Math Block Configuration; Paperless Recorder - ABB ScreenMaster RVG200 Operating Instructions Manual

ScreenMaster RVG200

Paperless recorder

7.13.4 Math block configuration

Maths 1 (to 24)
Block Type
Equation
Reset source
Engineering range
Low
High
Units
Tag
Fault detect level
Fault Detect Direction
136
Select the math block to create or modify.
Fixed as Equation.
Create the equation using the math pad – see Fig. 7.19, page 133.
Select a digital source (for example, alarm signal, real-time event) to be
used to reset the equation if required.
Specify the display range and units of the engineering value.
– maximum and minimum calculated values function:
Example
+
a1 a2
where:

a1 0 to 150 l/s

–
a2 50 to 100 l/s
Engineering 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 maximum).
Refer to Appendix F, page 180 for further information regarding character
use in tags.
Set a tolerance level (between 0 and 100% of the engineering range) to
allow for deviation of the input signal above or below the input span
before an input failure is detected.
– setting the fault detection level to 10% on an input range of 50
Example
to 250 bar causes an analog input failure fault to be detected below 30
bar and above 270 bar.
In the event of a math block failure, the result can be driven upscale or
downscale.
Upscale – math result value driven beyond full scale.
Downscale – math result value driven below zero.
7 Configuration
OI/RVG200-EN