INSTALLATION
3-20
Hardware
and Installation User Manual
I/O
modules are grouped into local or distributed I/O categories depending upon
their physical location. The local I/O comprises those modules installed in the
same
base assembly as the PLC — the primary base.
A system having local I/O only consists of a single base assembly comprising a
maximum of two logical bases. A 16-slot base assembly contains two logical
bases,
numbered 0 and 1 from left to right. The 8-slot and 4-slot base assemblies
each
contain one logical base, numbered 0. See Figure 3-16.
Bases 0 and 1 are always on the local base. Therefore, any
distributed
base will always be numbered greater than 1.
If
your system has local I/O only
, you need to install the power supply
, PLC
and
I/O modules in a single base assembly. See the installation instructions later in
this
chapter
.
Power
4-Slot base
supply
8-Slot base
16-Slot base
Series 505
Logical
base 0
Logical
base 1
I/O modules
TI525/TI535
PLC
Figure 3-16 System With Local I/O Only
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