5 - 1 5 - 1
MELSEC-Q
5 ASSIGNMENT OF I/O NUMBERS
5
5 ASSIGNMENT OF I/O NUMBERS
This section describes the necessary information on the I/O number assignment for the
data exchange between High Performance model QCPU and I/O modules or intelligent
function modules.
5.1 Relationship Between the Number of Stages and Slots of the Extension Base Unit
High Performance model QCPU allows the system configuration using eight base
units: one main base unit and seven extension base units.
However, the number of available slots (modules) is limited to 64 slots including empty
slots.
An error (SP. UNIT LAY ERR.) occurs when a module (input, output, or intelligent
function module) is installed to the 65th or subsequent slots.
Be sure to install modules within the range of 64 slots. (An error does not occur as
long as all modules are installed within the range of 64 slots, even if the total number of
slots of the main and extension base units results in 65 slots or more [e.g. When 6 12-
slot base units are installed].)
60 61 62 63
48 49 50 51 52 53 54 55 56 57 58 59
24 25 26 27 28 29 30 31 32 33 34 35
Setting of extension
stage
(See Section 5.2.)
01234567891011
Slot No.
Power supply
Q312B
12 13 14 15 16 17 18 19 20 21 22 23
Q612B
Q612B
Q612B
Q612B
Q612B
1
2
3
4
5
36 37 38 39 40 41 42 43 44 45 46 47
Mountable module . Unmountable module .
(Mounting module will result in error.
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