Rockwell-automation 20-COMM-R Remote I/O Adapter Manual de usuario descargar pdf (Pagina 37)

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

Publication 20COMM-UM004D-EN-P

Chapter 4

Using Discrete and Block Transfer I/O

This chapter provides information and examples about using I/O to control

a connected PowerFlex drive.

About I/O

I/O is used to transfer the data which can control the PowerFlex drive and its

speed. It is also used for transmitting data through Datalinks.

The Remote I/O adapter uses Discrete I/O and Block Transfer I/O to

transfer I/O data. The ‘Discrete I/O’ is either 1/4 rack (two 16-bit words) or

1/2 rack (four 16-bit words). The rack size is set using Configuration DIP

Switch SW4 or, if the hardware switches have been disabled, adapter

Parameter 27 - [Rack Size]. The ‘Block Transfer I/O’ includes all Block

Transfer Read or Block Transfer Write messages that are 18 words or fewer.

The type of I/O that is transmitted between the drive and controller is set in

Parameter 12 - [DPI I/O Cfg]. When you set up your I/O, note the

following:

• The Logic Command/Status is always transmitted in the discrete I/O.

• The Reference is transmitted in the Discrete I/O if you are using a 1/2

rack, or in the Block Transfer I/O if you are using a 1/4 rack.

• Datalinks are always transmitted in the Block Transfer I/O.

Topic Page

About I/O

4-1

Understanding the I/O Image

4-2

Discrete I/O Image

4-4

Block Transfer I/O Image

4-7

Example Ladder Logic Program Information

4-11

ControlLogix Controller Example

4-12

PLC-5 Controller Example

4-15

SLC 500 Controller Examples

4-17

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Rockwell-automation 20-COMM-R Remote I/O Adapter Manual de usuario Pagina 37