ABB CM30 User Manual page 58

ControlMaster CM30 and CM50
Universal process controllers,
...Functions / ...Math Blocks
Multiplexer Setup
Source 1
Source 1 Constant
Source 2
Source 2 Constant
Mux Selector
Square Root Setup
Source 1
Setup for All Math Block Types
Eng. Dps
Eng. Low
Eng. High
Eng Units
Fault Action
None
Automatic
Upscale
Downscale
56
1 1
/ and / DIN
4 2
Selects the source for the first input into the multiplexer.
Sets the constant value to be used.
Note. Applicable only if Source 1 is assigned to one of the constants.
Select the source for the second input into the multiplexer.
Sets the constant value to be used.
Note. Applicable only if Source 1 is assigned to one of the constants.
Select the digital signal to be used to switch between the 2 multiplexer inputs.
'0' selects first input (Mux A Src); '1' selects second input (Mux B Src).
Selects the source of the parameter that requires square root to be applied.
Selects the number of decimal places (resolution) displayed for the math block result.
Selects the engineering range low / high value for display purposes and for calculation of the
proportional band.
If the math block result exceeds the Eng High or Eng Low value by more than 10 %, a math
block fail state is set and its output is determined by the Fault Action – see below.
The selected units are displayed in the operator pages – see Appendix C, page 83 for
description of engineering units.
The value returned when the math block fails can be configured.
Failed calculated value is used as math block output.
If the failed calculated output value is below zero the output is driven to the minimum value.
If the failed calculated output value is above zero the output is driven to the maximum value.
If the math block fails, the output is driven to the maximum value.
If the math block fails, the output is driven to the minimum value.
7 Advanced Level
IM/CM/ED–EN Rev. B