via SYSTEM > PMC LADDER > PROTECT menu depending on control generation.

Ensure you have authorization to remove program protection. Some shops intentionally protect proven programs to prevent accidental modification.

If PRCT soft key is not available, check parameter 3202.0 and 3202.1. Set parameter 3202.0=0 to allow program protection changes. After removing protection, attempt edit or delete operation again.

Navigate to SYSTEM > PARAM and search for parameter 3202 (Program Protection Settings). Check bit 0 (PRG) and bit 4 (KEY) settings.

Check parameter 3290.6 (O8000-O8999 protection) and 3290.7 (O9000-O9999 protection) if attempting to edit programs in these protected ranges. Set to 0 to allow editing.

Parameters in 8000 and 9000 series are often macro or subprogram libraries. Verify with production before unlocking.

Verify parameter 0000 (Write Protection Parameter). Ensure bit 0 is set to 0 to allow parameter writes. If locked, use key switch on operator panel to 'EDIT' or higher position and set 0000.0=0.

Parameter 0000 protects against accidental parameter changes. Return to protected state after completing necessary edits.

Power cycle the control (RESET + power off/on) after parameter changes to ensure new protection settings take effect. Reattempt program edit or delete operation.

Verify key switch on operator panel is set to 'EDIT' or higher position (not MDI or MEM). Some controls require 'EDIT' position to modify protected programs.

Check parameter 3210 (Protection Level). If set to values 1-4, password protection is active. Navigate to SYSTEM > PROTECT or SYSTEM > PASSWORD screen and enter correct protection code to gain edit access.

Review parameter 3202.2 (Edit Lock) and 3202.4 (Key Protect Enable). If bit 4=1, key switch must be in specific position. Set 3202.2=0 to disable edit lock if operationally acceptable.

Document original parameter settings before changes. Protection schemes are often required by quality systems or process control requirements.

If using Data Server or network protection, check parameter 3107.1 (Programmer Protection). Set to 0 to allow local program editing. Verify no active PMC ladder logic enforcing additional protection via G signals.