8300

8315 L&J Tankway Software Description

 

 

4.19 L&J MCG2000 Tank Gauge (LJ2000)

The LJ2000 point provides an interface to L & J MCG2000 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.

4.19.1Parameters

The database parameters used by the LJ2000 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 “LJ2000.00”.

 

 

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 8315 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.

 

 

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Varec 8315 Series manual 19 L&J MCG2000 Tank Gauge LJ2000, Parameters