Installing Extension Base Units And Setting The Number Of Stages - Mitsubishi Electric MELSEC-Q Series User Manual

5 ASSIGNMENT OF I/O NUMBERS

5.2 Installing Extension Base Units and Setting the Number of Stages

Setting of extension
stage
Stage setting
connector
5 - 3
As extension base units, you can use the Q5 B and Q6 B that are designed for
installation of Q series-compatible modules.
The QA1S6 B and QA65B extension base units are unusable.
(1) Setting order of the extension stage numbers for extension base
units
Extension base units require the setting of the extension stage numbers using
the stage setting connector.
Assign the extension stage numbers starting from 1 to 2/4 to the extension base
units counting from the one which is connected to the main base unit.
(2) Cautions to assign extension stage numbers to extension base
units
(a) Assign consecutive numbers to extension stages.
If you assign stage numbers to base units in "Auto" mode and assign some
stage numbers to no modules, "0" is assigned to the skipped stage as the
number of slots. Consequently, the number of vacant slots does not
increase. The I/O assignment also assigns "0" to the skipped stage as the
I/O points.
(b) It is impossible to set and use the same extension stage number with two or
more extension base units.
(c) You cannot use the system if two or more connector pins are inserted to the
stage setting connector.
On the contrary, you cannot use the system if no connector pin is inserted
to the stage setting connector.
8 9 10 11 12 13 14 15
1
16 17 18 19 20 21 22 23
2
0 1 2 3 4 5 6 7
Q38B
Q68B
Q68B
MELSEC-Q
Main base unit
5 - 3