Eaton easySafety Manual page 477

02/16 MN05013001Z EN
Example 1 - Architecture of Category 4 according to
EN ISO 13849-1
2-channel monitoring of a safety gate with cross-circuit
monitoring of its external wiring. When the safety gate
opens, the motor stops and the hazardous movement comes
to a standstill. Pressing the Reset button after the safety gate
closes initiates the re-enabling and the motor is started. The
discrepancy time is set to 0.5 seconds.
The safety gate is monitored with two position switches B1
and B2. Both position switches are supplied with the test
signals T3 and T4. They are connected to the device inputs
IS13 and IS14. The safety device outputs QS1 and QS2
switch directly the contactors Q1 and Q2. The function block
initiates the enable after the safety gate is closed and after
the pressing and subsequent release of the Reset button that
is connected to IS9.
This looks as follows in the electrical circuit diagram:
SG, safety gate (optionally
with guard locking)
473