Math Block Configuration - ABB SM500F User Manual

SM500F
Field mountable paperless recorder

7.13.2 Math Block Configuration

IM/SM500F Rev. Z
Select the Math Block to create or modify – M1 to M8.
Set the equation using the math pad – see Fig. 7.19, page 132.
Note. Digital sources must first be assigned to a valid digital signal – see
below.
Reset Source / Digital Source 1
Set the digital source (e.g. alarm signal, real-time event) used to reset the
equation.
Select the digital signal (e.g. alarm signal, real-time event) used as Digital
Source 1 (md1) within the math block.
Note. When used in a Math Block, an active digital signal has a numerical
value of 1 and an inactive digital signal has a value of 0.
Select the digital sources (e.g. alarm signal, real-time event) used as
Digital Source 2 and 3 (md2 and md3) within the equation.
Specify the display range and units of the engineering value
corresponding to the electrical high and low values, within the limits
defined in Table 7.4, page 97.
– Maximum and minimum calculated values function:
Example

+
a1 a2 , where a1
High = 250.0, Engineering Low = –50.0.
Note. For the best resolution enter engineering ranges to the maximum
permissible number of decimal places.
Enter the tag name to be displayed on channel indicators and used to
identify the channel in archive files. (16 characters max.).
Note. Tags with a high percentage of capital letters and wide characters
such as 'W' or 'M' may appear truncated in some Operator views. In such
cases, use lower case letters or fewer characters.

–
0 to 150 l/s, a2 50
7 Configuration
to 100 l/s, Engineering
133