Rockwell-automation 20-COMM-I Interbus Adapter Uživatelský manuál stáhnout pdf (Strana 64)

6-2 Using Explicit Messaging (PCP Communications)

There are five basic events in the Explicit Messaging 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 a response message

for all Explicit Messages, whether you are reading or

writing data.

Figure 6.1 Explicit Message Process

Event

1. Format the required data and set up the ladder logic program to send

an Explicit Message request to the scanner module (download).

2. The scanner module transmits the Explicit Message Request to the

slave device over the Interbus network.

3. The slave device transmits the Explicit Message Response back to

the master.

4. The controller retrieves the Explicit Message Response.

5. The Explicit Message is complete.

Running Explicit Messages

➊

➍

➎

Retrieve Parameter

Message Response

Complete Parameter

Message

PWR

STS

PORT

MOD

NET A

NET B

➋

➌

Set up and send

Parameter Message

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Rockwell-automation 20-COMM-I Interbus Adapter Uživatelský manuál Strana 64