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The Transducer Block
3.9 PR_CUST_LIN Block (PA Slot 4) Parameter List
SITRANS TH400 PROFIBUS® PA
36
Configuration Manual, 02/2007, A5E01039143-01
3.9
PR_CUST_LIN Block (PA Slot 4) Parameter List
3.9.1
Linear interpolation linearisation, Description
LinType 1 = “Linearisation Table” generates a customer specific linear interpolation
linearisation. Linear interpolation linearisation can be used on mV, ohmic and potentiometer
signals.The linear interpolation linearisation is defined by straight lines drawn between the
entered X / Y (input / output) coordinates. The linearisation table must consist of 10 to 50
coordinate sets. The X values of the coordinates must be entered in ascending order. The
lowest and highest X values function as the lower and the upper limit respectively. All X
values must be entered as µV, Ohm or % for Voltage, Resistance or Potentiometer
measurements in that order. The table output will be converted to actual chosen
PRMARY_VALUE_UNIT (Example: 1000 / 3000 as X / Y values: output will read 3,00 if
PRIMARY_VALUE_UNIT is set to “mV” and 1 mV is connected to input).
3.9.2
Linear Interpolation Linearisation, Parameter List.
Parameter
Rel.
Index
PA
Description
Type
Store Size
byte
RO /
R/W Min. Max. Default
TAB_MIN_NUMBER
29
Minimum number of linearisation points allowed (10)
Unsigned
8
N
1
RO
10
TAB_MAX_NUMBER
30
Maximum number of linearisation points allowed (50)
Unsigned
8
N
1
RO
50
TAB_ACTUAL_NUMBER 31
Number of linearisation points in the linearisation table.
Unsigned
8
SRC 1
R/W
11
TAB_X_Y_VALUE1
32
Linearisation x,y coordinate 1
Float
array
SRC 8
R/W
0, 0
TAB_X_Y_VALUE2
33
Linearisation x,y coordinate 2
Float
array
SRC 8
R/W
1000,
100
TAB_X_Y_VALUE3
34
Linearisation x,y coordinate 3
Float
array
SRC 8
R/W
2000,
200
TAB_X_Y_VALUE4
35
Linearisation x,y coordinate 4
Float
array
SRC 8
R/W
3000,
300
TAB_X_Y_VALUE5
36
Linearisation x,y coordinate 5
Float
array
SRC 8
R/W
4000,
400
TAB_X_Y_VALUE6
37
Linearisation x,y coordinate 6
Float
array
SRC 8
R/W
5000,
500
TAB_X_Y_VALUE7
38
Linearisation x,y coordinate 7
Float
array
SRC 8
R/W
6000,
600
TAB_X_Y_VALUE8
39
Linearisation x,y coordinate 8
Float
array
SRC 8
R/W
7000,
700
TAB_X_Y_VALUE9
40
Linearisation x,y coordinate 9
Float
array
SRC 8
R/W
8000,
800
TAB_X_Y_VALUE10
41
Linearisation x,y coordinate 10
Float
array
SRC 8
R/W
9000,
900