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4 Remote I/O Master Communications
4-3
Fixed Allocations
4-3-1
Allocated Words
If fixed allocation is used, allocated words are in the following I/O (CIO) area in the memory used for CJ-
series Unit. You can select an area of words from one of three fixed allocation areas. Use
*_Sw1MstrFixAloc1Cmd to *_Sw1MstrFixAloc3Cmd (Master Fixed Allocation Setting 1 to 3 Switch) to
select the allocation area.
Each area is comprised of an OUT area that is used to write output data to slaves and an IN area that is
used for input from slaves in remote I/O communications.
To access a slave allocated to the fixed allocations areas 1 to 3 from the user program, user-defined
variables that specify the AT specification of the memory used for CJ-series Unit to which the slave is
allocated need to be defined.
Area
Fixed allocation area 1
CIO 3200 to CIO 3263
Fixed allocation area 2
CIO 3400 to CIO 3463
Fixed allocation area 3
CIO 3600 to CIO 3663
You can include a maximum of 3 DeviceNet Units as masters in a single CPU Unit because the three
allocation areas above on the memory used for CJ-series Unit are set individually for fixed allocations.
The default setting is fixed allocations area 1.
Each OUT/IN area is allocated to a slave according to its node address as shown below. Allocated
words are determined by the node address in fixed allocations as shown.
Area 3
Area 2
I C
O
3
6
0
0
I C
O
3
4
0
0
I C
O
3
6
0
1
I C
O
3
4
0
1
I C
O
3
6
0
2
I C
O
3
4
0
2
I C
O
3
6
6
1
I C
O
3
4
6
1
I C
O
3
6
6
2
I C
O
3
4
6
2
I C
O
3
6
6
3
I C
O
3
4
6
3
Note You can include more than one Master Unit in a single CPU Unit with fixed allocations, as shown
below (3 Units max.).
Master Unit
Master Unit
4-14
OUT area (word)
CIO 3300 to CIO 3363
CIO 3500 to CIO 3563
CIO 3700 to CIO 3763
Area 1
OUT area
I C
O
3
2
0
0
I C
O
3
2
0
1
I C
O
3
2
0
2
I C
O
3
2
6
1
I C
O
3
2
6
2
I C
O
3
2
6
3
Slave
Slave
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
IN area (word)
Change *_Sw1MstrFixAloc1Cmd (Master
Fixed Allocation Setting 1 Switch) to TRUE.
Change *_Sw1MstrFixAloc2Cmd (Master
Fixed Allocation Setting 2 Switch) to TRUE.
Change *_Sw1MstrFixAloc2Cmd (Master
Fixed Allocation Setting 3 Switch) to TRUE.
Node
address
Area 1
IN area
I C
I C
I C
I C
I C
I C
Selection method
Area 2
Area 3
O
3
3
0
0
I C
O
3
5
0
0
I C
O
3
O
3
3
0
1
I C
O
3
5
0
1
I C
O
3
O
3
3
0
2
I C
O
3
5
0
2
I C
O
3
O
3
3
6
1
I C
O
3
5
6
1
I C
O
3
O
3
3
6
2
I C
O
3
5
6
2
I C
O
3
O
3
3
6
3
I C
O
3
5
6
3
I C
O
3
7
0
0
7
0
1
7
0
2
7
6
1
7
6
2
7
6
3
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