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5. Programming on the device
5.3 Circuit diagram elements
via the first 12 marker bytes (MB), 6 marker words or 3 marker double words. This will
generate undefined states. When write accesses are made successively within an MD,
such as to MD1, MW2, MB4 or M32, the last write operation is retained.
Observing the following wiring rules will prevent the double assignment of
marker bits.
For easyE4 with the marker bits M01-M96 use
Marker bytes, starting at MB13
Marker words, starting at MW07
Marker double words, starting at MD04
Retentive markers
You can declare a freely definable contiguous range between marker bytes as retent-
ive.
Device
Marker range that can be declared as retentive
easyE4
MB01 - MB400
For more information on how to configure retentive markers in order to save data in a
non-volatile manner, please refer to → Section "Retention function", page 473
Numeric formats
The values of the data types marker byte (MB) and marker word (MB) are processed
as unsigned. In order to store negative values, you must use a marker double word.
This fact must be particularly taken into account if the output of a function block can
take on a negative value. You must temporarily store this value in a marker double word
in order to transfer it to the input of a function block, otherwise the sign information will
be lost.
The easyE4 device processes calculations with a signed 31-bit value.
The value range is: –2147483648 to +2147483647
In the case of a 31-bit value, the 32nd bit is the sign bit.
Bit 32 = status 0 -> positive number.
Bit 32 = status 1 -> negative number.
Example
00000000000000000000010000010010
bin
= 412
hex
= 1042
dez
11111110110111001111010001000111
bin
= FEDCF447
hex
= –19073977
dez
132
easyE4
11/18 MN050009 EN www.eaton.com
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...