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8315 L&J Tankway Software Description TankGate Interface
56 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.
4.18.1 Parameters
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.