Varec 8315 Series manual Gateway Block Gwblk, Parameters

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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