Ref.no.: 003274/Revision 2.4 @2019 Control Data Systems Page 109
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6.3.8
Modbus
The Modbus page enables you to map ISA100.11a attributes to Modbus registers.
Click
Help
in the upper right corner of the window to view information and examples of the accepted
data formats in all the sections.
In the following screen capture (
Figure 6.3.7
) is displayed the Modbus Server window:
Figure 6.3.7 Modbus Server window (ISA 100)
6.3.8.1
Mapping Registers
The mapping area contains two sections listings the two different groups of registers:
Input Registers
and
Holding Registers
.
The mapping between a register and an ISA100.11a attribute is achieved by adding register line in the
appropriate section. Please note that mapping read-only attributes to holding registers will not make the
attributes themselves writable.
Adding a register line
To add a register line, you must perform the following actions:
