Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 366

02.12
05.01
EVALUATE subsystem
In this example, the EVALUATE subsystem is implemented in the form of two
SIRIUS 3TK2842 safety relays. The safety relays have instantaneous and de-
layed electromechanical enable circuits.
Device –A3 is used to provide a safety–related time delay when switching off
and is controlled via the cascading input, terminal 1. Both devices –A2 and –A3,
are used to evaluate the door switch and the feedback signals from the contac-
tor relays.
Table 9-12
Safety relays 3TK2842 –A2 and –A3
PFH
Service life
Performance Level
Result
PFH
Performance Level
RESPOND subsystem
The RESPOND subsystem has a two channel structure. The first channel com-
prises safety relay –K1 and contactor relay –K6. Line contactor –K2 and contac-
tor relays –K3, –K4 and –K5 form the second channel.
In this example, the RESPOND subsystem has a two channel structure with
different demand rates per channel. A dangerous fault in channel 1 means that
channel 2 is immediately called with its monitoring options.
Components –K1, –K3, –K4 and –K6 are tested by –A2 or –A3 at each start.
Contactor –K2 and contactor relay –K5 are tested by –A1 at each start.
An accumulation of faults in channel 2 between two consecutive actuations of
the EMERGENCY STOP pushbutton is not detected.
S
S
This structure corresponds to Category 3, according to EN ISO 13849–1:2008.
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SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Parameters for the EVALUATE subsystem
Parameter Value
5,4 x 10
d
T1 = 20 Jahre
PLe
1,08 x 10
d
PLd
Basic as well as well–proven safety principles – such as the requirements
regarding Category B – are maintained. Protective circuits are provided.
Protective circuits are provided.
When a component fails, the safety function is always maintained.
The failure is detected.
9 Cabinet Design and EMC
9.4 Application examples
Comment
-11
/h Manufacturer's data
Manufacturer's data
with Category 4
-10
/h PFH = PFH (–A2) + PFH
d d
with Category 4
(–A3)
d
9-365
9