WattMaster WM-WCC3-TGD-01B - Manual (Page 256)

WCC3.EXE SCREEN DESCRIPTIONS
WCC III Technical Guide 3-142
This graph can be reconstructed within the WCC III system with
the use of a look up table. For this example, assume that the 0-1
VDC signal from the sensor is connected to analog input 2A3
(Analog input #3 on satellite controller #2). The signal from the
sensor is the Analog Input for the look up table, and the actual
temperature is the value of global analog #121. The data entered in the IN column must be in sequence with “1”
being the smallest and “60” the largest. If the input data is less than
the smallest value in the IN column, the smallest IN value on the
screen is used. If the input is greater than the largest IN value, the
largest IN value is used.
ANALOG GLOBAL
LOOK UP TABLE MODE
Mode 5: Look Up Table
Eight of the global analog screens (GA121-128) have a “look up table” available. The look up table generates an output number based on
the value of an input number.
This mode is very useful for curve fi tting applications. For example, consider a non-linear temperature sensor that has the characteristics
shown on the following graph:
Actual Temperature (Deg F)
Signal
from
Temperature
Sensor
(VDC)
0.4
0.5
0.6
0.8
0.7
0.9
1.0
100 90 80 60 70 50 40
Analog Global Screen’s WCC III Logical Address is GAXXX, where GA = Global Analog and XXX = Global Analog Address
Analog Global Look Up Table Mode