NORSTAT Safety Relays - Handbuch (Seite 94)

application guide safety relays from riese electronic page
90
S12/S22 are only monitored when they were activated after turning on the
power supply.
Category 4, PLe, SIL 3 reachable
Dual channel application for connecting OSSD contacts (pnp) of
an ESPE with monitored start and supply of the ESPE by the
SAFE FLEX.
OSSD1 and OSSD2 have to be connected to the input circuits (S11/S12 and
S21/S22). Connect the start button to S32-S33 and a bridge or a feedback
control loop to S33-S34. The activation of the outputs results from closing and
re-opening of the start button while the outputs of the ESPE are activated
(high-signal).
When the optical way of the light barrier is interrupted the OSSD outputs of the
ESPE turn off (low signal) and the safety outputs of the SAFE FLEX fall off to
the initial state. The contacts 13-14 and 23-24 are opened the auxiliary output
S31 is turned off.
The power supply of the light barrier/ light curtain 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. The
simultaneity is defined by the high signals at the inputs S12 and S22. The
high-signal at the input S22 may be activated maximally 0,5s after the high-
signal at the input S12. A high-signal at the entrance S12 can be activated as
desired after the high-signal at S22. After exceeding the simultaneity a new
cycle can only be started after deactivating the OSSDs. The safety inputs
S12/S22 are only monitored when they were activated after turning on the
power supply.
Category 4, PLe, SIL 3 reachable
S22 S12
S11
S21
A1 S35
S36
A2
+24V DC 0V DC
L+ OSSD1 OSSD2 L-
BWS / ESPE
S32 S33 S34
Kext
Start
Dual channel application for connecting OSSD contacts (pnp) of
an ESPE with automatic start and supply of the ESPE by an
external power supply.
The light barrier / light curtain is supplied by an external power supply. The
negative pole of the light barrier / light curtain is connected additionally to
terminal S36.
Function same as in application 5
Category 4, PLe, SIL 3 reachable
S32 S33 S22 S12
S11
S21 S34
A1
Kext
S35
S36
A2
+24V DC 0V DC
L+ OSSD1 OSSD2 L-
BWS / ESPE
0V DC +24V DCx
Dual channel application for connecting OSSD contacts (pnp) of
an ESPE with monitored start and supply of the ESPE by an
external power supply.
The light barrier / light curtain is supplied by an external power
supply. The negative pole of the light barrier / light curtain is
connected additionally to terminal S36.
Function same as in application 6
Category 4, PLe, SIL 3 reachable
S22 S12
S11
S21
A1 S35
S36
A2
+24V DC 0V DC
S32 S33 S34
Kext
Start
L+ OSSD1 OSSD2 L-
BWS / ESPE
+24V DCx 0V DC
Monitoring of a clocked safety switch with automatic 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 at the safety switch. The timing of the clock for the safety switch is as
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866 Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com