4630

Navigate to Diagnostics > Parameters > Machine Data (MD) and locate $MN_HANDWHEEL_MODULE. Note the module index value (e.g., 1).

Check $MN_HANDWHEEL_LOGIC_ADDRESS[index] where index matches the module number from step 1. Verify the array element contains a valid PROFIBUS logical address (typically 0-125). If the element is empty, zero, or contains 255 (invalid marker), the entry is missing.

An address value of 255 or -1 indicates the entry was never configured.

If the array entry is missing, assign a valid PROFIBUS logical address using HMI > Service > Machine Data, or edit via SINUMERIK Operate. Coordinate with your PROFIBUS master configuration to ensure no address conflicts.

After correction, perform a warm restart (Diagnostics > System > Restart) or full power cycle to reload NCK parameter tables and verify alarm 4630 clears.

Changes to handwheel PROFIBUS addressing require system restart; online changes alone will not resolve this alarm.

Access Machine Data editor and check the dimensioning of $MN_HANDWHEEL_LOGIC_ADDRESS[]. Note the array size (e.g., 4 elements = valid indices 0-3).

Verify $MN_HANDWHEEL_MODULE value does not exceed (array_size - 1). If $MN_HANDWHEEL_MODULE = 4 but array size is 4, the index is out of bounds.

Array indexing in SINUMERIK is zero-based; a 4-element array supports indices 0, 1, 2, 3 only.

If the module index is intentional, increase the array dimension of $MN_HANDWHEEL_LOGIC_ADDRESS[] via Machine Data or resize via SINUMERIK Operate configuration menu, then populate new array elements with valid PROFIBUS addresses.

If the module index is a configuration error, correct $MN_HANDWHEEL_MODULE to reference an existing array index and restart the system.

Access the PROFIBUS configuration tool (typically HW Config or Automation Studio within SINUMERIK or TIA Portal). Verify that a handwheel slave device is listed and assigned to the logical address stored in $MN_HANDWHEEL_LOGIC_ADDRESS[].

If the handwheel device is missing from PROFIBUS configuration but $MN_HANDWHEEL_MODULE and $MN_HANDWHEEL_LOGIC_ADDRESS[] are populated, either re-add the handwheel device to PROFIBUS and reassign its address, or clear the parameter entries if the handwheel is no longer in use.

Removing a handwheel from active use requires clearing both $MN_HANDWHEEL_MODULE and its corresponding $MN_HANDWHEEL_LOGIC_ADDRESS[] entry to prevent alarm 4630.

If re-configuring, download the updated PROFIBUS configuration to the 840D NCK and verify the handwheel logical address matches the value in $MN_HANDWHEEL_LOGIC_ADDRESS[].