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4.4 Base Unit Assignment (Base Mode)
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I/O NUMBER ASSIGNMENT
(2) Detail mode
In Detail mode, set the number of mountable modules to each base unit in the I/O
assignment setting of the PLC parameter dialog box.
(a) Applications
This mode can be used when matching the number of mountable modules with
the number of modules (fixed to 8 slots) occupied by the AnS/A series base unit,
for example.
This mode is also used to make the slots after an empty one unrecognized since
an empty slot occupies 1 slot even if it is set to 0 points in the I/O assignment.
(b) Cautions on setting the number of slots
The number of slots can be set regardless of the number of the module being
used.
POINT
Set the number of slots for all used base units.
If the number of slot is not set for all the base units, I/O assignment may not work
correctly.
The followings result if the preset number of slots differs from that of the installed
base units.
1) When the preset number of slots is greater than the number of actually
used slots
The preset number of slots is occupied.
The slots of numbers after the used ones are assigned as empty slots.
For example, when 8 slots are designated for a 5-slot base unit, 3 slots will be
empty slots.
The number of points for the empty slots is the one designated at the "I/O
assignment" tab screen in the "(PLC) Parameter" dialog box. (Default value is
16 points.)
Figure 4.13 When the preset number of slots is greater than the number of actually used
slots
Power supply
CPU module
Main base unit
Slot number
Empty
Empty
Empty
CPU
0
1
2
3
4
5
6
7
Q35B
Three slots are occupied.
