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Connection examples for safe outputs
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6.4 Single-channel assignment of safe outputs
Figure 6-2 Single-channel assignment of 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 read-
back and thus the state of the switching elements in your safe application program.
Basic specifications
– 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 oc-
cur in the event of an error.
If the application responds to these pulses, use the two-channel assignment of the
outputs.
WARNING: Loss of safety function
Connect the actuator ground directly to terminal point GND of the safety module. Use of
an external ground is not permissible.
73421005
K2 (R)
K1 (R)
K1
K2
OUT1_Ch1
GND
M
Actuator Single-channel Two-channel
Achievable
SIL/SILCL/Cat./PL
SIL 2 / SILCL 2 / Cat. 2/PL c SIL 2 / SILCL 2 / Cat. 3 / PL d
WARNING: Loss of electrical and functional safety
– To achieve the specified safety integrity level, please refer to Section “Measures re-
quired to achieve a specific safety integrity level” on page 57.
– Please note that in order to achieve the specified PL, the actuator must have a medi-
um level of diagnostic coverage (90% to 99%) and medium MTTFd. A high level of
diagnostic coverage (> 99%) is recommended for the application according to PL d.
– To achieve Cat. 3 and PL d, the test pulses must be enabled.
– Use actuators that can achieve the required safety integrity.
– Evaluate the readback contacts to achieve the corresponding safety integrity level.