ABB System 800xA Operations page 11

Section 1 Safety Operator Warnings
Safety Lifecycle Activities
Requirements in the application specific standards listed in the chapter Applicable
Specifications and other relevant and valid application standards shall be adhered to
(e.g. EN 54, EN 298, EN 1037 and EN ISO 13850).
Process Interface Selection
For safety critical functions, only certified I/O modules shall be used. If non-
certified I/O modules are connected to a SIL2 Application, a warning is given, but
download of the Application is allowed upon engineer's approval. For SIL3
applications, download is prevented.
The HART functionality of AI880A is approved to be interference free, for non
safety critical use.
The use of HART routing of AI880A during operation of the plant, shall be
restricted by configuration or by operational procedures.
AI880A as DI - Loop Supervised Digital Input Module
If the AI880A as DI - Loop Supervised Digital Input Module is used with an
external field loop resistor network, this resistor network shall be configured in
accordance with the guidance in the user manual "S800 I/O - Modules and
Termination Units, 3BSE020924*.
DI880 High Integrity Digital Input Module
The sequence of event functionality of DI880 is certified interference free, for non-
safety critical use.
If an input loop of DI880 is externally powered, the loop shall be equipped with a
current limiting device in the signal line. The current shall be limited to 200 mA.
DO880 High Integrity Digital Output Module
Normally De-energized DO880 channels can only be used in High Demand
applications provided the demand rate of the process exceed 10 minutes.
2PAA110888-600 - Warnings based on 3BNP004865-600 RevA
Warnings
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