The Emerson PAC80002/2 I/O Module Carriers are designed for either 32 or 64 module
addressing. If 64-slot addressing is required for a node, these carrier types must be used exclusively as
they cannot be mixed with 32-slot address carriers. A range of extender carriers and cables allow for
flexibility in cabinet design. Carriers can be mounted on T- or G-section DIN-rail or directly to a flat
surface, and may be joined end-to-end to extend the size of an installation.
Bussed Field Power (BFP) is connected to the I/O Module Carrier for modules that require this. Each BFP
connection supplies two adjacent module slots, so these modules must use the same BFP supply. Terminals
are provided on the Carrier to terminate cable screens and shields. Field terminals are "clicked" in to
place on the Carrier, then are trapped in place by inserting the I/O Module and secured by the module's
screw. I/O Module Carriers have no active components, so have very high reliability.
The PAC8000 2/1 I/O Module Carriers are designed for 2/1 modules with Intrinsically Safe field wiring and
are for either 32- or 64-module addressing. If 64-slot addressing is required for a node, these carrier
types must be used exclusively as they cannot be mixed with 32-slot address carriers. A range of extender
carriers and cables allow for flexibility in cabinet design. Carriers can be mounted on T- or G-section
DIN-rail or directly to a flat surface, and may be joined end-to-end to extend the size of an installation.
Terminals are provided on the Carrier to terminate cable shields and screens.
Field terminals are "clicked" in to place on the Carrier, then are trapped in place by inserting the I/O Module
and secured in place by the module's screw. I/O Module Carriers have no active components, so have very high
reliability. 2/1 modules do not employ Bussed Field Power as the 2/2 modules do. They draw all their field
power requirements from the System Power supply. The current drawn from the System Power Supply is typically
much higher on the 2/1 side of the node than on the 2/2 side. System Power from the 2/2 side of the node does
not pass through the Railbus Isolator, but is provided by one or more 8920-PS-DC IS Power Supplies mounted on
the 2/1 side of the Railbus Isolator.
