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4.2.1 Concept of I/O number assignment
The CPU module assigns I/O numbers at power on or reset, according to the I/O assignment setting.
(1) I/O number assignment
The Figure 4.5 shows an example of I/O number assignment to base units in the system where the CPU module
is mounted on the main base unit.
(a) Assignment order
For the main base unit, the I/O numbers are assigned to the modules from left to right in a
sequential order, starting from 0
For extension base units, the I/O numbers are continued from the last number of the I/O number of
the main base unit.
(b) I/O number of each slot
Each slot on the base unit occupies I/O numbers by the number of I/O points of the mounted
modules.
4 - 5
Q35B (5 slots occupied)
CPU
0
1
Assignment order
Number of slot points
16 points 16 points 16 points 16 points 16 points
Q65B (5 slots occupied)
5
6
Assignment order
Number of slot points
16 points 16 points 16 points 16 points 16 points
Q68B (8 slots occupied)
10
11
Assignment order
Number of slot points
16 points 16 points 16 points 16 points 16 points 16 points 16 points 16 points
Figure 4.5 I/O number assignment example
assigned to the module on the right of the CPU module.
H
Slot number
2
3
4
I/O number: assign the I/O points of each slot
I/O number assignment order
Number of I/O points
7
8
9
12
13
14
15
16
17
X
0 to
F : Inupt module
Y
0 to
F :Output module
0 to
F :Intelligent function module
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