I/O Address For The Qa(1S) Extension Base Unit - Mitsubishi Electric MELSEC Q Series Handbook

5
REPLACEMENT OF BASE UNIT AND EXTENSION CABLE

5.4.6 I/O address for the QA(1S) extension base unit

This section explains I/O address (I/O assignment) when using the QA(1S) extension base unit.
(1) Concept of I/O address when using the QA(1S) extension base unit
I/O address when using the QA(1S) extension base unit can be assigned to either of the following.
(a) Assign the I/O address of the Q series module to the lowest address and assign that of the A
series module to the Q series module I/O address + 1 or later.
(b) Assign the I/O address of the A series module to the lowest address and assign that of the Q
series module to the A series module I/O address + 1 or later.
Point
(1) I/O address can be assigned by either of the following address orders.
(a) Q series module  A series module
(b) A series module  Q series module
Note that the CPU module does not start due to an error if the address is assigned in the order
of Q series module  A series module  Q series module and vice versa.
(2) The QA(1S) extension base unit (QA1S51B, QA1S65B, QA1S68B, QA65B, QA68B) occupies I/O
addresses for eight modules.
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