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UDD406A 3BHE041465P201 ABB Main unit of field controller
UDD406A 3BHE041465P201 ABB Main unit of field controller
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This section contains a brief overview of the main characteristics and intended use
of the AC 800M HI.
The AC 800M HI is certified to comply with the requirements of Safety Integrity
Level 1 - 3 according to IEC 61508.
Additionally, a set of other relevant safety/application standards are supported by
the AC 800M HI, see Applicable Specifications on page 35.
When configured as a SIL1-2 systems, the AC 800M HI is realized in a 1oo1D
structure by combining application execution in the PM865 with diagnostic and
monitoring functions of the SM810/SM811.
When configured as a SIL3 systems, the AC 800M HI is realized in a 1oo2D1
structure by executing application in both PM865 and SM811 (SM810 can not be
used in SIL3 systems).
The SM810 can be used in systems containing applications classified up to SIL2,
while the SM811 can be used for both SIL1-2 and SIL3 applications.
The S800 I/O High Integrity modules (AI880A, AI880A as DI, DI880 and DO880)
are certified for use in SIL1-3 safety functions as single modules2
. This is achieved
by using an internal diverse redundant structure with diverse execution and mutual
supervision.
The AC 800M HI offers a certified control environment that can host a combination
of non-SIL classified BPCS functions and SIL1-3 classified safety functions in the
same controller. In order to enable this, a SIL classification of user applications is
introduced.
All functions/types in standard libraries usable in SIL classified applications are
marked SIL2, SIL2 Restricted, SIL3 or SIL3 Restricted.
Communication modules and protocols that are not certified for safety critical use as
well as non certified I/O modules, are possible to use in SIL classified applications
for non safety critical functions, e.g. process feedback, status indications, etc.
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