NORSTAT Safety Relays Benutzerhandbuch

Seite 95

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application guide safety relays from riese electronic page

followed:

T1 and T2 are approximately 60ms. By enabling the clock output S11 the clock
is delayed at the clock output of the safety switch and is read in at terminal
S22. The delay from clock output (S11) to clock input (S22) should be between
1ms and 20ms. Is at terminal S22 a signal detected identical to the signal
provided at terminal S11 the outputs are activated automatically. Is the
detected signal not identical the outputs fall off into the initial state. The
contacts 13-14 and 23-24 are opened. The auxiliary output S31 is inactive.
The power supply of the clocked switch is provided by the SAFE FLEX
(positive pole to S21, negative pole to S36, I

max

= 50mA).

General information:
For this operation mode the terminals S35/S36 must not be bridged. A bridge
or feedback control loop (S32/S33) switches the device into the automatic start
mode.

While turning on the power supply there must not be a signal at the output of
the clocked safety switch. As long as no signal is detected at the clock input
the device stays in a wait state.

Category 4, PLe, SIL 3 reachable

S32 S33

S22

S12

S11

S21

S34

Kext

S35

S36

+24V DC

0V DC

L+

L-

Monitoring of a clocked safety switch with monitored start and

supply of the clocked safety switch by the SAFE FLEX.

The SAFE FLEX provides a clock at terminal S11. Connect S11 to the clock
input TE of the safety switch. The timing of the clock for the safety switch is as

followed:

T1 and T2 are approximately 60ms. By enabling the clock output S11 the clock
is delayed at the clock output of the safety switch and is read in at terminal
S22. The delay from clock output (S11) to clock input (S22) should be between
1ms and 20ms. Is the delayed signal, read in, identical to the signal at the clock
output the outputs of the SAFE FLEX are activated after closing and re-
opening the start button, connected to S32 and S33. In this moment S33 has to
be linked to S34 by a bridge or a feedback control loop. Is the detected signal
not identical the outputs fall off into the initial state. The contacts 13-14 and
23-24 are opened. The auxiliary output S31 is inactive.

The power supply of the clocked switch is provided by the SAFE FLEX
(positive pole to S21, negative pole to S36, I

max

= 50mA)

General information:
For this operation mode the terminals S35/S36 must not be bridged.