62181

Navigate to Siemens SINUMERIK 840D HMI: Menu > Diagnostics > Machine Data > search for MD20050 (Axis type) for the affected rotary axis (B or C).

Do not modify machine data without authorization; verify axis configuration matches machine capability.

Confirm the axis configuration: if MD20050 = 1 (MANUAL), the axis requires operator positioning. If MD20050 = 2 (AUTOMATIC), verify MD20100 (Drive assignment) is correctly linked to a servo drive in the NCK parameter tree.

If the axis should be automatic but is flagged as manual, contact your Siemens service team or machine builder to reconfigure MD20050 and associated drive parameters (MD20100, MD20110). Reboot the control after any machine data changes via Menu > System > Shutdown > Warm Start.

Improper machine data changes can cause loss of axis calibration or safety violations.

If the axis is correctly configured as manual, acknowledge alarm 62181 on the HMI, then manually position the rotary axis to the displayed angle using the handwheel or pendant, and press Cycle Start to resume CYCLE800.

In the active NC program (using Siemens Editor or HMI Program menu), verify the CYCLE800 call syntax: e.g., 'CYCLE800(angle_B, angle_C, feed_rate)'. Ensure the axis letter matches the machine's rotary axis designation (check machine manual).

Check channel-specific parameters: Navigate to HMI > Diagnostics > Axis Data and confirm the rotary axis (B or C) is listed as 'Active' or 'Ready' in the current channel assignment. If not active, the axis may be assigned to a different channel or disabled.

If the rotary axis is disabled, enable it via Menu > System > Channel Assignment or request operator activation. If it is assigned to another channel, modify the CYCLE800 call or switch active channels before re-running the cycle.

Read the alarm text on the HMI display: it will show the axis name and required angle in degrees (e.g., 'Set rotary axis B: 32.5 [grd]'). This is the target position the operator must achieve.

Using the machine's handwheel, pendant, or manual axis control, rotate the specified axis to the displayed angle. Most Siemens 840D machines show live axis position feedback on the HMI; align the displayed position to the required value (±0.1° typical tolerance).

Ensure the rotary axis movement will not collide with the workpiece, fixture, or tool; verify machine space and safety clearances before manual positioning.

Once the axis position matches the alarm-displayed angle, press the 'Cycle Start' or 'Continue' button on the HMI or machine control panel to resume CYCLE800 execution and dismiss alarm 62181.