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6.5.1
Activate the calculator
Assign input A to activate the calculator.
Main menu > Commissioning > Extra configuration > Data acquisition > Calculator 1…2 >
Configuration
Operating line
Range
Factory setting
Input A
---, N.X1, N.X2, ...
---
Input B
---, N.X1, N.X2, ...
---
Input C
---, N.X1, N.X2, ...
---
Constant u, v, w
-50.0... +999.0
1.0
Constant x, y, z
–50... +9999
1
Formula
Max. 20 characters
(A-B)*C
Modulating output
---, N.Y1, N.Y2, …
---
Max. 20 characters.
Rules to enter formulas
Max. 2 parentheses in sequence, e.g.
((
PEMDAS convention applies: ^ * / + -
Numbers are not entered direct, but via constants.
No spaces in the formula.
a
A - B C
T
T
v
31
23
S
23
Chiller 1
Chiller 2
Return
Flow
Calculator 1
en
Example for output
calculation
Output calculation is based on a physical relation:
T
c
V
P
P
=
Output
(kW)
V
= Volumetric flow (m³/s)
= Medium density (kg/m³)
c
= Specific heat capacity of the medium (kJ/ (kg * K))
T
= Temperature difference (K)
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Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies Data
acquisition
01.04.2010