Overview Of Word Allocations - Omron CJ1W-PNT21 Operation Manual

Overview of Word Allocations

5-1 Overview of Word Allocations
5-1-1 CIO Area Word Allocations
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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)
Unit #0
Unit #1
Unit #15
Unit #0
Unit #1
Unit #15
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.
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
Unit No.
(decimal)
0 (0) CIO1500 to CIO1524
1 (1) CIO1525 to CIO1549
2 (2) CIO1550 to CIO1574
PLC CPU Unit
CPU Bus Unit CIO Area
CIO 1500
CIO 1501
25 words
CIO 1524
CIO 1525
CIO 1526
25 words
CIO 1549
CIO 1875
25 words
CIO 1899
CPU Bus Unit DM Area
D30000
D30001
100 words
D30099
D30100
D30101
100 words
D30199
D31500
100 words
D31599
Figure 5.1: Memory allocations overview
Allocated words
PROFINET IO Controller Unit
Unit Number: 0
Local memory
Software switches
(I/O refresh) status
Local memory
No exchange
Reserved for future use
Unit No. Allocated words
(decimal)
8 (8) CIO1700 to CIO1724
9 (9) CIO1725 to CIO1749
A (10) CIO1750 to CIO1774
Section 5-1
25 words
100 words