Software Parameterization - Siemens SITRANS TW 7NG3242 Betriebsanleitung

3.7.4

Software parameterization

The following order must be observed for the parameterization of the plug:
1. HART-Communicator
− Selection sensor class = mV transmitter
−
Selection sensor type = -120 to 1000 mV
− Input of following special characteristic pairs:
− Selection type of linearization = special characteristic
2. SIMATIC PDM
− Selection sensor class = mV transmitter
− Selection sensor type:
− The corresponding special characteristic pairs and the type of linearization are
set automatically by SIMATIC PDM.
3. If the U/I input plug is o be used in connection with another ("customer-specific")
special characteristic, the voltage divider R1, R2 or the current shunt R3 of the
U/I input plug must be taken into account in the characteristic input (see circuit
diagram figure 10).
4. In voltage measurement (measuring range –1.2 to 10 V), all input signals X
be multiplied with the voltage divider:
The characteristic input values X
Example: (V-signal corresponds to the physical oxygen content [%O2])
X : 1 V
1
X : 7 V
2
X : 8 V
n
The input values X
unit mV.
(X
SKL,1
SITRANS TW
A5E00054075-05
Measuring range
-1.2 to 10 V
-12 to 100 mA
Measuring range
-1.2 to 10 V
-12 to 100 mA
Sensor signal
X -> X (input values)
i
SKL,i
-> X : 91.2409 mV
SKL,1
-> X : 638.6861 mV
SKL,2
-> X : 729.9270 mV
SKL,n
must be entered in the
SKL,i
= X x R = 1 V x 0.09124087 = 0.09124087 V = 91.2409 mV)
1 T
X1 = -109.4891 mV
X2 = 912. 4088 mV
X1 = -120 mV
X2 = 1000 mV
Sensor type
-1.2 to 10 V (with U/I plug (7NG3092-8AW)
-12 to 100 mA (with U/I plug 7NG3092-8AW)
must be specified in the unit mV.
SKL,i
Linearized signal
Y (input values)
SKL,i
Y :
SKL,1
Y :
SKL,2
Y :
SKL,n
** corresponds to [%O2]
Hardware functions
Value pairs
Y1 = -1.2000 V
Y2 = 10.0000 V
Y1 = -12 mA
Y2 = 100 mA
must
i
3**
21**
35**
97