ABB S800 I/O User Manual page 29

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ELCON Instruments provides a HART protocol connection to I/O modules
integrated with the Intrinsic Safety System, see
For further information refer to
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3BSE 020 923R101
S800 I/O
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Figure
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Intrinsic Safety System
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1-11.
and
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HART Multiplexer Connection
To PC
RS485
19