Real Time Automation, Inc.
21
1-800-249-1612
Configuring Write Scan Lines
Follow these steps to manually configure Write Scan Lines.
1)
Select
View Write Scan Lines
if not already selected.
2)
Select a Point Type to configure. Options include: Coil Status and Holding Registers.
Note
:
Holding Registers also have a data type associated with them.
a.
String Point Type- If the mating protocol supports strings, you may select string as a
point type in Modbus. With this point type, 2 characters will be packed into a single
register and the first register will be set aside for the length.
EX: 4x Hold Reg (String) with a Starting Address of 1 for a length of 5 Registers
This means that Register 1 will hold the length of the string and Registers 2-5 will hold
the string contents. This string can contain a max of 8 characters.
3)
Enter a Starting Address (This will be 1 based if
Enable 0-Base Addressing
is unchecked, or 0
based if checked).
4)
Enter the # of consecutive points to write for that point/data type. See the
Scan Line Data Limit
section at the bottom of the webpage for max values in a scan line.
