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6-5
6 I/O Allocation
CP2E CPU Unit Software User’s Manual(W614)
6-1
Allocat
ion
of
Inp
u
t B
its an
d Out
p
u
t Bit
s
6
6-1-4 Allocations to Expa
nsi
on Units and Expansion I/O Units
z
I/O Bits Allocation with Expansion I/O Units Connected
Allocation Example: Expansion I/O Unit with 40 I/O Points (CP1W-40ED )
Twenty-four input bits in two words are allocated (bits 00 to 11 in CIO m and bits 00 to 11 CIO m+1).
Sixteen output bits in two words are allocated in two words (bits 00 to 07 in CIO n and bits 00 to 07
in CIO n+1).
Two input words (24 bits) and two output words (16 bits) are allocated to a 40-point I/O Unit.
Allocation Example: Expansion Input Units and Expansion Output Units
If Expansion Input Units or Expansion Output Units are connected, the input or output word not used
by an Expansion I/O Unit is allocated to the next Unit that requires it.
15 14 13 11 12 09 08 07 06 05 04 02 01 00
Cannot b e u sed
03 10
Inp u t b its
O u tp u t b its
CIO m
CIO m+1
CIO n
CIO n+1
b it
Cannot b e u sed
CPU Unit w ith 30 I/O Points
Inp u t b its
O u tp u t b its
CIO 0.00 to CIO 0.11
CIO 1.00 to CIO 1.05
18 inp u ts
12 o u tp u ts
CIO 100.00 to CIO 100.07
CIO 101.00 to CIO 101.03
1st Unit:
8-point Expansion
Inp
u t Unit
CIO 2.00 to CIO 2.07
8 inp u ts
N o o u tp u ts
2nd Unit:
16-point Expansion
O
u tp u t Unit
N o inp u ts
16 o u tp u ts
CIO 102.00 to CIO 102.07
CIO 103.00 to CIO 103.07
3rd Unit:
20-point Expansion
I/O Unit
CIO 3.00 to CIO 3.11
12 inp u ts
8 o u tp u ts
CIO 104.00 to CIO 104.07
b it
15 14 13 11 12 09 08 07 06 05 04 02 01 00 03 10
Inp u t b its
O u tp u t b its
CIO 0
CIO 1
CIO 2
CIO 3
CIO 100
CIO 101
CIO 102
CIO 103
CIO 104
Cannot b e u sed
Cannot b e u sed
CPU Unit w ith 30 I/O Points
CPU Unit w ith
30 I/O Points
8-point Expansion Inp u t Unit
20-point Expansion I/O Unit
20-point Expansion I/O Unit
16-point Expansion O u tp u t Unit