Overview of Word Allocations
Section 5-1
62
5-1
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)
Figure 5.1: Memory allocations overview
5-1-1
CIO Area Word Allocations
Software switches, PROFINET IO Controller Unit status, and Slave Status
data are allocated in the CIO Area according to the unit number, as shown
below. Software switches are bits used as commands from the PLC CPU to
the PROFINET IO Controller Unit to enable executing Unit functions.
/i
PROFINET IO Controller 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
Note
The allocated DM words are not used by the PROFINET IO Controller 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.
Unit No.
(decimal)
Allocated words
Unit No.
(decimal)
Allocated words
0 (0)
CIO1500 to CIO1524
8 (8)
CIO1700 to CIO1724
1 (1)
CIO1525 to CIO1549
9 (9)
CIO1725 to CIO1749
2 (2)
CIO1550 to CIO1574
A (10)
CIO1750 to CIO1774
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