Siemens CP 243-2 Operations Instructions download pdf (Page 12)

12

AS-Interface –

Its main components

Example of an

AS-Interface master:

CPU 343-2 for SIMATIC S7-300

The complete controllers of the

SIMATIC S7 range can also be

used as AS-Interface masters

3.

Master

The AS-Interface master provides the

link to the higher-level controller. It or-

ganises data transmission along the AS-

Interface cable automatically, making

the signals of the sensors and actuators

available to higher-level bus systems,

e.g. PROFIBUS, at an interface. See also

Links.

In addition to polling signals, the master

also transfers parameter settings to the

individual nodes, continuously monitors

the network and performs diagnostics.

Unlike more complex bus systems, AS-

Interface is a self-configuring system.

The user does not have to make any

settings, e.g. access authorisation, data

rates, frame type etc.

The master automatically performs all

the functions required for the correct

functioning of AS-Interface. It also per-

forms self-diagnostics functions. It

recognises faults and automatically as-

signs the correct address to a slave re-

moved for maintenance.

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