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SG, safety gate (optionally
with guard locking)
477
02/16 MN05013001Z EN
Example 2 - Architecture of Category 4 according to
EN ISO 13849-1
2-channel monitoring of a safety gate with guard locking
and cross-circuit monitoring of its external wiring. The actu-
ation of the release button opens the guard, the safety gate
is enabled and removes the enable from the hazardous
movement. Pressing the Reset button after the safety gate
closes initiates the re-enabling. The discrepancy time is set to
0.5 seconds.
The safety gate is monitored with a safety position switch B1
with a tumbler and another position switch B2. Both limit
switches and the feedback of the tumbler are fed with test
signals T1 to T3 and are connected to device inputs IS2, IS5
and IS6. Safety device outputs QS1 and QS2 switch contac-
tors Q1 and Q2 directly. The function block issues the enable
after the safety gate is closed and the reset pushbutton that
is connected to IS9 is activated.
This looks as follows in the electrical circuit diagram:
Содержание easySafety
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