APPENDIX B: MODBUS PROTOCOL B.3 DATA TYPE
GEK-106310-AF F650 DIGITAL BAY CONTROLLER B-7
B.3 Data type
TYPE LENGTH DESCRIPTIÓN
F1 1 Boolean data type.
As it is a bit, for evaluating it we need a memory address and a bit. For example: Value 0x1
A41-0001101001000001b
Bit 15 0
Bit 14 0
Bit 13 0
Bit 12 1
Bit 11 1
Bit 10 0
Bit 09 1
Bit 08 0
Bit 07 0
Bit 06 1
Bit 05 0
Bit 04 0
Bit 03 0
Bit 02 0
Bit 01 0
Bit 00 1
F2 2 Integer with 4 bytes sign.
Must be scaled, by multiplying the sent value by 1000, or dividing the received value by 1000. For example, if a value
of 34509
is received, the converted value is 34.509. To write the value 334, the value 334000 is sent.
This prevents the loss of accuracy involved in using float values.
Example: 12312d=0x00003018.
Real Value = 12312/1000=12.312
F3 2 4-byte Floating
Example: 1240.556 = 0x449B11CB
F4 1 Integer with 2 bytes sign.
Example: 123 = 0x007B
F5 2 Integer without 4 bytes sign.
Example: 12312 = 0x00003018
F6 4 8 bytes Float
Example: 123.324 = 0x405ED4BC6A7EF9DB
F7 1 Characters without sign. As it needs to be sent in a register, i.e. in two bytes, the character goes below.
Example: ‘
β
’ = 0x00E1
F8 1 Characters with sign As it needs to be sent in a register, i.e. in two bytes, the character goes below.
Example: ‘A’ = 0x0041
F9 16 String. Chain of characters with a fixed length (32 bytes). The end of the string is marked with “\0”.
Example: “ABC” = 0x41x42x43x00....
F10 1 This is a 16-bit integer without sign. Each value that can be taken by this integer has a correspondence in the
da
tabase Auxiliary Table. In this table we can find the corresponding chain, which must be shown for each value. In
memory, only an integer value is received.
Example: 0, 1Correspond to CLOSE, OPEN
F11 3 Milliseconds passed since January/1/2000 at 00:00:00.000.
F12 1 Unsigned int 16 bit (enumerated), example: In MODBUS address Ox0EBE is the FAULT TYPE
0=GROUND
1=PHASE
2=3 PH
3=AG
4=ABG
5=AB
6=BG
7=BCG
8=BC
9=CG
10=CAG
11=CA
12=NAF
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