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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.
You 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.
Position
selected
Push down
Figure 3-10 Switch Settings — TI535 Highest-Numbered
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INSTALLATION
OFF
ON
DIP 1
Position not
selected
Logical Base
3-13
Switch position
Highest
base
5
6
7
8
address
0
ON
ON
ON
ON
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
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