Specifications

2 S7-1200/1500 Innovations
2.6 Optimized blocks
Programming Guideline for S7-1200/1500
V1.2, Entry ID: 81318674
11
Copyright
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Siemens AG 2014 All rights reserved
2.6.2 S7-1500: Setup of optimized blocks
Figure 2-6: Optimized block of S7-1500
B
y
t
e
s
Bits
0 1 2 3 4 5 6 7
W1
W2
B1
X1
X2
X3
X4
B
y
t
e
s
Bits
0 1 2 3 4 5 6 7
0
X1
1
B1
2
X2 X3
3
4
W1
5
6
X4
7
8
W2
9
Standard block
Optimized block
Optimized
Standard
Reserve
Figure 2-7: Memory space assignment in optimized blocks
B
y
t
e
s
4 Byte are always read at once
0
DW DW W B W W
16
W W W BBBBXXX
32
48
64
80
96
102
DW DW DW W W
128
W BXX
144
Reserve
Reserve
1
2
Optimized
1. Structures are stored separately and can thus be copied as one block.
2. Retentive data are stored in a separate area and can be copied as one block.
In the event of a power failure, these data are stored CPU-internally. "MRES"
resets these data to the start values stored in the load memory.
Properties
 No data gaps are formed since larger tags are located at the beginning of the
block and smaller ones at the end.
 Fast access due the best possible storage in the processor (All tags are stored
in a way so that the processor of the S7-1500 can directly read or write all tags
with just one machine command).
 Boolean tags are stored as byte for faster access. The controller therefore
does not have to mask the access.