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Safety function blocks
378
02/16 MN05013001Z EN
Example 1 - Architecture of category 4 in accordance
with EN ISO 13849-1
Monitoring of a 2-channel emergency-stop switch and cross-
circuit monitoring of its external wiring. The actuation of the
pushbutton triggers the emergency-stop function. Releasing
the Reset button after the removal of the hazard initiates the
re-enabling in a controlled manner. The discrepancy time is
set for 0.5 seconds.
The break contacts of the emergency-stop switch S1 are
connected to the device terminals IS9 and IS10 and are
provided with the test signals T3 and T4. The safety device
outputs QS1 and QS3 switch the contactors Q1 and Q2
directly. The enable is initiated by the function block after the
emergency-stop switch has been released and the Reset
button has been actuated.
This looks as follows in the electrical circuit diagram:
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