![background image](http://html1.mh-extra.com/html/eaton/easye4-series/easye4-series_manual_3910990167.webp)
5. Programming on the device
5.7 Organizing marker ranges
5.7 Organizing marker ranges
The easyE4 has 1024 bytes available for data storage.
With specific restrictions, the corresponding memory can be accessed using bytes,
words, double words, and bits.
This means that four different operands with their own address can be used to access
the exact same data range. Accordingly, it is extremely important to pay close attention
to each operand's address in order to avoid accidental duplicate access.
Markers can be used to access data as follows (with the corresponding address
range):
l
M 1...512
l
MB 1...512
l
MW 1...512
l
MD1...256
Avoid accidental double marker assignments.
Otherwise you might address the 512 bit markers sim-
ultaneously via the first 64 marker bytes, 32 marker words or
16 marker double words and thus produce uncontrollable
states.
If you use:
l
Marker bytes, starting at MB 65,
l
Marker words, starting at MW513
and
l
marker double words starting at MD 127,
this will prevent duplicate assignments with bit markers that you may be using in the
program.
The following table provides an overview.
Byte in memory Bit access
B
Byte access
MB
Word access
MW
Double word access
MD
1
8...1
1
1
1
2
16...9
2
3
24...17
3
2
4
32...25
4
5
48...41
5
3
2
6
48...41
6
7
56...49
7
4
8
64...57
8
Table 61: Available markers
easyE4
11/18 MN050009 EN www.eaton.com
163
Содержание easyE4 series
Страница 1: ...Manual 11 18 MN050009 EN easyE4 Manual...
Страница 4: ......
Страница 16: ...12 easyE4 11 18 MN050009 EN www eaton com...
Страница 22: ...0 1 About this manual 18 easyE4 11 18 MN050009 EN www eaton com...
Страница 40: ...1 easyE4 control relays description 1 10 Safety regulations 36 easyE4 11 18 MN050009 EN www eaton com...
Страница 169: ...easyE4 11 18 MN050009 EN www eaton com 165...
Страница 462: ...6 Function blocks 6 4 Timing and counter relay example 458 easyE4 11 18 MN050009 EN www eaton com...
Страница 490: ...7 System settings 7 16 Time and Date setting 486 easyE4 11 18 MN050009 EN www eaton com...
Страница 520: ...9 easyE4 inside 9 7 NET network 516 easyE4 11 18 MN050009 EN www eaton com...
Страница 524: ...10 Diagnostics messages of the operating system 10 2 Diagnostics buffer 520 easyE4 11 18 MN050009 EN www eaton com...
Страница 570: ...11 Connection to other devices 11 6 E mail function 566 easyE4 11 18 MN050009 EN www eaton com...
Страница 578: ...12 Faults 12 4 Functionality of the NET faulty 574 easyE4 11 18 MN050009 EN www eaton com...
Страница 582: ...13 Maintenance 13 3 Storage transport and disposal 578 easyE4 11 18 MN050009 EN www eaton com...
Страница 594: ...590 easyE4 11 18 MN050009 EN www eaton com...
Страница 614: ...610 easyE4 11 18 MN050009 EN www eaton com...