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8315 L&J Tankway Software Description | TankGate Interface |
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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 |
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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”. |
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Description | A description can contain 30 bytes of data and can include any printable |
| ASCII character. |
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ID | Physical Address |
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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 |
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Module | Physical address |
| gauge transmitter. A value of 255 is undefined. |
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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. |
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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. |
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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. |
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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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56 | Installation and Operations Manual |