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6-2 Using the Parameter Messaging
There are five basic events in the Parameter Data Exchange process
defined below. The details of each step will vary depending on the
controller. Refer to the documentation for your controller.
Important: There must be a request message and an response message
for all Parameter Data, whether you are reading or writing a
data.
Figure 6.1 Parameter Data Exchange Process
Running the Parameter Messaging
Event Description
➊
You format the required data and set up the ladder logic program to send a
Parameter Data Exchange request to the scanner module (download).
➋
The scanner module transmits the Parameter Data Exchange Request to the
slave device over the Profibus network.
➌
The slave device transmits the Parameter Data Exchange Response back to
the scanner. The data is stored in the scanner buffer.
➍
The controller retrieves the Parameter Data Exchange Response from the
scanner buffer.
➎
The Parameter Data Exchange is complete.
➊
➍
➎
➋
➌
Set up and send
Parameter Data
Complete Parameter
Data Exchange
Retreive Parameter
Data Exchange
Response