CIO Area Allocations
User Settings
Offset
Bit
15
0
n
1
n+1
2
n+2
3
n+3
4
n+4
5
n+5
6
n+6
7
n+7
8
n+8
9
n+9
10
n+10
11
n+11
Communications status 1
12
n+12
Communications status 2
13
n+13
14
Communications status 3
n+14
15
n+15
16
n+16
17
n+17
18
n+18
19
n+19
20
n+20
21
n+21
22
n+22
23
n+23
24
FINS/TCP Connection Status
n+24
4-2-2
Details of the Allocated CIO Area Words
Unit Control Bits (CPU Unit to EtherNet/IP Unit) (n)
8
7
Unit control bits
(Reserved)
Unit status 1
Unit status 2
(Reserved)
Note The reserved words are regularly refreshed with all zeroes.
The functions of the allocated CIO Area words are described in the following
section.
15
14
13
n
Bit
Switch
0 to 1
(Not used.)
2
Tag Data Link Start
Bit
0
Data direction
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
12
11
10
9
8
7
6
5
Status
Manipulated
by
---
---
ON
User
OFF
Unit
Section 4-2
4
3
2
1
0
Tag Data Link Start Bit
Tag Data Link Stop Bit
Adjust Clock Bit
Unit operation
---
The tag data link starts when this bit
is switched from OFF to ON.
Turned OFF by Unit after the tag
data link starts operating.
71