Supplement to User Manual - ENGLISH Modbus Server
SU_ModbusV2-8, 2015-03-02 57
6 Request of a Physical Quantity or a Diagnostic Value
Every physical quantity or every diagnostic value is provided in a block of 16 Modbus registers in predefined Modbus reg-
ister address ranges.
Besides the unscaled and scaled measured values, the state of the measured value and the unit of measurement, among
others, can be requested as parameters (see Tab. 6.3).
The Modbus register address results as a sum of:
• the start address,
• the offset of the physical quantity or diagnostic value and
• the offset of the parameter.
Start Address
Each channel is assigned to a start address:
For the start address for channel-independent diagnostic values see section 8.1.
Offset of the Physical Quantity or Diagnostic Value
For the calculation of the Modbus register address, an offset is added to the start address of the channel.
Tab. 6.1: Start addresses of the channels
channel start address
A 1000
B 2000
C 3000
D 4000
Z 9000
Y 10000
Tab. 6.2: Offset for the physical quantities or the diagnostic values
value offset preset unit of
measurement
note calculation
possible
1
physical quantity
medium temperature T
fluid
(at the location
where the flow rate is measured, supply line or
return line)
0°C no
medium temperature T
aux
(the other tempera-
ture, return line or supply line)
16
medium pressure p
fluid
(at the location where
the flow rate is measured, supply line or return
line)
32 bar
medium pressure p
aux
(the other pressure,
return line or supply line)
48
signal amplitude 64 -
sound speed 80 m/s yes
flow velocity 96 m/s
volumetric flow rate 112 m³/h
volumetric flow rate,
totalizer for positive flow direction
128 m³
volumetric flow rate,
totalizer for negative flow direction
144
standard volumetric flow rate
(gas measurement)
160 m³/h
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