385 cip message communications appendix d, Logical segment – Omron SYSMAC CJ1W-EIP21 User Manual
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385
CIP Message Communications
Appendix D
Specify the size of Link Address when the Extended Link Address Size is set to “1.” The following diagram
shows the Port Segment value in this case.
Always set the Link Address to an even number of bytes. If there is an odd number of bytes, pad the Link
Address with “00” so that it has an even number of bytes.
Logical Segment
The Logical Segment is used to specify the request path.
The 32-bit logical address format is reserved and cannot be used.
The 8-bit and 16-bit logical address can be used for the Class ID and Instance ID, which specify the request
path.
Segment Type
Port Identifier
7 6 5
4 3
2
1 0
0 0 0
Extended Link
Address Size
1
7 6 5 4 3 2 1 0
Link Address Size
7 6 5 4 3 2 1 0
Link Address
7 6 5 4 3 2 1 0
· · · · · · · · · · · ·
Link Address
· · · · · ·
→
→
Logical Type
Description
4
3
2
0
0
0
Class ID
0
0
1
Instance ID
0
1
0
Member ID
0
1
1
Connection Point
1
0
0
Attribute ID
1
0
1
Special (Do not use the logical addressing definition for the Logical Format.)
1
1
0
Service ID (Do not use the logical addressing definition for the Logical Format.)
1
1
1
Reserved
Logical Format
Description
1
0
0
0
8-bit logical address
0
1
16-bit logical address
1
0
32-bit logical address
1
1
Reserved
Segment Type
Logical Type
7 6 5
4 3 2
1 0
0 0 1
Logical Format
Segment Format Bits