
6
Basic specifications
Device diagnostics and behavior of the module in the event of an error
Actuator
Single-channel
Achievable SIL/Cat.
SIL 2/Cat. 2/PL c
To achieve the specified category, please refer to Section "Measures required to achieve
a specific safety integrity level" on page 6-3.
Table 6-11
Safety-related segment circuit: Assignment with single-channel actuators
Error type
Detection Diagnostics Loss of
SF
Remark
Error in the actuator
Despite the safe segment output
being disabled, the switching
element of the single-channel
actuator does not switch to the safe
state (e.g., a contact will not open)
No
None
Yes
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Test the shutdown capability of the actuator at regular
intervals, at least once every six months.
Actuator cannot be enabled
(e.g., interrupt)
No
None
No
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Ensure that this error does not result in delayed system
startup.
Other errors
(depending on the actuator)
Please take into consideration all possible errors that can
occur in the actuator.
Error in the wiring
Interrupt
Cable interrupt between output and
actuator or between actuator and
ground
No
None
No
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Ensure that this error does not result in delayed system
startup.
Cross circuit
Output to output (only safety-
related segment circuit outputs)
No
None
No
A cross circuit between the outputs cannot be detected. This is
not critical since in the event of a safety demand, all actuators
connected to the safety-related segment circuit are switched off.
Safety-related segment circuit
output to output that is not part of
the safety-related segment circuit
No
None
Yes
The error is not detected.
Observe the versions in the document for the safety-related
segment circuit in the VersaPoint system (see "Ordering data:
Documentation" on page 11-9).
Short circuit
Output to ground
or
output to FE
Yes
None
No
The error is not detected.
To protect the relay output against overload, observe the notes
on protecting the relay outputs in
WARNING: The voltage in the safety-
related segment circuit cannot be
disconnected
It is no longer possible to disconnect the voltage to
the safety-related segment circuit. All safety
functions that were implemented via the safety-
related segment circuit are lost. Therefore prevent
cross circuits/short circuits with external signals
6-20
User manual IC220SDL840 -
May 2018
GFK-2734
Содержание VersaSafe VersaPoint IC220SDL840
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