User Manual

6.5.1 Activate the calculator
Assign input A to activate the calculator.
Main menu > Commissioning > Extra configuration > Data acquisition > Calculator 1…2 >
Config
uration
Operating lin
e 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
3123S23
Chiller 1
Chiller 2
Return Flow
Calculator 1
en
Example for output
cal
culation
Output cal
culation is based on a physical relation:
TcVP  

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