Sample Design - GE RSTi-EP Functional Safety Manual

Chapter3. System Overview

3.2 Sample Design

The following figure exemplifies how to design a safety segment using a EP-19xx module. All output
modules arranged within the safety segment will be switched safely. DI modules can be arranged
within the safety segment, only they do not fulfill any safety function and are not influenced by the
EP-19xx module.
To switch the 24 V Safe voltage back on, either an automatic or a manual start can be selected.
•
Automatic start: the safe output current path is switched on immediately after resetting the
safety circuit(s).
The Automatic Start option should only be used after a risk analysis has shown
that the application is suitable.
•
Manual start: the output current path is only switched on again if the start button has been
held down for a preset length of time.
With the delay SIL module (EP-1922) switching off can be delayed by a defined time so that, for
example, a machine can be shut down in a controlled manner. The delay time can be set in four
steps between 0 and 60 seconds (corresponds to stop category 1 as per EN 60204).
10
Example Set-up of a Safety Segment (1) with EP-19xx
RSTi-EP Functional Safety Manual
Warning
GFK-2956A