22 107026-11-EN FR26 ROW 302 Printed in France
Example 2: Automatic reset with Final Switching Device monitoring
(use of example 7 is recommended)
C1 B1
B2
K2
FSD
C2
C4
B3
Test
K2
Machine stopping
circuitry
K1
FSD
FF-SB14R
Signalling
(relay status)
A3
Signalling
(beam status)
C3 C5
K2K1
A2A1
FSD: Final Switching Device * 220 Ω + 0.22 µF
Do not forget to change the jumper links position (refer to § 8.6)
*
*
K1
In this example, the reset of the safety barrier is automatically performed at power up or after any intrusion in the
detection field. However, if the NO contact of one of the two additional relays K1 and K2 remains welded, automatic
reset is forbidden until the failure is removed. Connecting NC contacts of K1 and K2 between terminals C3 and C5 will
provide a fault-tolerant connection to the machine stopping circuitry.
All external relays are safety relays with
guided contacts.
FSB14_45
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