Overview Of The Memory Allocated To The Ethercat Slave Unit - Omron CJ1W- ECT21 Operation Manual

3 Memory Allocations
3-1 Overview of the Memory Allocated to
the EtherCAT Slave Unit
The following CPU Unit words are allocated to the EtherCAT Slave Unit.
• CPU Unit's allocated CIO Area words
These words contain the status information.
• CPU Unit's allocated DM Area words
These words contain the I/O Communication Area Setting Tables and I/O Communication Area Ref-
erence Tables.
The words shown in the following diagram are allocated according to the unit number setting. For each
Unit, there are 25 words allocated in the CIO Area and 100 words allocated in the DM Area.
• First word allocated in the CIO Area: n = CIO 1,500 + (25 x unit number)
• First word allocated in the DM Area: m = D30,000 + (100 x unit number)
CIO 1500
CIO 1501
Unit number 0
CIO 1524
CIO 1525
CIO 1526
Unit number 1
CIO 1549
CIO 1875
CIO 1876
Unit number 15
CIO 1899
D30000
D30001
Unit number 0
D30099
D30100
D30101
Unit number 1
D30199
D31500
D31501
Unit number 15
D31599
Precautions for Correct Use
Setting results are refreshed when the Unit restarts or when the Unit is powered ON.
3 - 2
CPU Unit
Allocated CIO Area words
(Allocated to the Unit as a CPU Bus Unit)
25 words
25 words
25 words
Allocated DM Area words
(Allocated to the Unit as a CPU Bus Unit)
100 words
100 words
100 words
EtherCAT Slave Unit
Local memory
Unit/Slave status
(I/O refresh)
I/O Communication
Local memory
Area Setting Tables
(I/O refresh)
I/O Communication
Area Reference
Tables
(Power ON or
restart the Unit)
CJ-series EtherCAT Slave Units Operation Manual (W541)
25 words
100 words