How do i, Use dde with the server, How to use dde with the server – IDEC WindSRV User Manual
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Result =((Raw_value/32000) * Span_egu) + Lo_egu.
Read Algorithm Variables
Lo_egu - the database block's low engineering value.
Span_egu - the span of the engineering values.
Raw_value - the value stored in the field device's register.
Result - the scaled value stored in the database block.
Write Algorithm
Writes to a 16-bit register using the following algorithm:
Result =(((InputData - Lo_egu)/Span_egu) * 32000) + .5.
Write Algorithm Variables
Lo_egu - the low engineering value.
Span_egu - the span of the engineering values.
InputData - the database block's current value.
Result - the value sent to the process hardware.
How Do I...
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How To... Use DDE with the Server
Using DDE in Your Application
Dynamic Data Exchange (DDE) is a Microsoft communications protocol that provides a method for exchanging data
between applications running on a Windows operating system. The DDE client program opens a channel to the DDE
server application and requests item data using a hierarchy of the Application (Service) name, Topic name and
Item name.
Example 1: Accessing a Register Locally (Using the Default Topic)
Syntax:
Example: MyDDE|_ddedata!Modbus.PLC1.40001
Where:
application: DDE service name
topic: _ddedata (Default topic for all DDE data not using an Alias Map entry)
item: Modbus.PLC1.40001
Example 2: Accessing a Register Locally (Using an Alias Name as a Topic)
Syntax:
Example: MyDDE|ModPLC1!40001
Where:
application: DDE service name
topic: ModPLC1 (Topic now using Alias Map entry)
item: 40001
See Also: