Xylem Expert 7060_7070_Modbus - Manual (Page 13)

Communication protocol Serie30
Page 19/37
5.2.2 Information values
No. Description of the coefficient Unit
80 Minimum pressure of sensor P1 bar
81 Maximum pressure of sensor P1 bar
82 Minimum pressure of sensor P2 bar
83 Maximum pressure of sensor P2 bar
84 Minimum temperature of temperature sensor °C
85 Maximum temperature of temperature sensor °C
86 Minimum temperature of sensor P1 °C
87 Maximum temperature of sensor P1 °C
88 Minimum temperature of sensor P2 °C
89 Maximum temperature of sensor P2 °C
90 Minimum value of channel CH0
91 Maximum value of channel CH0
92 Pressure for minimum analogue signal * bar
93 Pressure for maximum analogue signal * bar
94 Minimum analogue signal* mA , V
95 Maximum analogue signal* mA , V
* Required for scaling the analogue output (see below)
The information values are readable only.
The information for no. 94 and no. 95 may be in mA or V, according to whether the device possesses a voltage output or a
current output (function 100 index 3).
Only coefficients 68, 69 and 80 .. 95 are available for devices of Class.Group = 5.1.
5.2.3 Scaling of channels CH0, P1 and P2
CH0, P1 and P2 are linearly scalable with zero point and gain factor: Value = gain factor * value + offset
Standard values: Offset = 0.0, gain factor = 1.0
It is also possible to influence the offset values via function 95 (see function 95).
The gain factor should be used for calibration purposes only, and not to alter pressure units. The latter operation should
always be carried out by the master! In order to represent other pressure units via the analogue output, the unit conversion must
be taken into account when scaling the analogue output.