Varec Comprehensive Guide to Gauges and Tank Gauges for Optimal Operations

8315 L&J Tankway Software Description TankGate Interface

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.

4.18.1Parameters

The database parameters used by the LJ1500 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 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.

56 Installation and Operations Manual