Mitsubishi Electric MELSEC Q Series Handbook page 29

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INTRODUCTION
(5) Replacing only main base unit with the Q series, and replacing the extension base unit
with the Q series modules in series with utilizing the existing A/AnS series module
Method: Replace the CPU module and all modules mounted on the main base unit with the Q
series. Replace the extension base unit gradually by using the Q-AnS conversion adaptor
(QA1S6ADP(-S1)) 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
A1S3 B
AnS series
modules
A1S6 B
AnS series
modules
(a) If the existing extension base unit is the A1S6  B-S1 or A1S5  B-S1, use the QA1S6ADP-S1.
The QA1S6ADP-S1 can be connected in any of the first, second, or third extension stages
according to the existing system configuration.
Note that the QA1A6ADP can be connected to the base unit in the first extension stage only.
Even though the existing configuration has two extension stages or more, stage number is not
selectable.
In addition, since the QA1A6ADP does not have an extension cable connector (OUT), it cannot
be connected to the base unit in the second extension stage or higher. Consequently, a system,
when the QA1S6ADP is used, is configured with two base units (a Q series main base unit and
an AnS extension base unit equipped with QA1S6ADP).
(b) When the existing A/AnS Series modules are used, the program can be used without changing
the existing I/O addresses through I/O assignment by parameters. For the detailed procedures
for setting the I/O addresses through I/O assignment, refer to Section 5.4.6 (2).
Q3 B
Replacement of modules
on the main base unit with
Q series modules
A1S6 B
Mounting of the QA1S6ADP
on the extension base unit
Replacement
step 1
Q series
modules
AnS series
modules
Replacement of modules
on the main base unit with
Q series modules
QA1S6ADP-(S1)
Replacement
step 2
Q series
modules
Q series
modules
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