Varec 8315 Series Scaler Point Scaler, Dynamic Parame Function Ters, Value = Ax + By + Cz + K

Page 60

8315 L&J Tankway Software Description	TankGate Interface

4.15 Scaler Point (SCALER)

The Generic Scaling point allows the user to perform math functions in the TankGate. The SCALER point monitors one or more database reference values and performs an equation in the form:

Value = Ax + By + Cz + K

Note! A, B, C & K are user entered constants.

Note! x, y & z are inputs from other database points.

4.15.1Parameters

The database parameters used by the SCALER point are listed and described below:

Configuration	Function
Parameters

Tag	A Tag can contain 15 bytes of data and can include any printable ASCII
	character. Tags can be used to identify points indicating the use of the
	point such as “Eng Converter” . The default tag is set to “SCALER.00”.

PntRef1	The PntRef parameters determine the input source for the SCALER point
PntRef2	to monitor. Up to three references may be specified. RefValue1 is the X
PntRef3	term, PntRef2 is the Y term, and PntRef3 is the Z term. If a reference is
	not specified, then it is not used in the equation.

A	Constant that is multiplied with RefValue1

B	Constant that is multiplied with RefValue2

C	Constant that is multiplied with RefValue3

K	Constant K

Deadband	Change of State deadband

Report	Causes automatic notification to the Host (in response to a Change of
	State Request) when the Value changes State. Parameter value can be
	High, Low or No. Report=No disables notification. Points with Report =
	High will be sent before points with Report = Low. The default is No.

Maxtime	Specifies the maximum time (in secs) between automatic Change of
	State responses being sent to the Host. Report must be set to either Low
	or High for the Value parameter to be sent in response to a Change of
	State Request. A value of 0 disables this option. Non-zero values cause
	responses to be sent although the value may have not changed since
	the last message. The default is 60.

Dynamic Parame-	Function
ters

Value	Output value for the SCALER point.
	Value = Ax + By + Cz + K.
	x corresponds the RefValue1, y is RefValue2, and z is RefValue3.

50	Installation and Operations Manual

Image 60

Contents Installation Operations Manual Page Copyright Disclaimer of Warranties Safety Precaution Definitions Safety Precautions Installation Using ViewRTUTroubleshooting and maintenance OverviewContents System Information SYS Using ViewRTU Troubleshooting Features VersionsApplications Specifications System Design Power SupplyPower consumption Operating temperatureStorage temperature HumidityMechanical Construction Overview TankGate Interface Hardware Hardware Block Diagram Motherboard DescriptionTankGate motherboard Unit AC Input Power terminal block J2 Field Power Vfield terminal block J3Auxiliary DC Output Power terminal block J8 Surge Protection Surge Gnd terminal block J4AC Power Fuses F1,F2 Field Voltage Selection Jumper W3Switches and Indicators Reset push-button SW3Hard Reset Communications 3.1 COM0 J73.3 COM1 RS232/RS-485 Selection Switch SW2 3.4 COM1 Hardware Handshaking Switch SW13.2 COM1 RS-232/RS-485 J5 Communica Hardware SW2 Set Tion Physical Handshak Ting Layer IngTankGate Communications Cable With RTS / CTS RS-232J68315 L&J Tankway Interface Module Description Model 8315 TankGateID DIP Switch SW1 LED Indicators D1-D6External Power Connector +48V J2 Surge/Shield Ground Connector J4Field Wiring terminal block J3 Connect the field wiring8315 L&J Tankway Interface Module TankGate Interface Software Features Real-Time / Multitasking Executive Automatic Fault RecoveryReal-Time Clock Protocols Data Scanning TaskDatabase Manager System TasksTankGate Software Blocks TankGate 8315 Software BlocksDatabase Organization Point FormatParameter Description Parameter ClassesParameter Data Formats Common ParametersData Format Description PntCheckSum Parameter PntStatus ParameterElapse Parameter Value ParameterGathering Point Data Standard Request-Response FormatChange of State Format Change of State-Related ParametersDeadband Modbus Communications Modbus SlaveFixed Modbus Map Function Code Description CommentsAddress Type Number Parameter Data Type Gwblk method 8315 L&J Tankway Software Description TankGate Interface Data Address Parameter Comments Configuration Parameters Function Clock CLKParameters Dynamic Parameters FunctionConfiguration Function Parameters Communications COMApplication Floating Point Register Fpreg Dynamic Function ParametersReal 4 bytes value Emulator EMU APIByte value indicating status of point Values are Configuration Parame Function Ters Current CommandEMU Gateway Emugw Hex representation of the request sent by the hostDisplays the tank number of the currently selected tank Gauging Systems Inc. Model 2000 Interface GS2000 Last message. The maximum is 255 seconds. The default is Raw2 Gateway Block Gwblk Byte value indicating status of point Values are No error CRC-16 Checksum of points static Configuration ParametersSize Parameter Addr1 is the Data Address and PntRef1 is the correspondingInteger Register Ireg Integer 2 bytes valueModbus Gateway Modgw Current request message, displayed in hex formatCurrent command. Values include Scaler Point Scaler Dynamic Parame Function TersOutput value for the Scaler point Value = Ax + By + Cz + KValue parameter converted to Integer format System Information SYS 17 L&J MCG1000 Tank Gauge LJ1000 PntStatus will be set to indicate the failure Application 18 L&J MCG1500 Tank Gauge LJ1500 Task on the Motherboard determines that the Model 8315 has 8315 L&J Tankway Software Description TankGate Interface 19 L&J MCG2000 Tank Gauge LJ2000 Enables the watchdog task on the Motherboard. The watchdog 8300 Command currently being sent to the gauge Number of gauge polls since last resetNumber of gauge polls which resulted in an error 20 L&J Scanner LjscanOut 8315 L&J Tankway Software Description TankGate Interface General Safety Guidelines Installation Safety GuidelinesInstallation Mounting the TankGate Mounting the TankGate inside the enclosureWiring Up Power Installing CommunicationsMounting the Enclosure Select the Unit addressPower-Up RS-485 CommunicationsInitial system verification Establishing Host CommunicationsInstallation TankGate Interface Installing ViewRTU OverviewSystem Requirements Executing ViewRTUViewRTU Version Selection dialog ViewRTU window ViewRTU Menu BarFile Menu Point Menu Select Point to Add dialog box EditEdit Point selection dialog Edit Point dialog DeletePoint deletion dialog Config Menu Download Database to RTUUpload Database from TankGate To enter the password Creating a PasswordChanging the Password Changing the PasswordPC Setup Communications MenuPort Communications Setup dialog StatusOptions Menu ConnectTankGate search dialog Convert Configuration Files Convert ViewRTU versions dialogExport All Import AllUsing ViewRTU Help MenuConfiguring Single Points Edit Digital Point dialog Edit Point Window Push-buttonsMinimize Minimizing the Edit Point Window ConnectionsNext PreviousTo modify a Value UploadTo modify a value Edit point parameter value dialogConfiguring Multiple Points To modify a ReferenceEdit point parameter reference dialog Adding Multiple PointsSpreadsheet Mode Adding Multiple PointsPoint Menu Edit MenuCopy PastePaste & Dnld Set ValueSet Value with Auto Increment Options Menu ImportExport View Hide Row/ColParameter Type Description Creating and Editing Connections Unhide AllDisplaying the Point Connections window Point Connections WindowTo create a Connection Using ViewRTU TankGate Interface Run indicator Indicator ConditionUsing the TankGate Push-buttons Communications indicatorLED Displays under Abnormal Conditions 1.3 TXD/RXD LEDsPerforming a Hard Reset Press the Reset buttonSet the ID DIP switch to the desired addresses Maintenance Replacing a defective component or moduleTroubleshooting TankGate Interface 102 Ordering Structure Remote Terminal Unit TankGate Ordering Structure Nema 4 EnclosureModbus Map Value12 Fpreg 3034 3094 8300 Your official representative Your offical representative