Omni8/16C/Omni8P User Manual
UMC1480R24.pdf
74
© Omniflex 2021
7.7
Prevention of Systematic Failures
It is crucial to prevent systematic failures so that performance of the unit with respect to general random
failures is not affected. As this is a stand-alone unit, systematic failures are generally attributed to
incorrect connection or configuration.
In this context, the following points must be observed:
Omni16C inputs must be configured for positive common and closed contacts. Open contacts
represent alarm condition.
24V DC supply voltage for the Omni16C and the DC supply voltage for field contacts must have the
same ground potential.
Common Services inputs (Silence, Ack, etc.) must be wired to normally-open contacts which close to
ground (COM on Omni16C terminals) when activated by an operator.
Check that sequence selected is suitable and correct for the type of alarm being monitored.
The watchdog output should be used for maximum Diagnostic Coverage. Although PFD and SFF
without the watchdog meet SIL1 requirements, the figures quoted in Table 7-2 assume the use of the
watchdog function.
Software revision 8.02 should be used.
The unit should be used within the range of ambient temperatures and humidity as specified in the
datasheet.
Vibration can be up to 1g in the range 10-250Hz
EMC – Omni16C must be operated so that interference levels stated in Specifications are not
exceeded.
The Operator should perform the full Circuit Test at intervals of 8 hours (start of shift). Indicated Faults
must be attended to immediately.
