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Ecrin v4.20 - Doc v4.20.01 - © KAPPA 1988-2011 Diamant Master Guided Session #1 • DmmGS01 - 17/33
E.5 Derived channels and alarm settings
E.5.1 Creating Derived Channels
Derived channels are the results of calculations that can be required by the user.
The objective of a derived channel is to create an output data set resulting from n input
channels. Writing ‘Y’ the Y values in the inputs, the values of the new channel are defined as:
Ynew[t]= f(Y1[t], Y2[t], Y3[t], …, Yn[t],a1,a2,…, ak).
Where the parameters ‘a1’… ‘ak’ are user defined constraints.
Any data channel can be used in the formula written by the user in the dialog accessed by
pressing in the top toolbar:
The user can select within basic operation
types:
and within standard mathematical functions by pressing .
Write a simple formula to detect production values smaller than 1000 bpd and set them to 0
and keep the rest unchanged.
 Type ‘if (a<b, 0, a)’ in the formula box.
 Press on ‘Update list’ to display the parameters used in the formula as variables for the
calculation.
 We are going to assign ‘a’ as the
production channel values, specify it by
pressing on and checking the
Ecr01q Fltd data node: