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Code 22270: [Channel %1: ] Block %2 maximum tapping speed reached

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 maximum tapping speed reached alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.

Official Troubleshooting Steps

Parameters: %1 = Channel number %2 = Block number, label %3 = Position Definitions: The following additional param eters are output in order to ascertain the problem: 1. 'Position' (without a preceding axis identifier): The maximum feed of the thread axis is reached at the displayed axis position. 2. 'Master spindle': The position control for t he spindle has been changed during thread cutting. This can lead to inaccurate thread cutting. 3. 'Thread axis, velocity': The axis to which the lead refers is displa yed. This cannot follow the spindle specifications. The maximum possible ax is velocity is shown as a parameter. The velocity of the thr ead axis basically depends on: - The programmed thread pitch - The programmed thread pitch change and thread length (G34, G35) - The defined spindle speed (part pr ogram, FC18, synchronized action) - The spindle override (path and indivi dual axis overrides are ineffective) Reaction: Alarm display. Remedy: Reduce the spindle speed (pitch, pitch change). Program Continuation: Clear alarm with the Delete key or NC START.

Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)

Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.

About Siemens SINUMERIK 840D CNC Alarms

Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 22270 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.

Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.

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