Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 250)

100

101

Preface

MicroLogix 1000 Programmable Controller User Manual

13–2

Types of Communication

Communication

is the ability of a device to send data or status to other devices.

This capability typically falls into one of two categories: initiator (master) or

responder (slave). Each of these are described below:

Initiator (Master) Communication

Initiator

products can begin communication processes, which includes requesting

information from other devices (reading) or sending information to other products

(writing). In addition, initiator products are usually capable of replying to other

devices when they make requests to read information. The Series C or later

MicroLogix 1000 discrete controllers and all MicroLogix 1000 analog controllers

are in this class.

Initiator products can begin communication processes with other initiator products

(peer-to-peer communication) or with responder (slave) products

(initiator-to-responder communication).

Responder (Slave) Communication

Responder products can only reply to other products. These devices are not capable

of initiating an exchange of data; they only reply to requests made from initiator

products. The Series A and B MicroLogix 1000 discrete controllers are in this class.

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