100 Profibus Communications
Section 12: Profibus Communications Instruction Manual
April 2017 LIQ-MAN-56
12.4 Data Transmission
General
The 56 uses RS-485 communication technology for transmission. When messages are
transmitted on Profibus networks, for word transfer (more than one byte), the high byte is
transferred first, followed by the low byte (Big-Endian/Motorola format).
56 Modules
The details of measurement modules and relay modules are shown below in the following tables:
12.4.1 Measurement Modules
Measurement modules provide the PV value for each signal board, the PV unit (Table 12-3),
and the PV type (Table 12-4)
Data Size
Module Module Name Type Bytes Identifiers
Signal Input Board 1
1 PV1 Value float 4 0x41,0x83,0x01
2 PV1 Unit uint 2 0x41,0x81,0x02
3 PV1 Type uchar 1 0x41,0x80,0x03
4 Temperature1 float 4 0x41,0x83,0x04
5 Temperature1 Unit uint 2 0x41,0x81,0x05
Signal Input Board 2
6 PV2 Value float 4 0x41,0x83,0x06
7 PV2 Unit uint 2 0x41,0x81,0x07
8 PV2 Type uchar 1 0x41,0x80,0x08
9 Temperature 2 float 4 0x41,0x83,0x09
10 Temperature 2 Unit uint 2 0x41,0x81,0x0A
Dual Conductivity Input Boards
11 Conductivity Ratio float 4 0x41,0x83,0x0B
12 % Passage float 4 0x41,0x83,0x0C
13 % Rejection float 4 0x41,0x83,0x0D
Dual Flow Input Boards
14 Flow Recovery float 4 0x41,0x83,0x0E
15 Flow Difference float 4 0x41,0x83,0x0F
16 Flow Unit uint 2 0x41,0x81,0x10
Table 12-3. Measurement Modules
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