Siemens CP 243-2 Instrucciones de operaciones descargar pdf (Pagina 13)

13

Slave

The most important component of the

whole AS-Interface system is so small

that would fit comfortably on a fingernail.

But without it, AS-Interface would never

have become as important as it is today.

We’re talking about the AS-Interface slave

chip. Slaves are actually distributed I/O

modules of the programmable controller

(PLC).

AS-Interface modules recognise the data

bits transmitted by the master and re-

turns their own data. Up to 4 binary sen-

sors and actuators can be connected to

any one standard AS-Interface module.

An intelligent slave is one where the AS-

Interface chip is integrated into the sen-

sor or actuator. Costs for electronics are

minimal.

AS-Interface slaves are available as digi-

tal, analogue, and pneumatic modules,

and as intelligent nodes, e.g. motor

starters, LED columns or membrane key-

boards. Single-acting and double-acting

pneumatic cylinders can be controlled

with pneumatic modules. That means not

only savings in cabling, but in tubing, too!

Links

In more complex automation structures,

AS-Interface can also be connected to a

higher level field bus, e.g. PROFIBUS. For

this, it requires a gateway (e.g. DP/AS-i

link) which is used as an AS-Interface

master in the AS-Interface network but

which functions as a slave in the higher

level field bus (e.g. PROFIBUS). In such a

configuration, AS-Interface is the supplier

of binary signals to any higher level field

bus system.

Up to four binary

sensors and

actuators can be

connected to a

standard AS-

Interface module.

Decentralised start-

up of a DC motor:

No problem with

the DC starter

module and

AS-Interface

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