Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 9)

Overview of an SPI Communication Network

Chapter 1

1-3

When you program the processor to communicate with devices on the SPI

network via the SPI module, you must follow a strict procedure of data

transfers that:

receives status from the SPI module

configures the SPI module with module-specific configuration (MCC)

configures the SPI module with device-specific configuration (CCB)

receives configuration status from the SPI module (SYS and CCS)

sends commands to the SPI module destined for target devices (CDB)

receives status from target devices via the SPI module (CDS)

We show the general flow of configuration and command data transferred to

the SPI module, and status received from it. Once configured, the SPI

module serves as the master interface with slave devices on the link: the

module parces commands to target devices and polls status from them.

Transferring

Configuration and Command Data

to One of Three Devices on an SPI Network

Data T

able

Config CCB ID#20

Config CCB ID#21

Config CCB ID#22

Status CCS ID#20

Status CCS ID#21

Status CCS ID#22

BTW Buf

fer

BTR Buf

fer

Config CCB ID#20

SYS

SPI Module

Data CDB ID#20

Data CDB ID#21

Data CCB ID#22

Status CDS ID#20

Status CDS ID#21

Status CDS ID#22

MCC

SYS

Status CCS ID#20

Data CDB ID#20

MCC

Device

ID#20

Parces

Commands

Polls

Status

Status CDS ID#20

SPI Link

Overview of the Data

ransfer Scheme

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 61 62

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