4 Remote I/O Master Communications
4-14
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4-3 Fixed Allocations
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.
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.
Note You can include more than one Master Unit in a single CPU Unit with fixed allocations, as shown
below (3 Units max.).
4-3-1 Allocated Words
Area OUT area (word) IN area (word) Selection method
Fixed allocation area 1 CIO 3200 to CIO 3263 CIO 3300 to CIO 3363 Change *_Sw1MstrFixAloc1Cmd (Master
Fixed Allocation Setting 1 Switch) to TRUE.
Fixed allocation area 2 CIO 3400 to CIO 3463 CIO 3500 to CIO 3563 Change *_Sw1MstrFixAloc2Cmd (Master
Fixed Allocation Setting 2 Switch) to TRUE.
Fixed allocation area 3 CIO 3600 to CIO 3663 CIO 3700 to CIO 3763 Change *_Sw1MstrFixAloc2Cmd (Master
Fixed Allocation Setting 3 Switch) to TRUE.
Area 3 Area 2 Area 1
OUT area
Node
address
IN area
Area 1 Area 2 Area 3
0073 OIC0053 OIC0033 OIC0023 OIC0043 OIC0063 OIC
1073 OIC1053 OIC1033 OIC1023 OIC1043 OIC1063 OIC
2073 OIC2053 OIC2033 OIC2023 OIC2043 OIC2063 OIC
1673 OIC1653 OIC1633 OIC1623 OIC1643 OIC1663 OIC
2673 OIC2653 OIC2633 OIC2623 OIC2643 OIC2663 OIC
3673 OIC3653 OIC3633 OIC3623 OIC3643 OIC3663 OIC
Master Unit
Master Unit
Slave
Slave
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