Mitsubishi Electric Q26UD(E)HCPU User Manual page 46

(6) Precautions for the number of mountable modules
Mount modules so that the total number of I/O points does not exceed the point range of the CPU module.
Modules can be mounted in any slot within the available range.
Even if the total number of slots of the main base unit and extension base units exceeds the number of available
slots (for example, even if six12-slot base units are used), no error occurs as long as modules are mounted within
the available range.
If a module is mounted exceeding the available range, "SP.UNIT LAY ERR." (error code: 2124) occurs.
Main base unit
Q312B
Power supply
module
Extension base unit
Q612B
Q612B
Q612B
Q612B
Q612B
44
CPU 0 1 2 3 4 5
CPU module
12 13 14 15 16 17 18 19 20
24 25 26 27 28 29 30 31 32
36 37 38 39 40 41 42 43 44
48 49 50 51 52 53 54 55 56
60 61 62 63
Modules can be Modules cannot be installed.
installed. (Installing modules will result in error.)
6 7 8 9 10 11
Slot number
Extension 1
21 22 23
33 34 35 Extension 2
45 46 47 Extension 3
Extension 4
57 58 59
When the GOT has been bus-
connected, one slot of extension
base 1 is used.
Also one GOT occupies 16 I/O
points.
When using the GOT, consider
Extension 5
the number of slots and the
number of I/O points.
Refer to the GOT Manual for
details of busconnecting the GOT.