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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.
4.12.1 Parameters
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.