Справочник Пользователя для Varec 8315 Series

8315 L&J Tankway Software Description

TankGate Interface

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Installation and Operations Manual

4.18 L&J MCG1500 Tank Gauge (LJ1500)

The LJ1500 point provides an interface to L & J MCG1500 Tank Gauge 

transmitters. This point provides both level and temperature data. Point and 

gauge status information is also available in this point block.  This point 

executes on the Model 8315 Tank Gauge Interface module.

The database parameters used by the LJ1500 point are listed and described below:

Configuration 

Parameters

Function

Tag

A Tag can contain 15 bytes of data and can include any printable ASCII 

character. Tags can be used to identify the name of the tank being 

monitored The default tag is set to “LJ1500.00”.

Description

A description can contain 30 bytes of data and can include any printable 

ASCII character.

ID

Physical Address (0-127). The default is 0

DevType

Tank Gauge Type. 
DevType = 1 Uses a gray code table for CCW Varec gauges
DevType = 2 Uses a gray code table for CCW S&J gauges
DevType = 3 reports data in feet and hundredths of a foot
DevType = 4 reports data in 32nds of inches

Module

Physical address (1-4) of the Model 8215 used to interface to the tank 

gauge transmitter. A value of 255 is undefined.

Filter

Gauge data filter constant.  The Filter is used when scanning data from 

an L&J gauge.  A buffer is maintained for the last 8 readings.  The Filter 

determines how many of the reading in the buffer are used when 

calculating the Level and Temp parameters.  If all of the level readings 

are within a deadband determined by the LJSCAN LevelDeadband 

parameter, then the Level reading is updated with the latest data.   If a 

large change is detected (data changed more than the LevelDeadband), 

then the Level is not updated until the change between readings is less 

than the LevelDeadband.  The default is 3.

TempDeadband

Change of State temperature deadband value.  This parameter is used 

when the Report is High or Low to determine if a change of state has 

occurred.  This parameter does not affect the Temp parameter value, 

only if it is automatically sent to the Host system.

LevelDeadband

Change of State level deadband value.  This parameter is used when the 

Report is High or Low to determine if a change of state has occurred.  

This parameter does not affect the Level parameter value, only if it is 

automatically sent to the Host system.

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 High.