Design,
2.2
Functions and Operation
Basic System Design - with External
You
can expand the basic system by using
modules (external
These external
consist of functional units that you can combine according to the task you want to perform.
Example of a Subunit with External
Figure 2-2.
Basic Unit with External
Basic Unit
For an
you always require two basic units. These two basic units are the core of the
programmable controller and are connected via a fiber optic cable.
External
If you require more than the available onboard
or if you need special functions, you can
expand your basic system with additional external
The
can be expanded via bus units with
standard and failsafe modules. A
maximum of 8 bus units can be connected to each basic unit.
Bus Units with Terminal Blocks
(crimp snap-in or
Bus units
are used to connect the
modules to the basic unit. One bus unit
accommodate two
modules.
Standard Mounting Rail
The power supply module, the basic unit and the required bus units are mounted on
standard mounting rail.
can
the
2-2
EWA 4NEB 8126210-02
