Rockwell-automation 20-COMM-R Remote I/O Adapter Manual de usuario descargar pdf (Pagina 64)

5-6 Using Block Transfer Messaging

20-COMM-R Remote I/O Adapter User Manual

Publication 20COMM-UM004D-EN-P

The following table describes the main events and what a program is

monitoring when performing Block Transfer messaging.

3. Receive data from the program.

After the program with Block Transfer messages has been run, the

results can be seen in a data file. The data file that is used depends on

your controller and application.

Example Programs

The example ladder logic programs (Figure 5.3, Figure 5.4, and Figure 5.6)

can be used to demonstrate how Block Transfer can be used to send Explicit

Messages from a ControlLogix, PLC or SLC controller, respectively. With

these examples, Block Transfer messaging is used to read or write a

parameter value from a PowerFlex 70 drive at Rack 1, Group 0, Slot 0.

These example ladder programs are continuations of the Discrete and Block

Transfer I/O example ladder programs in Chapter

4. The ‘Main Routine’

ladder logic in that chapter performs Jump to Subroutines (JSRs) to these

examples.

Item Event Description

➊

BTW Request Before initiating a Block Transfer message, bit 8 must be 1. This

setting indicates that the adapter and drive are communicating, so

a Block Transfer message will reach the drive.

Before initiating a Block Transfer Write message, bit 9 must be 1.

This setting indicates that a Block Transfer Write can be executed.

➋

BTW Data at

Adapter

Because only one Block Transfer message can be active at a time,

bit 9 is set to 0 when the Block Transfer Write begins. Bit 9 and bit

10 remain at zero while the Block Transfer is being processed.

➌

BTW Complete When the Block Transfer is complete, bit 9 and bit 10 are set to 1.

This setting indicates that the program can perform either a Block

Transfer Read or a Block Transfer Write.

Bit 11 remains at 0 if messaging is successful. If an error occurs, it

would be set to 1.

➍

BTR Request Before initiating a Block Transfer Read message, bit 10 must be set

to 1. This setting indicates that data is available to read. When the

message is executed, bit 9 and bit 10 are set to 0 because only

one Block Transfer can be active at a time.

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 127 128

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