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CHAPTER4 ASSIGNMENT OF BASE UNIT AND I/O NUMBER
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4.1 Base Unit Assignment
4.1.2 Base unit assignment
setting
(b) Setting the number of slots smaller than the actual one
Set the smaller number than the actual number of slots when slots with no module mounted need not be
recognized.
For example, four slots from the right end of the base unit will be the prohibited slots when using a 12-slot base
unit and setting the number of available slots to eight. (Mounting a module on a prohibited slot causes
"SP.UNIT LAY ERR.".)
4.1.2 Base unit assignment setting
Set base units on the I/O assignment tab of the PLC parameter dialog box.
(1) Auto/Detail
Select the mode for the base unit assignment either from auto mode or detail mode.
(2) Base model name
Enter the model names of mounted base units within 16 characters.
CPU modules do not use the entered model names. (Use the entered model names for user reference or when
printing out parameters.)
Figure 4.2 Setting the number of slots smaller than the actual one
Figure 4.3 I/O assignment setting
CPU
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Q312B
Main base unit
Power supply
module
CPU module
Number of slots set
Mounting a module will result in an error.
Slot number
Actual number of slots
Prohibited
Prohibited
Prohibited
Prohibited
(2)
(3)
(4) (5)
(1)
(6)
