Proline Promass F 100 Modbus RS485
System integration
49
3 – 2 – 1 – 0
Byte 3
(SEEEEEEE)
Byte 2
(EMMMMMMM)
Byte 1
(MMMMMMMM)
Byte 0
(MMMMMMMM)
* = factory setting, S = sign, E = exponent, M = mantissa
INTEGER
Sequence
Options
1.
2.
1
–
0
– 3 – 2 *
3 – 2 –
1
–
0
Byte 1
(MSB)
Byte 0
(LSB)
0
–
1
– 2 – 3
2 – 3 –
0
–
1
Byte 0
(LSB)
Byte 1
(MSB)
* = factory setting, MSB = most significant byte, LSB = least significant byte
STRING
Presentation taking the example of a device parameter with a data length of 18 bytes.
Sequence
Options
1.
2.
...
17.
18.
1
–
0
– 3 – 2 *
3 – 2 –
1
–
0
Byte 17
(MSB)
Byte 16
...
Byte 1
Byte 0
(LSB)
0
–
1
– 2 – 3
2 – 3 –
0
–
1
Byte 16
Byte 17
(MSB)
...
Byte 0
(LSB)
Byte 1
* = factory setting, MSB = most significant byte, LSB = least significant byte
9.2.6
Modbus data map
Function of the Modbus data map
The device offers a special memory area, the Modbus data map (for a maximum of 16
device parameters), to allow users to call up multiple device parameters via Modbus RS485
and not only individual device parameters or a group of consecutive device parameters.
Grouping of device parameters is flexible and the Modbus master can read or write to the
entire data block simultaneously with a single request telegram.
Structure of the Modbus data map
The Modbus data map consists of two data sets:
• Scan list: Configuration area
The device parameters to be grouped are defined in a list in that their Modbus RS485
register addresses are entered in the list.
• Data area
The measuring device reads out the register addresses entered in the scan list cyclically
and writes the associated device data (values) to the data area.
For an overview of device parameters with their respective Modbus register
information, please refer to the "Modbus RS485 register information" section in the
"Description of device parameters" documentation .
