A valid reset sequence takes place as follows: the change LOW-HIGH-LOW is evaluated
in the safety controller, whereby the HIGH pulse must be present for a duration between
50 ms and 5 s.
The reset is evaluated in the safety system.
This safety function is relevant for the automated reset.
NOTE
Expected frequency for requests of the safety function:
365 / year +52 / year = 417 requests in total per year.
3.7
Additional components required
The following additional components are essential for use of safety system in an appli‐
cation:
•
Emergency stop pushbutton
•
Reset pushbutton
•
Robot controller
•
Additional physical guard (e.g. fencing)
NOTE
All necessary components influence the parameters of the entire application that relate
to safety technology. The components must therefore have an MTTF
D
value suitable for
the entire application and satisfy the necessary performance level.
The necessary performance level results from the risk assessment. For evaluating the
performance level achieved, subsystems for SISTEMA are available under:
For the components included with delivery
see "Scope of delivery", page 52
3.7.1
Emergency stop pushbutton requirements
At least one device for stopping in an emergency must be installed, e.g. emergency stop
pushbutton.
At least two devices for stopping in an emergency (e.g. emergency stop pushbuttons)
must be installed as follows if the automated restart is used:
•
Inside the monitored area - as close as possible to the robot so that the operator
can easily reach the emergency stop pushbutton when in the monitored area close
to the robot
•
Outside the monitored area
Depending on the manufacturer’s risk assessment, it may be necessary to install addi‐
tional emergency stop pushbuttons.
Each emergency stop pushbutton must have two N/C contacts which are both opened
e.g. by pressing the button.
The emergency stop pushbuttons must be designed in accordance with the following
standards:
•
ISO 13850
•
IEC 60204
PRODUCT DESCRIPTION
3
8023421/12KF/2019-01-22 | SICK
O P E R A T I N G I N S T R U C T I O N S | sBot Stop
21
Subject to change without notice
