E2 User's Manual Supplement: Flexible Combiner ... - icemeister.net

to 1 hour (3600 seconds). Use this format forminute/seconds by entering “00” for the hour(example: “00:30:00” for 30 minutes).• As a time of day in HH:MMx, where x is “a” if thetime is a.m. or “p” if the time is p.m. This is convertedto a number of seconds after midnight.Example: 04:00a is converted to 14400 seconds.In all cases, time constants are all converted to a numberof seconds when used by the Flex Combiner, so thatmathematical operations like “00:01:00*2” results in 120(60 seconds multiplied by 2).In the case of a time constant in HH:MMx format, thiscan be used along with the TIME() function to do comparisonsbetween the current time and the setpoint. For example,IF((TIME()>06:00p)=TRUE,60,50) compares thecurrent TIME, which returns the time in a number of secondssince midnight, to 06:00p, which is converted to21600 seconds.EXAMPLE EQUATIONS: INPUTS ANDCONSTANTSEquationDescriptionAI4+60 The value of AI4 plus 60.(PI*(10M^2))*AI2AI1+(3DDF*DI2)Assuming AI2 is a linearsensor whose output reflectsa water level position inmeters, this equation calculatesthe volume of a cylindricaltank whose radius is10 meters. The constant PI ismultiplied by the radiussquared (10M^2) to yield thecircular area of the tank, andthis value is multiplied withAI2 to yield volume.Assuming AI1 is a temperaturesensor, this equationadds three degrees Fahrenheitto the value of AI1 whenDI2 is ON. Because ON isequal to 1.0, then 3DDF *1.0= 3DDF. When DI2 is OFF(0.0), the expression 3DDF *0.0 = 0DDFTable 2-6 - Equation Examples: Inputs Using Constants2-4 • E2 User’s Manual Supplement: Flexible Combiner 026-1620 Rev 0 09-15-05