Maximum And Minimum Value; Real Time Average - ABB C1300 User Manual Supplement

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...2 MATH CONFIGURATION

2.1.4 Maximum and Minimum Value – Fig. 2.1

If the High Value function is selected the math result holds the

value measured on an input variable. If the Low Value function

maximum

is selected the math result holds the

value measured on an input variable. The math result can be reset to its current value by

minimum

an internal or external digital signal.

Fig. 2.1 shows the process variable from a flow meter that is varying continually with time. The maximum and minimum values are the

highest and the lowest samples taken since an external reset last occurred. The external reset can be independent of the average reset

signal.

The real time average function averages a continually varying input over a set time scale, between 1 and 1440 minutes

(24 hours). Any process variable, remote set point or other math block result can be averaged. The math result can be reset to its

current value by an internal or external signal.

Fig. 2.1 shows the process variable from a flow meter that is varying continually with time. At 0 minutes an external digital input signal

resets the average to the current value measured. The process variable is then sampled for 10 minutes. The average function result is

the average value of the process variable over the 10 minutes sampled.

Fig. 2.1 Example of Average, Maximum and Minimum Functions

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