INSTALLATION
3-13
Hardware
and Installation User Manual
3.4.3 Setting
Highest I/O Base Number — TI535 Models
The base assembly holding the PLC also holds the local I/O. The local I/O
consists
of the first two logical bases, numbered 0 and 1. A logical base is defined
as a group of eight I/O slots. As many as fourteen additional logical bases,
numbered
from 2 to 15, may be connected to the system as distributed I/O.
Switches 5–8 on DIP 1 are used to select the highest-numbered logical base in
the
system. For example, if your system consists of 5 logical bases numbered 0
through 5, then the dipswitches should be set for 5.
Switches
5–8 reduce I/O update time by preventing the PLC from attempting to
communicate with distributed bases that are not present or which you may
have
shut down. Although it increases scan time, you can set the switches for 15
if
you prefer
, regardless of the actual number of logical bases that are connected.
Y
ou may connect Series 500 bases to your system. Number the Series 500 logical
bases just as you would Series 505 bases; however, the total number of logical
bases
cannot exceed 16.
Figure 3-10 lists the switch positions for each address.
base
address
5678
0ONONONON
1 OFF ON ON ON
2 ON OFF ON ON
3 OFF OFF ON ON
4 ON ON OFF ON
5 OFF ON OFF ON
6 ON OFF OFF ON
7 OFF OFF OFF ON
8 ON ON ON OFF
9 OFF ON ON OFF
10 ON OFF ON OFF
11 OFF OFF ON OFF
12 ON ON OFF OFF
13 OFF ON OFF OFF
14 ON OFF OFF OFF
15 OFF OFF OFF OFF
.
Switch position
Highest
DIP
1
Position not
selected
Position
selected
Push
down
ONOFF
Figure 3-10 Switch Settings — TI535 Highest-Numbered
Logical Base
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