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A07851

External alarm 2

Siemens · DCM

Was bedeutet A07851 ?

The BICO signal for 'external alarm 2' was triggered, indicating that the predefined condition for this alarm has been met. This is a user-configurable alarm tied to an external event, sensor, or logic input. The specific cause is defined by parameter p2116.

Häufige Ursachen

  • Input signal connected to parameter P2101 (External alarm 2 trigger) transitioned from 0 to 1, indicating a tripped safety interlock or sensor.
  • A process limit switch (e.g., high-level sensor, over-pressure switch) wired to a digital input, which is mapped to P2101.
  • A PLC output controlling an external warning condition, mapped to the drive's digital input and subsequently linked via BICO to P2101.
  • An over-temperature switch on an external motor or bearing, wired to the drive's digital input to trigger the alarm.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    1. Identify the digital input (e.g., DI0, DI1) that is BICO-connected to parameter P2101 (External alarm 2 trigger).

  2. 2

    2. Monitor the status of the identified digital input using parameter r0722[x] (e.g., r0722[0] for DI0) to verify its current state.

  3. 3

    3. Trace the physical wiring from the identified digital input back to its source (e.g., limit switch, sensor, PLC output).

  4. 4

    4. Inspect the external sensor or switch for its activated state; for example, check if a pressure switch has exceeded its setpoint.

  5. 5

    5. Verify the logic and configuration of the external device causing the alarm, ensuring its operating limits are appropriate for the application.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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