User Manual
Chapter 6
GFK-2843A
Jan 2020
Connection examples for safe outputs
39
•
All errors that cannot be detected can result in the loss of the safety function. Take
appropriate measures to prevent such errors. Suitable measures include, for
example, protected cable installation or double insulation. Please note the
information in the following tables.
•
Please take into consideration errors with a common cause.
6.4
Single-channel assignment of safe outputs
Figure 13: Single-channel assignment of outputs
Important
•
In order to achieve Cat. 3 or PL d with single-channel assignment of the outputs, a
two-channel actuator must be used. The two-channel operation of the actuator with
the corresponding connection is represented on a gray background.
•
The failure detection time is 20 ms. This means that high pulses of this width can
occur in the event of an error.
If the application responds to these pulses, use the two-channel assignment of the
outputs.
K1 (R) and K2 (R) represent the forcibly guided N/C contacts for monitoring the state of
the relay (readback contacts). Connect these contacts via safe digital inputs. Evaluate the
readback and therefore the state of the switching elements in the safety logic.
WARNING
Loss of safety function
Connect the actuator ground directly to terminal point GND of the safety module. An
external ground may not be used.
