Safety-Related Segment Circuit - GE VersaSafe VersaPoint IC220SDL840 User Manual

6
Actuator
Achievable SIL/Cat.
Table 6-11 Safety-related segment circuit: Assignment with single-channel actuators
Error type
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)
Actuator cannot be enabled
(e.g., interrupt)
Other errors
(depending on the actuator)
Error in the wiring
Interrupt
Cable interrupt between output and
actuator or between actuator and
ground
Cross circuit
Output to output (only safety-
related segment circuit outputs)

Safety-related segment circuit

output to output that is not part of
the safety-related segment circuit
Short circuit
Output to ground
or
output to FE
6-20
Basic specifications
Single-channel
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.
Device diagnostics and behavior of the module in the event of an error
Detection Diagnostics Loss of
No None
No None
No None
No None
No None
Yes None
User manual IC220SDL840 - May 2018
Remark
SF
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.
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.
Please take into consideration all possible errors that can
occur in the actuator.
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.
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.
Yes The error is not detected.
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
Observe the versions in the document for the safety-related
segment circuit in the VersaPoint system (see "Ordering data:
Documentation" on page 11-9).
No The error is not detected.
To protect the relay output against overload, observe the notes
on protecting the relay outputs in
.
page 2-4
Section "Fuse protection" on
GFK-2734