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5.
Setting Remote I/O Allocations
The Scan List Wizard-Set how to allocate I/O data to PLC Memory Block Window, which specifies the
I/O data allocation method for devices, will be displayed. An example is shown below.
Specify the allocation method and click the Next Button.
There are two methods for allocation.
Allocate each device by
channel
Allocate so that the total
number of allocated words
is minimized (two devices
may be allocated to one
word)
Examples of allocation are as follows:
Allocation when outputs or inputs are as shown below
#00
#01
#02
#03
#04
#05
148
Each slave is always allocated the low byte (lower 7 bits) of the word.
Therefore, each slave is allocated one word even if 1-byte I/O slaves
come sequentially.
Example:
High
15
...
If there are 1-byte I/O slaves, allocation is in the order of low byte (lower
7 bits) to high byte (upper 7 bits) to create as few unused areas as pos-
sible.
Example:
High
15
...
#3
1 byte
2 bytes
1 byte
4 bytes
1 byte
1 byte
Low
8
7
...
0
#0
#1
Node address order
#3
#4
#6
Unused
Low
8
7
...
0
#0
#1
Node address
#4
order
#6
Unused
B Editing CS/CJ-series DeviceNet Unit Parameters
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