Siemens SIMATIC TIWAY 1 Especificaciones Pagina 23

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Getting Started
2–8
Getting Started
Choosing a Configuration
The network components can be used to create many different network designs.
However, all networks use a mixture of three basic configurations. Any of the three
configurations can be grouped together or used independently. The type of
configuration determines the types of cables, communication parameters, and
communications programming.
This configuration is very easy to use. A
PLC master / slave configuration utilizes
a DirectLOGICE PLC as the network
master. A small communications
program and a communications
interface (DCM) is required in the master
station. Slave stations can have built-in
DirectNET ports, or, they can have
communication interfaces.
Master
Slaves
DCM
Built-in port
DCM
A host computer, operator interface, or
other intelligent device can be connected
to one or more slave stations. The master
must contain a program (or driver)
capable of issuing network requests
using the DirectNET protocol.
Slave stations can have built-in
DirectNET ports, or, they can have
communication interfaces (DCMs or
DCUs).
Master
Slaves
Built-in port DCM
Two DL405 PLCs with DCMs as the
network interface can be connected so
either station can initiate a request for
data. Both stations must contain a
communications program to initiate the
requests for data.
This configuration can only be achieved
by using DCMs. No other stations can be
connected in this manner.
Peer Master Peer Master
DCM DCM
S Up to 90 slave stations can be connected to a single master.
S Only one master is allowed for each portion of the network.
S A single base can have multiple masters, with each master
communicating to its own slave stations.
Three Basic
Configurations
PLC as Master
Host as Master
Peer as Master
Configuration
Limits
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