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FP2/FP2SH
3.4
Automatic Allocation
3.4.1
Using Automatic Allocation
After turning on the power, I/O numbers are determined by the I/O unit installation posi-
tions and assigned in order beginning from the left side of the CPU backplane.
If an expansion backplane has been added on the FP2 backplane, the number of slots
for I/O units on the CPU backplane is taken as 16 slots. (The FP2 backplane H type
occupies 8 slots only.)
For a slot with no unit mounted, an equivalent of 16 points (16E) is allocated.
In the case of automatic allocation, I/O numbers are assigned based on the installed
I/O units each time the power is turned on.
Note
With automatic allocation, the contents of allocation are not reg-
istered to the system register.
3.4.1.1
Example of Automatic Allocation
The I/O numbers in the illustration are the allocated I/O numbers using automatic alloca-
tion.
CPU backplane
Backplane: 7-module type
Power supply unit: 1 module
CPU: 1 module
I/O units:
16-point type DC input unit: 2 units
16-point type transistor output unit: 3 units
Expansion backplane
Backplane: 9-module type
Power supply unit: 1 module
I/O units:
16-point type relay output unit: 6 units
64-point type DC input unit: 1 unit
CPU
Slot No.
backplane
X0
X10
Y20
to
to
to
XF
X1F
Y2F
Expansion
16-point type
backplane
DC input unit
Y160
Y170
Y180
Y190
to
to
to
to
Y16F
Y17F
Y18F
Y19F
16-point type
relay output unit
I/O Allocation
3.4
Automatic Allocation
Slots that do not actually exist
Y30
Y40
50
60
150
to
to
to
to
to
Y3F
Y4F
5F
6F
15F
16-point type
transistor output unit
Y200
Y210
X220
260
to
to
to
to
Y20F
Y21F
X25F
26F
64-point
Free
type DC
slot
input unit
3 − 15
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