Installation guide

Installation
28
890USE17100 September 2003
The Layout of Modules on an Island Bus
Making a Plan Before you begin to install the modules, you need to establish a solid plan that
identifies:
The number and type of I/O modules on your island
Their power requirements
The order in which they will be placed on the island bus
Base unit needs
A keying scheme that helps match the correct modules with their bases
A Labelling plan
Establishing and following a clear plan is necessary. The island bus will be
constructed with a series of interconnected base units, and these base units are
module-specific. The structure of the island backplane, therefore, will be defined by
the type and order of modules that will reside in it. You will need to make these
decisions in advance so that you can build the correct backplane, and key your base
to module connections. Although there is inherent keying in the Advantys I/O
system, optional keying of modules and connectors is available and recommended
(See Keying Considerations, p. 42). Careful marking of your island base to module
combinations is also recommended (See Labeling the Bases and the Modules,
p. 32).
Selecting I/O
Modules
When you plan an island layout, the most important things you need to know are the
number and type of I/O modules and their matching bases. Once these two issues
have been determined, it becomes easy to determine your external power
requirements, power distribution requirements and the overall hardware design.
Up to 32 I/O modules can be supported on an island bus. These modules can be
any combination of digital, relay, analog, and special-purpose Advantys STB
modules and preferred modules. As many as 12 of these modules may be standard
CANopen devices—if you use standard CANopen devices, they must be installed at
the end of the island bus.
Note: If you mix AC and DC voltage groups in a single segment we recommend
that the AC group be installed to the left of the DC group.