Mitsubishi Electric MELSEC Q Series Handbook page 26

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INTRODUCTION
(4) Replacing the CPU module with the QCPU, and replacing existing modules with the Q
series modules in series with utilizing the existing A/AnS series module
Method: Replace the modules gradually by using the QA(1S) extension base unit (QA1S51B,
QA(1S)6B) and utilizing the property of AnS/QnAS series.
Advantage: The cost and workload for the transition can be divided, and yet the function extension can
be continued during the transition.
Existing modules
Main base unit AnS series
AnS series
modules
Extension
Remove the existing
base unit
modules and mount them
(1st level)
on the QA1S extension base unit.
AnS series
modules
Remove the existing
modules and mount them
on the QA(1S) extension base unit.
(a) The QA(1S) extension base unit has the "QA6B", supporting A series, and "QA1S51B" and
"QA1S6B", supporting AnS series.
When replacing the A/QnA series, the AnS series module can be utilized.
The QA1S51B is not extendable. Since the QA1S51B does not have an extension cable connector
(OUT), it cannot be used with the QA6  B or QA6ADP+A5  B/A6  B.
(b) When utilizing existing A/AnS series module, programs can be utilized without changing the
existing I/O address with I/O assignment setting in PLC parameter.
For details of I/O address setting method with I/O assignment, refer to Section 5.4.6.
Point
The QA(1S) extension base unit can be used with a Universal model QCPU (The serial number (first
five digits) must be "13102" or later.).
For details and precautions of the QA(1S) extension base unit, refer to Section 5.4.
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Replacement step 1
Q series
Extension
base unit
(1st level)
AnS series
modules
Extension QA1S extension
base unit base unit
(2nd level)
AnS series
modules
QA(1S) extension
base unit
Replacement step 2
Q series
Q series
Q series