Phoenix Contact Axioline F, User Manual, Page: 40 / 86

AXL F PSDO8/3 1F
40
PHOENIX CONTACT 105739_en_04
6.4 Single-channel assignment of safe outputs
Figure 6-2 Single-channel assignment of outputs
In order to achieve Cat. 3 or PL d with single-channel assignment of the outputs:
• Use a two-channel actuator.
The two-channel operation of the actuator with the corresponding connection is
represented on a gray background.
The failure detection time is 20 ms. 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 force-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 safe application program.
Make sure that a single error does not result in the loss of the
safety function.
x
Test the shutdown capability of the actuators at regular
intervals for test pulses that are disabled.
x x
An accumulation of errors must not result in the loss of the
safety function. Following the third error, evaluation can be
aborted if the probability of further errors occurring is low.
x
Measure Cat. 2 Cat. 3 Cat. 4
73421005
K2 (R)
K1 (R)
K1
K2
OUT1_Ch1
GND
M
WARNING: Loss of safety function
Parasitic voltages can result in the loss of the safety function.
• Connect the actuator ground to the ground terminal point of the corresponding output
on the Axioline F connector. An external ground may not be used.