9
05.01
9.5 Using programmable safety components
9-377
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Checking the PFH value of the complete safety func-
tion
Table 9-23
PFH value of the complete safety function
Parameter
PFH value
PL
Comment
SENSE
2,47 x 10
-8
/ h
e
Position switches –S4 and –S5
EVALUATE
2 x 5,4 x 10
-11
/ h
e
Safety relays –A2 and –A3
RESPOND
5,5 x 10
-7
/ h
d
Switching elements –K1(–A11...–A16),
–K2, –K3, –K4, –K5 and –K6
Total
5,74 x 10
-7
/ h
d
<1 x 10
-6
/ h
As a consequence, the requirements regarding PLd with Category 3 for the pro-
tective door safety function are fulfilled.
EMERGENCY STOP safety function
This safety function corresponds, regarding its implementation, the explanation
and information given in Chapter 9.4.2 ”Supplementary safety function EMER-
GENCY STOP for an axis”. Only in the RESPOND area, in channel 1, the addi-
tional safety relay –K1 has been added. This must also be taken into account
when calculating the RESPOND subsystem.
The SENSE and EVALUATE subsystems are not affected by this.
–S3
–A1
–A2
–A3
–K1
(–A16)
–K5
–K6
–K2
–K1
(–A12)
...
–K1
(–A11)
Fig. 9-21
Block diagram of the safety function, EMERGENCY STOP for six axes
9.5
Using programmable safety components
The circuit examples in Chapter 9.4 ”Application examples” are, for reasons of
transparency, configured using separate safety relays.
The logic component of the described safety functions can be implemented
using programmable safety components, such as a fail–safe PLC systems, or
the modular MSS safety system.
The safety relays can be monitored using software in the logic section. This
means that the contactor relays can be eliminated.
9 Cabinet Design and EMC
02.12
