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8315 L&J Tankway Software Description TankGate Interface
26 Installation and Operations Manual
PntCheckSum Parameter
The PntCheckSum is a CRC-16 checksum of the Configuration Parameters of a point.
Most points have the PntCheckSum parameter; a few like the CLK (Clock) Point, DIAG
(Diagnostics) Point, and the register points (BREG, IREG, and DREG) do not. Any time a
Configuration Parameter is changed, the TankGate re-calculates the checksum. The
PntCheckSum is used at initialization to validate each point in the database.
PntStatus Parameter
The PntStatus parameter gives information about point execution. Refer to the
information provided for each Software Block about the particular use of the PntStatus
parameter.
Elapse Parameter
The Elapse parameter usually indicates the time of the last point execution. It is used as
the basis for automatic Change of State notifications.
Value Parameter
The Value parameter indicates the real-time value of the point. In the case of DI points,
the Value represents a Coded value (i.e., On, Off, Opened, Closed, etc.) AI points
represent the Value in an IEEE floating point format. In most cases, the Value parameter
is one of the most important parameters for a point.
Level & Temp Parameters
The Level & Temp parameters indicate the real-time tank level and temperature of the
tank gauge point. There are many Software Blocks available in the TankGate associated
with tank gauge communications, including Software Blocks for every major tank gauge
manufacturer.