Diag3:off, Diag4:1_pulse

Function Block Error

Beckhoff · EL6900 Operating Instructions

What does Diag3:off, Diag4:1_pulse mean?

This diagnostic flashing code (Diag 3 off, Diag 4: 1 uniform flash pulse) indicates a function block error within one of the TwinSAFE groups. This means that a component or logic block in the safety program is not operating as expected, potentially due to incorrect parameterization, invalid inputs, or an internal logic issue.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Ensure that all input signals to the TwinSAFE groups are within their expected ranges and states by measuring actual signal levels if possible.

Source: Beckhoff EL6900 Operating Instructions
Open Manual (Page 54)