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CIO Area Allocations Section 4-2
4-2 CIO Area Allocations
4-2-1 Overview of the Allocated CIO Area Words
The various kinds of data are stored in the allocated CIO Area words, which
are identified by the offset from the beginning word (n) allocated to each Unit.
There are two patterns for the layout of the allocated CIO Area words: the
default settings and user settings. The layout can be selected in the Status
Area settings in the Edit Parameters Dialog Box from the CX-Programmer.
To set a customer areas, select User defined for the Layout Type on the Sta-
tus Area Tab Page.
The beginning word n is calculated by the following equation:
Beginning word n = CIO 1500 + (25 × unit number)
Default Settings
Note The reserved words are regularly refreshed with all zeroes.
Unit control bits
(Reserved)
Target Node PLC Operating Information
(4 words only)
Target Node PLC Error Information
(4 words only)
Unit status 1
Unit status 2
Communications status 1
Communications status 2
Communications status 3
(Reserved)
Registered Target Node
(4 words only)
Normal Target Node
(4 words only)
FINS/TCP Connection Status
CPU Unit → EtherNet/IP Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
EtherNet/IP Unit → CPU Unit
Offset
Bit
Data direction
n
n+1
n+2
n+3
n+4
n+5
n+6
n+7
n+8
n+9
n+10
n+11
n+12
n+13
n+14
n+15
n+16
n+17
n+18
n+19
n+20
n+21
n+22
n+23
n+24
15 8 7 0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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