8300

8315 L&J Tankway Software Description

 

 

4.12 Gateway Block (GWBLK)

The Gateway Block point is used for compatibility with Modbus Master devices. Rather, the user configures a GWBLK to function as a look-up table. The GWBLK point lets the user specify which point references will respond to data addresses in the request from a Host. The GWBLK point contains a cross-reference table for database parameters and data addresses.

4.12.1Parameters

The database parameters used by the GWBLK 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 points indicating the

 

use of the point such as “Modbus Slave” or “Register Value1.” The

 

default tag is set to “GWBLK.00”

 

 

Protocol

Protocol that the GWBLK point is used with. Valid values are

 

Modbus Slave

 

 

ComPort

Bit mask to enable address referencing. If a bit corresponding to

 

the com port, then address referencing is enabled for the channel.

 

The default is 0xFF (all COM ports)

 

 

DataMode

Integer HEX value that controls the data returned to a Modbus Host

 

0: Use parameter values

 

0x01: Convert to Integer

 

0x02: Return 0xFF if the data is invalid.

 

0x04: Convert to Integer using only the Scale

 

If the DataMode is 0x01, the PntRef data will be converted to an

 

integer using the Offset, Scale, ValueMin and ValueMax. If the

 

DataMode is 0x04, the Scale parameter is used to convert to an

 

integer.

 

 

Offset

Input range Offset used for scaling the output to an integer value

 

when DataMode=1.

 

 

Scale

Input range Scale used for scaling the output to an integer value.

 

When DataMode=1.

 

 

ValueMin

Ouptut range Offeet used for scaling the output to an integer value

 

when DataMode=1.

 

 

ValueMax

Output range Scale used for scaling the output to an integer value

 

when DataMode=1.

 

 

CommFailValue

Value to set all of the output registers to when there is a

 

communications or other failure. The CommFailValue works in

 

conjuction with the Filter values. If the PntStatus of the PntRef has

 

bits set that match the Filter, the reference value is declared invalid

 

and the output value will be set to the CommFailValue. This mode

 

is overridden by DataMode = 0x02.

 

 

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Varec 8315 Series manual Gateway Block Gwblk, Parameters