InduSoft Web Studio - InduSoft Corporation

InduSoft Web Studio
Tutorial training – Revision B – Sep/10/2000
© Copyright InduSoft Ltd. 2000
In our example case, let’s use the MODBUS Syntax.
The syntax here is: :. It means, you first type the reference you wish
to communicate on this sheet, type the colon (“ : “), and then the initial address.
For example, if the header is 4X:1, the sheet will read from the 4000001 until the highest offset
configured on the Address column.
The references allowed are:
0X: Coil Status
1X: Input Status (read only)
3X: Input Register (read only)
4X: Holding Register
ID: Report Slave (read only)
There’s no limit to the initial address.
Take care with the limits of the addresses. For example, if on the PLC there’s no 30500. The
“Header” field accepts the syntax “3X:500”, but the runtime won’t find this register.
Where is indicated “Read Only”, the write functions won’t work. It’s not safe let write on the
Input Status, Input Registers and the Report Slave functions.
This field can also be filled with a tag between curly brackets (For example: {tag}).
?NOTE: Such as the Station field, the TAG placed between the curly brackets, cannot have its
existence tested. It means, if a TAG is typed that has not been created yet on the Application
Database, or in a different form then the other fields, it won't be opened the dialog window with
the question regarding its creation. In other words, if you type an uncreated tag, the system won't
work properly.
When creating a new driver sheet, this field starts blank. Once you place the mouse's cursor on it,
even you try to let it blank again, the standard string “0X:1” will take place on it. From then on, it
won't be possible leave it blank again. But it's possible to changing its value to another valid
header.
Min / Max
These fields are only enabled if the check box to the left is selected. When selected, it enables a
range of values that can be converted into an engineering format. These fields determine the
minimum and maximum range of values. Ex.: memory holds values from 0 to 4095 meaning 0%
to 100% in the user interface. This setting takes effect for all tags in the worksheet. In this
example, the tag parameters min and max must be set 0 to 100
12.1.4.2 Body
The Driver Configuration's body assigns the PLC's memory address to the declared tags, and also
handles the engineering units.
It has 4 columns: Tag Name, Address, Add and Div.
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