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