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6
Actuator
Achievable
SIL/SIL CL/Cat./PL
External errors that can be
detected
Errors that cannot be
detected
External wiring
requirements
6-10
WARNING: Failure of the safety relay contacts due to overload
Protect all safety relay contacts against overload with suitable fuses (see "Safe digital
relay outputs" on page 11-4).
The illustrated 24 V voltage is not provided by the VersaPoint station.
Key:
A
B
OUT0_Ch1_13
OUT0_Ch1_14
OUT0_Ch2_13
OUT0_Ch2_14
UT1 (UT2)
IN1 (IN2)
K1 (R) and K2 (R) represent the forcibly guided N/C contacts for monitoring the state of the
relay (readback contacts).
To use the function for external contact monitoring, wire the N/C contacts to alarm input
IN1 (IN2) as illustrated. In this case, the alarm input must be assigned to the output.
Parallel connection of the alarm contacts is not permitted.
These contacts can also be read via safe digital inputs. In this case, evaluate the readback
and thus the state of the switching elements in your safe application program.
When calculating the SIL values for both alternatives, take the different failure rates into
consideration.
WARNING: Loss of the safety function due to external supply
Make sure that no cross circuits can occur.
Basic specifications
Two-channel
SIL 3/SIL CL 3/Cat. 4/PL e
If alarm inputs IN1 or IN2 are used:
1.
An external load does not pick up
Note: If one of the two external relays does not pick up, this cannot be detected if the
other relay is operating normally.
2.
An external load does not drop out
If no alarm inputs are used, no errors can be detected in the external load or in the wiring.
The user is responsible for error analysis for the connected loads and for the external
wiring.
User manual IC220SDL840 - May 2018
Alternative A
Alternative B
Output 0, channel 1, contact 13
Output 0, channel 1, contact 14
Output 0, channel 2, contact 13
Output 0, channel 2, contact 14
Clock output UT1 or UT2
Alarm input IN1 or IN2
GFK-2734
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