Siemens SIMATIC TIWAY 1 Spezifikationen PDF herunterladen (Seite 19)

Getting Started

2–4

Getting Started

What can I use as a network master station?

The master stations can be any one of

the following:

S DL430 or DL440 PLCs with a DCM

S DL340 CPU (using built-in port)

S DL240 PLC with a DCM

(A DCM is a Data Communication

Module.)

These master stations use Relay Ladder

Logic Instructions to initiate the

communications requests over the

network. No complex programming (or

knowledge of the DirectNET protocol) is

required.

NOTE: The DL205 DCM was not

available for shipment at the time of this

publication. Availability will be

announced at a later date.

DL405

DCM

DL205

DL340

CPU

DL305

The DCM has no internal program and only processes the data transfer requests

from the master station CPU. The DCM automatically converts the requests into the

appropriate DirectNET commands and issues them to the network.

Read

Write

Data

PLC Requests

Data Tranfer

Data

DCM automatically

converts request to

DirectNET Protocol and

sends it to the network

In a master station.....

issues network

requests

Request

Response

DL405/DL205 PLCs

with a DCM or

DL340 CPU

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 206 207

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