The control that is connected and all devices responsible for safety must comply with
t
he required performance level and the required category (for example, according to
ISO 13849-1).
4.4.1 OSSDs
Safety switches with local inputs and outputs can be directly integrated into the
mac
hine controller.
DANGER
H
azard due to lack of effectiveness of the protective device
In the case of non-compliance, it is possible that the dangerous state of the machine
may not be stopped or not stopped in a timely manner.
b
Make sure that the following control and electrical requirements are met so the
protective function can be fulfilled.
•
T
he output signals from an OSSD pair must not be connected to each other.
•
In the machine controller, both signals from an OSSD pair must be processed sep‐
arately.
Figure 4: Dual-channel and isolated connection of OSSD 1 and OSSD 2
•
T
he machine must switch to the safe state at any time if at least one OSSD in an
OSSD pair switches to the OFF state.
4 P
ROJECT PLANNING
14
O P E R A T I N G I N S T R U C T I O N S | MLP1 8020169/ZJN1/2018-03-21 | SICK
Subject to change without notice
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