15
10.3.1 Pneumatic control categories
INFORMATION
►
Please note that the connection to the A marking is used for product locking.
►
Please note that the connection to the B marking is used for product unlocking.
The following examples show two control categories. In accordance with EN ISO 13849-1, the product can be controlled so
that the required performance level is achieved.
INFORMATION
The product can be actuated and operated using any control architecture in accordance with EN ISO 13849-1.
The deciding factor here is which performance level PL
r
should be achieved.
►
Please note the MTTF
d
values of the safety-related parts of the control system (SRP/CS) being used as well as
the degree of diagnostic coverage (DC) achieved.
INFORMATION
The secure holding of coupled tools must be taken into account as this is a relevant safety function for the
product.
Risk prevention can be achieved through the use of various protection measures, both via SRP/CS measures as
well as via non-SRP/CS measures. The goal of the protection measures is to reach a safe status.
Measures for fault prevention suffice for applications with a risk of PL
ra
to PL
rc
.
For applications with a risk higher than PL
rd
to PL
re
, the structure of the SRP/CS can provide the measures to
avoid, note or tolerate the faults.
Suitable measures include redundancy, diversity and monitoring in accordance with EN ISO 12100-2:2003,
Section 3 and EN IEC 60204-1:2000.
10.3.1.1 Control category 1 example
Single-channel
The mechanical component (spring) is
supported by the pneumatic component
(pressure).
Both components alone cannot maintain the
safety function.
• Proven components
• 0 Fault detection
• Activation via a 5/2-way valve
Ö
PL
c
is achieved.
In order to achieve the safety function, the use
of proven components in accordance with
EN ISO 13849-1, Chapter 6.2.4 are sufficient.
•
Magnetic field sensors S3 and S4 are
available for the final position check.
1
2
3
4
5
WWR
V2
A
B
S3
S4
S3
S4
G
G
WWR
A
B
Control signal
"locked"
Control signal
"unlocked"
Unlocked
Locked
Unloc
ked
Loc
ked
INSTALLATION AND OPERATING INSTRUCTIONS:
WWR
DDOC00227 / p
EN / 2023-05-15
Zimmer GmbH • Im Salmenkopf 5 •
77866 Rheinau, Germany •
+49 7844 9138 0 • www.zimmer-group.com
Summary of Contents for WWR Series
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