NORSTAT Safety Relays - Handbuch (Seite 83)

application guide safety relays from riese electronic page 79
A new start is only possible after simultaneous deactivation and new
activation of both inputs S12, S22.
connecting ESPE type 4:
category 4; SIL3; PLe reachable
connecting ESPE type 2:
category 2; SIL1; PLd reachable
1-channel application for monitoring an ESPE (type 2) or safety sensor
with pnp-output (OSSD) and periodic test and monitored start.
Connect the test input of the ESPE to the clocked output S21 of the SAFE
CL and the OSSD of the ESPE to the input S22. The terminal S12 must not
be used.
The bridge S35-S11 enables the one-channel application mode. The start
button is connected to S34/S11. The activation of the semiconductor
outputs of the SAFE CL results from closing and re-opening the start circuit
while the OSSD is activated.
Additional information: The output signal from S21, which is connected with
the test input or with the activation input of the ESPE, is a square wave
signal with the period duration of 140ms, an impulse of 100ms and a break
of 40ms. The signal, read in at S22 from the ESPE, must be delayed 20 ms
at maximum to the source signal at S21.
category 2; SIL1; PLd reachable
S34 S21 S22 S11
A1 S33
+24VDC
A2
START PNP TEST
GND
S35
0VDC
BWS
ESPE
S32
S36 S37
1-channel application for monitoring an ESPE (type 2) or safety sensor
with pnp-output (OSSD) and periodic test and automatic start.
Connect the test input of the ESPE to the clocked output circuit S21 and the
pnp-output to the input circuit S22. The terminal S12 must not be used. The
bridge S34-S12 enables the automatic start mode and the bridge S35 –S11
enables the one channel application. The activation of the semiconductor
outputs happens after the activation of the pnp-output of the ESPE.
Additional information: The output signal from S21, which is connected with
the test input or with the activation input of the ESPE, is a square wave
signal with the period duration of 140ms, an impulse of 100ms and a break
of 40ms.
The signal, read in at S22 from the ESPE, must be delayed 20 ms at
maximum to the source signal at S21.
category 2; SIL1; PLd reachable
S34 S21 S22 S11
A1 S33
+24VDC
A2
START PNP TEST
GND
S35
0VDC
BWS
ESPE
S32
S36 S37
2-channel application for monitoring an ESPE with monitored start
circuit, cross circuit check and contact expansion.
Connect the pnp-outputs of the ESPE to the input circuits S12 and S22 and
the start button to the start circuit S34/S11.
The activation of the outputs results from closing and re opening the start
circuit by activated pnp-outputs.
A new start is only possible after simultaneous deactivation and new
activation of both inputs S12,S22.
For monitoring the external conductors, the NC contacts of the positively
driven contactors must be in series to the start button. forcibly guided
contacts
category 4; SIL3; PLe reachable
S34 S21 S22 S11
A1 S33
+24VDC
A2
PNP TEST
GND
S35
0VDC
BWS
ESPE
S32
S36 S37
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