System description - Pilz GmbH & Co.

Modules
Voltage supply
PSSu E F BSW(-T)
Connection
][Anschlus BSW
11
21
Periphery Supply
12
22
13
23
14
24
3.3
0 V DC
+24 V DC
=
~
Fuse
PSSu E F BSW/
PSSu E F BSW-T with
- PSSu BS 2/8S(-T)
- PSSu BS 2/8C(-T)
C-rail supply
L1
N
Connect to the 0 V supply and
earth at a single point
If you are using actuators for safety-related
functions, it is essential that you
note the following:
A safety assessment must be made
for each individual application.
Input modules may not be used
within an output block. If an error
occurs, input modules could supply
an external voltage which cannot
be switched off.
The position of each single actuator
must be monitored, e.g. via an FS
feedback loop with test pulses.
To prevent contact welding, a fuse
should be connected before the periphery
supply infeed (see Technical
details).
The following applies for floating
actuators:
All actuator masses must be fed
back to the output modules.
The following applies for earthed
actuators:
The possibility of a short circuit to +
24 V of the external supply voltage
must be excluded.
When using modules of type
PSSu E PD in an output block, please
note the following:
Do not connect capacitive loads.
During the power-up test, the relay
contacts are tested with pulses of
up to 60 ms.
Connection example
Block switching with dual-channel
operation and redundant actuator.
The ST output module PSSu E S
4DO 0.5 belongs to the output
block of the PSSu E F BSW module.
The FS input module for forming the
feedback loop (PSSu E F 4DI with
test pulses) belongs to another supply
group, which is not shut down.
A maximum of Cat. 3 in accordance
with EN 954-1 and SIL2 in accordance
with EN IEC 61508 can be
achieved.
3.3-34
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
PSSu-2011-01