VR Series Math, Counter & Totalization
Math Option (Extended software & Math functions were made standard August 2009)
The VR Series Math function provides 18 Derived channels. These Derived channels may be assigned as Math [see below],
Counter and/or for Totalization. The VR18 offers Timer function is also described below.
The Math option allows for equations to be used to produce a Derived Variable by using measured data or computed as the
variable(s); math on math is allowed as well as math on analog channels or other derived variables.
The result of Math can be displayed and stored.
The Math expression / equation that can be keyed has a maximum 36 characters.
VR Series Configuration, with exception of Math, is described in VR Series Configuration.htm page.
When a VR18 is ordered with optional Math function it is available in the Channel configuration screens.
As reference with the bottom access door open [bottom soft buttons appear] press the Configuration button shown on bottom of Page display; Page display can be one of 6 screens - sample screen below is "Page 1" and has mode display of "mix", a combination of trend, bar graph & digital displays.
Once timed out and the bottom access door closed the display automatically expands to both the left & bottom to fill space vacated by the soft keys.
Then for Math configuration press the Channel Button to enter the Channel Configuration mode;
Note: to configure the Timer [standard on all VR Series's], Counter & Totalizer functions the Tool Button will be depressed.
The Channel screen initially shown will be an Analog input - Press Math key to select the Mathematics input.
Except for Expression, it is similar to setting up Analog channels described in VR Series Configuration.htm.
Define the name, Description, and select Type, Log Method, Log Speed, Unit, Scale Low, Scale High, and Event.
Enter Expression column, columns appear for selection of Source, Operator and a Keyboard.
Use Source, Operator and keyboard to define the Math equation.
Press directional keys < > at the bottom to select from 1 to 18 available Math channels.
Press Back key to memorize the Math settings.
Math Equations available for the Expression Field
With the Math option the following Math functions are available in the Channel mode configuration in the Expression Field.
Mathematics Functions + Addition - Subtraction * Multiplication / Division SIN (x) sin (x) COS (x) cos (x) EXP (x) e^{x} SQRT (x) Square root of x LN (x) log_{e} (x) TG (x) tan (x) CTG (x) 1/tan (x) ASIN (x) Sin^{-1} (x) ACOS (x) Cos^{-1} (x) ATG (x) Tan^{-1} (x) LOG (x) log_{10} (x) ABS (x) Absolute of x SQ (x) x^{2} ROUND (x) The closest integral number to x HI (x,y) The bigger value between x and y LO (x,y) The smaller value between x and y INV (x) 1/x PCT (x,Hi,Lo) PCT % = x / Hi-Lo, x: Target Value, Hi: High Value, Lo: Low Value x%y Remainder of x/y x^y x^{y} POW (x,y) x^{y}
Math Expressions
Press Back key, to return to the beginning of Configuration mode. Select Tools, then press Enter key to get into Tools mode. Timer, Counter and Totalizer are defined here.
Counter and Totalizer are available only if the optional Math module was ordered.
Press directional keys < > at the bottom to select from 1 to 6 available timers.
Repeat Countdown: Repeats the previous countdown.
Job1, Job2: various jobs as described in 4.1 Channel, 2 jobs for each timer.
Press Back key, to return to the beginning of Configuration mode. Select Tools, then press Enter key to get into Tools mode. Timer, Counter and Totalizer are defined here.
Press directional keys < > at the bottom to select one it from 1 to 6 available counters.
Name: Defines the name of counter.
Desc: Defines the description for a specific counter on the display.
Unit: Defines the unit of counter
Preset: Defines the preset value for the counter. The counter starts from a preset value.
Event: Defines the type, setpoint, Job1 or Job2
Type: Select one of three options: None, Process Hi, Process Low
Setpoint: Defines the set point of process value to trigger the counter.
Job1, Job2: various jobs as described in 4.1 Channel, 2 jobs for each counter
Press Back key, to return to the beginning of Configuration mode. Select Tools, then press Enter key to get into Tools mode. Timer, Counter and Totalizer are defined here.
Counter and Totalizer are available only if the optional Math module was ordered.
Press directional keys < > at the bottom to select from 18 available totalizers
Name: Defines the name of the totalizer.
Desc: Defines the description for a specific totalizer on the display.
Source: Select a specific analog input or Math input to be used for totalizing.
Action: Disables or enables the totalizer.
Decimal: Defines the decimal point for the totalizer.
Period: Selects second, minute or hour used for the totalizer.
Unit: Defines the unit of totalizing
Preset: Defines the preset value for the totalizer. The totalizer starts from a preset value.
Event: Defines the type, setpoint, Job1 or Job2.
Type: Select one of three options: None, Process Hi, Process Low
Setpoint: Defines the set point of process value to trigger the totalizer. Job1, Job2: various jobs as described in instruction manual 4.1 Channel, 2 jobs for each totalizer.
Refer to the instruction manual for examples of Totalizer: VR18_Manual_v2.37_November -2011.pdf
Reports for Counter & Totalizer
Shown below are sample reporting screens
Field Installation of Math Option
It is best to specify the Math Option at time of order. To add the optional Math module (includes Counter & Totalizer features) in the field it is necessary to order a Boot ROM Chip that enables this option.
Refer to VR18 Technical Support Documentation.htm and specifically VR18-Chip Replacement DOC - Boot ROM-A.pdf [152KB] for instructions on how to change chip sets in the field.
VR18_Brochure_v2.37_November-2011.pdf
VR18_Manual_V2.37_November-2011.pdf
VR06_Brochure_v2.37_November-2011.pdf
VR06_Manual_V2.37_November-2011.pdf
VR Series_NEMA_4_Brochure_Feb-2007.pdf
VR06-18 Guidelines 21CFR part 11.pdf
VR06-18: Series FAQ's.pdf [40KB]
VR06-18: Series 2-Year Warranty Statement.pdf [13KB]
VR06-18: Firmware Update Sheet.pdf
VR06-18: CF Card Memory Calculations.zip
VR06-18: Reset to Factory Default
Return To:
VR06-18: Recorder Home Page.htm
VR06-18: Sample Screen Display & Operational Review.htm
VR06-18: Event & Alarm Description.htm
VR06-18: Installation: Panel or Bench Top Mounting.htm
VR06-18: Special Features: Math, Totalize, etc.htm
VR06-18: Observer Software Review.htm
VR06-18: Technical Support Documentation.htm
VR06-18: Download Firmware and Observer Software.htm
VR06-18: Security; CFR21 Part 11 Features.htm