Table of Contents
Advertisement
Linear scaling between two interpolation points
Scaling is specified using 2 interpolation points as parameters per channel. The reference
values for the interpolation points are specified in the KNX context and in the LOGO! 8
context. The following directions must be observed:
Direction
LOGO → KNX
KNX → LOGO
Transformation of the values is carried out using the linear equation: y = a•x + b (a =
gradient; b = offset)
Starting with the interpolation points (X
calculated using the following formulae:
Gradient (a):
Offset (b):
Example:
Image 8-3
Scaling is, on the one hand, dependent on the two interpolation points as described above,
but also on the format of the referenced data in the LOGO! (8, 16 bits) and KNX (1, 2 bytes).
CMK2000
Operating Instructions, 11/2015, A5E34877550B/001
Input value (X value)
Corresponds to LOGO! values
Corresponds to KNX values
Scaling with two interpolation points
Configuring and commissioning using ETS
8.5 Parameter assignments for the KNX channels
Output value (Y value)
Corresponds to KNX values
Corresponds to LOGO! values
;Y
) and (X
;Y
), the constants in the equation are
A
A
B
B
49
Hide quick links:
Advertisement
Table of Contents
