Ecograph T, RSG35 Appendix
Endress+Hauser 143
Priority of operators / functions
The formula is processed based on universally applicable mathematics rules:
• Parentheses first
• Exponents before multiplication or division
• Multiplication or division before addition or subtraction
• Calculate from left to right
Operators
Arithmetic operators:
Operator Function
+ Addition
- Subtraction / negative sign
* Multiplication
/ Division
Decimal separator
Both the decimal point and the decimal comma can be used in the formula editor.
Thousand separators are not supported.
Check whether formula is valid or malfunctions
A formula is invalid if:
• The channels used are not switched on or are in the wrong operating mode (is not
verified during formula entry as the channel could be switched on subsequently)
• It contains invalid characters/formulas/functions/operators
• Syntax errors (e.g. wrong number of parameters) occur in the formulas
• There are incorrect parentheses in the formula (number of open parentheses unequal to
number of closed parentheses)
• Division is by zero
• A channel refers to itself (infinite recursion)
Invalid formulas are deactivated when the setup is accepted or the device is started.
Undetectable errors: wherever possible, errors in the formula are reported immediately
during input. However, given the possible complexity of the formula entered (e.g. nested
formulas) it is not possible to detect every error.
"Totalization" submenu
Navigation Expert → Application → Maths → Maths x → Totalization
Description Settings only needed if the calculated value - e.g. for quantity calculation - should be
integrated. Analysis time frames, see "Signal analysis".
Totalization
Navigation Expert → Application → Maths → Maths x → Totalization → Totalization
Direct access code: 400050-00x
Examples: Maths 1: 400050-000; Maths 4: 400050-003
Description By totalizing the analog signal (e.g. flow rate in m³/h) quantities (in m³) can be calculated.
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