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Overview of Word Allocations
Section 4-1
4-1
Overview of Word Allocations
The words shown in the following diagram are allocated according to the unit
number setting. For each CPU Bus 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)
Note The allocated DM words are not used by the PROFIBUS-DP Master Unit.
However, exchange of data to the allocated DM words is reserved for future
use, and it is therefore not recommended to use the allocated DM words for
other purposes.
PROFIBUS-DP Master unit
Unit Number: 0
25 words
Local memory
100 words
Local memory
CIO 1500
CIO 1501
CIO 1524
CIO 1525
CIO 1526
CIO 1549
CIO 1899
25 words
25 words
25 words
CIO 1875
Unit #0
Unit #1
Unit #15
D30000
D30001
D30099
D30100
D30101
D30199
D31599
100 words
100 words
100 words
D31500
Unit #0
Unit #1
Unit #15
CPU Bus Unit CIO Area
CPU Bus Unit DM Area
PLC CPU Unit
Software switches
(I/O refresh) status
No exchange
Reserved for future use
Summary of Contents for SYSMAC CJ1W-PRM21
Page 2: ...iv...
Page 36: ...22 Basic Operating Procedure Section 1 5...
Page 52: ...38 Defining PROFIBUS DP in the Software Section 2 5...
Page 112: ...98 Allocated CIO Area Words Section 4 2...
Page 122: ...108 Command Response Reference Section 5 2...
Page 160: ...146 Replacing the Unit Section 7 8...
Page 174: ...160 Appendix...
Page 180: ...166 I O Data Conversions Appendix D...
Page 186: ...172 Configurator Error and Warning Messages Appendix E...
Page 187: ...173 Index...
Page 188: ...174 Index...
Page 190: ...176 Revision History...