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Navigate to Siemens 840D HMI: Menu > Parameters > Machine Data > MD18082 'SwivHeadExchange'. Verify current setting (0=disabled, 1=enabled).

If machine has physical swivel head hardware, set MD18082 to '1' (Yes/enabled). Save and perform warm restart of control (do not power cycle unless required).

Changing this parameter requires appropriate access level (typically Maintenance or Service password).

Verify dependent parameters: MD18083 'SwivHeadType', MD18084 'SwivHeadAxis', and MD18085 'SwivHeadPreset' are correctly configured for your swivel head model.

Re-run the NC program block. The E_TCARR or F_TCARR function should now execute without alarm 61226.

Open the NC program source (usually *.mpf or *.spf file). Locate block %2 mentioned in alarm message. Identify the E_TCARR or F_TCARR call and its parameters.

Verify that machine preconditions are met before swivel head exchange: spindle orientation active (M19), tool magazine at reference position, and no axis motion in progress. Check with machine builder documentation for your specific model.

If swivel head is not installed on this machine, either comment out the E_TCARR/F_TCARR block in the NC program or create a conditional block using machine data read (SETDNO function) to skip if MD18082=0.

Re-compile and reload the NC program into the 840D control memory via DNC or local memory manager.

Perform physical inspection of the machine tool: check for swivel head mounting bracket, actuator rod/cylinder, and pneumatic/hydraulic line connections. Verify all fittings are torqued and hoses are not kinked or disconnected.

Lock out the machine and disable air/hydraulic supply before inspection if required by site safety procedures.

If swivel head hardware is confirmed installed, test actuator response: manually command a low pressure test (if pneumatic) or apply voltage to solenoid (if electric). Listen/feel for movement and check for leaks.

Check Siemens 840D I/O diagnostics (Menu > Diagnostics > Inputs/Outputs > Swivel Head signals) to confirm feedback sensors (position switches or analog position transducers) are recognized and responding.

If hardware is not installed or irreparable, contact machine OEM to obtain correct hardware or request software customization to disable swivel head functions permanently.