PS0016

Press SYSTEM > PARAM and check parameter 3001 (maximum sequence number allowed). Note the current setting, typically 99999 for 5-digit or 999999999 for 9-digit systems.

Access the program causing the alarm via EDIT mode, press SEARCH > ADDRESS and enter 'N' to locate the offending sequence number. Check if any N word exceeds the parameter 3001 limit.

Edit the program to reduce the sequence number below the parameter 3001 limit, or increase parameter 3001 if operationally acceptable (requires parameter write enable bit 3 in parameter 0000 to be set to 1).

Changing parameter 3001 requires power cycle to take effect. Ensure parameter write protection is re-enabled after modification.

Reset the alarm using RESET button and verify program execution. If using DNC or external program input, check CAM post-processor sequence number output settings.

In EDIT mode, navigate to the alarm line number displayed on the screen. Visually inspect the N word for any alphabetic characters after the number (e.g., N1000A), decimal points, or special characters.

Use the LIST PROG function (EDIT > PROGRAM > [OPRT] > LIST) to output the program to external device or display to verify data integrity. Compare with original CAM output file for discrepancies.

If corruption detected, delete the program using DELETE PROG function and re-transfer using verified communication settings. Check parameter 0020 (I/O channel settings) and parameters 0100-0102 (RS-232 baud rate, stop bits, parity) for proper configuration.

Ensure correct I/O settings to prevent repeated corruption. Use parity checking and lower baud rates (4800 or 9600) for noisy environments.

After successful program re-transfer, execute dry run with parameter 0010 bit 0 (sequence number stop) set to 1 to verify each N word is processed correctly without alarm.

Check if alarm occurred during sequence number search operation. Press SYSTEM > DIAGNOSIS > #0300 to check current search status and target N number being searched.

Verify parameter 3010 (sequence number comparison) bit settings. Bit 0 controls strict N number matching; incorrect setting may cause search function to reject valid sequence numbers.

If using M99 P____ or GOTO statements with sequence number jumps, verify the target N word exists in the program and is within parameter 3001 limits. Use EDIT search function to confirm target sequence presence.

Review parameter 3003 (sequence number increment check) and ensure program sequence numbers follow logical progression if this parameter is enabled. Disable bit if non-sequential N numbers are intentionally used.

Parameter 3003 enforcement varies by control series. 0i-F and 30i/31i/32i systems have enhanced sequence checking that may require adjustment.