Varec TankGate Interface 8315 Series User Manual

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.