Intrinsically Safe I/O

The DeltaV system includes the following Intrinsically Safe I/O components:

WARNING!

Be sure that your I.S. I/O cards and terminal blocks are compatible before plugging in I/O cards. Card damage can result if an I/O card and terminal block are incompatible.

WARNING!

In any hazardous area installation it is important to read and follow the device manufacturer's design and installation documents. Failure to follow the documentation could result in an unapproved and unsafe application. Additionally, in hazardous locations follow your plant's procedures for making the area safe during installation and maintenance operations.

You can use both I.S. and non-I.S. I/O cards within one DeltaV system. However, you must separate the I.S. cards from the non-I.S. cards with a LocalBus Isolator to protect the I.S. cards from damaging voltages. Only one LocalBus Isolator can be used in the DeltaV system. Plan your I/O subsystem carefully because you cannot add non-I.S. cards beyond the LocalBus Isolator. If you use multiple I.S. system power supplies, intersperse the power supplies among the cards. Refer to DeltaV™ Scalable Process System with Zone 0 Field Circuits Installation Instructions (Part Number - 12P1990) for detailed information on wiring multiple I.S. system power supplies. This manual is on the DeltaV Documentation Library DVD. The following figure shows a LocalBus Isolator separating non-I.S. and I.S. cards.
Figure: DeltaV Intrinsically Safe I/O Overview


Important

Field power is provided by the I.S. I/O cards. Do not connect to the connectors on the top of the I.S. 8-wide carrier.

The following figure shows the grounding requirements for an I.S. I/O subsystem.
Figure: Grounding Requirements for I.S. I/O


Several documents pertaining to Hazardous Area installations are on the DeltaV Documentation Library DVD.

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