Siemens CP 243-2 Instruções de Operação descarregar pdf (Página 21)

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Addressing of the individual nodes

The addresses of all the slave nodes

must be programmed before AS-Inter-

face is put into operation. You can do

this offline with an addressing device,

online at the master of the AS-Interface

system, or after installation using inte-

grated addressing sockets.

The addresses themselves are the val-

ues 1 to 31 or 1 A/B to 31 A/B with the

extended specification. A new slave that

has not yet been addressed has address

0 A new slave that has not yet been ad-

dressed is assigned the address 0. It is

then recognised by the master as a new

slave that has not yet been addressed,

a state in which it is not yet involved in

normal communication procedures.

The slaves can be assigned any address

– it does not matter whether a slave as-

signed address 21 is followed by slave

28, or whether the first slave is assigned

address 1.

Configuring

As far as AS-Interface is concerned, con-

figuring means nothing more than draw-

ing up a list of the configured slaves and

then storing it in the master. Configur-

ing is usually performed at the master,

which means that the master automat-

ically reads in the network configuration.

(The user can also make settings for

special applications at the PLC).

The slave address and the slave type (ID

code), the I/O configuration (I/O code),

and the parameters (in the case of in-

telligent sensors), if they exist, are de-

fined during configuration. The master

uses this list to check that the configu-

ration programmed matches the actual

configuration. Before this is possible,

the slaves must be addressed.

Addressing unit

for AS-Interface

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