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ErrorLib — Industrial Fault Code Library

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231-A003

SPLC commissioning mode active

Heidenhain · TNC CNC Controllers

What does 231-A003 mean?

This error indicates that the Safety PLC (SPLC) commissioning mode is still active. This happens when the CRC check of the SPLC program is deactivated (machine parameter CfgSafety --> commissioning is set), which is typically done during machine setup but must be deactivated before machine delivery for safe operation.

Common Causes

  • CRC check of the SPLC program is deactivated (machine parameter CfgSafety --> commissioning is set).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Deactivate the commissioning mode by resetting the 'commissioning' setting in the machine parameter CfgSafety.

  2. 2

    Verify that the CRC check of the SPLC program is enabled after deactivating commissioning mode.

  3. 3

    Confirm that the machine is ready for production operation with all safety features active.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

Related Faults

231-A001Cancelation of brake-test call monitoring231-A002Cancelation of brake-line-test call monitoring231-A004Short circuit on 24 V of the T.BRK.B signal
Source: Heidenhain TNC CNC Controllers
Open Manual (Page 454)Search more codes in this manual