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Omni8/16C/Omni8P User Manual
UMC1480R24.pdf
71
© Omniflex 2021
Hardware fault tolerance is 0.
Omni16C is a Type B subsystem.
Changing configuration:
Hardware configuration is performed by means of DIP switches:
on Input cards for input type
on CPU card for alarm sequence configuration
Input DIP switches in SIL1 applications must be closed.
Alarm sequence options can be selected as described elsewhere in this User Manual.
Configuration can also be changed through the Programming port (“soft-set mode”). Programming port
should not be used other then for initial or periodic setup of unit configuration.
7.3
Installation Requirements
To maintain the specified performance of Omni16C products, the units must be used within specified
limits of safety, environmental and EMC parameters.
Installation, configuration and operation must only be carried out by suitably trained personnel.
Maintenance and repairs can only be performed by Omniflex personnel.
Units must be installed in panels in such a way that access to configuration switches and connections
at the back is not possible in normal operation, thus preventing unauthorized configuration changes.
7.4
Functional Safety Parameters
This paragraph describes functional safety parameters of Omni16C family unit in configuration described.
All units use embedded firmware revision 8.02, which was subjected to SIL1 assessment through
EMPHASIS.
Failure of the unit is defined as the failure to illuminate the window and activate General Alarm (GA) relay
when input contacts in the field are opened (failure to respond to alarm).
Safe failure is defined as any failure which does not impact on the function described above.
Dangerous failure is defined as any hardware failure, which results in a unit not accepting and displaying
an alarm (remains in NORMAL state of alarm and watchdog).
Any of the failures are defined as detected when the operator is alerted to abnormal operation, when
diagnostic output is opened, or the unit indicates alarm on any output (visual, audible or logic) without
input being activated.
Safety parameters are summarised in Table 7-2 below.