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CHAPTER4 ASSIGNMENT OF BASE UNIT AND I/O NUMBER
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4.1 Base Unit Assignment
4.1.1 Base mode
CHAPTER4 ASSIGNMENT OF BASE UNIT AND I/O
NUMBER
This chapter describes the base unit and I/O number assignment required for the CPU module to communicate data
with I/O modules and/or intelligent function modules.
4.1 Base Unit Assignment
4.1.1 Base mode
Use this mode when assigning the number of available slots to the main base unit and extension base units.
The following two modes are available.
• Auto mode
• Detail mode
(1) Auto mode
Use this mode when assigning the number of slots equal to that on the base unit used.
(2) Detail mode
Use the detail mode when assigning the number of slots for each base unit.
Any number of slots can be assigned irrespective of the actual number of slots on the base unit to be used.
(a) Setting the number of slots greater than the actual one
Slots are occupied by the number of slots set.
The slots after actually used ones are regarded as empty slots.
For example, three slots will be the empty slots when a 5-slot base unit is used and the number of available
slots are set to eight.
The number of points for the empty slots will be either value set on the PLC system tab, or on the I/O
assignment tab in the PLC parameter dialog box. (The default is 16 points.)
Figure 4.1 Setting the number of slots greater than the actual one
Number of slots set
CPU module
Q35B
Main base unit
Power supply
module
Actual number of slots
Slot number
CPU 0 1 2 3 4 5 6 7
Empty
Empty
Empty
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