Siemens CP 243-2 Instruções de Operação descarregar pdf (Página 19)

AS-Interface

in practice

Beginner’s checklist

Here is a checklist of 10 points for the beginner, to make entry into the world

of AS-Interface even easier:

AS-Interface has not only become a standard industrial interface for connecting simple

binary devices. The claim of “easy entry without special bus know-how” is not exag-

gerated. On the contrary: The superiority of AS-Interface lies in its simplicity.

How many inputs and outputs are needed?

The number of inputs and outputs tells you how many AS-Interface net-

works you need.

How much power do the I/Os consume?

The total power requirement of the required modules determines which AS

interface power supply unit you need. As it is not possible to connect power

supply units in parallel, a power supply unit sized to the power requirement

must be used.

Are special cables required?

Any combination of profiled and round cables is possible. External conditions

determine whether rubber, TPE or PUR cables have to be used. Repeaters

or extenders (See Page 16) have to be used for cable lengths above 100m.

Is address assignment correct?

For clarity’s sake, a plan should be drawn up, clearly showing which

addresses are assigned to which slaves. Double assignments are not

necessarily recognised as errors by the master.

Which modules belong to which addresses?

Modules and slaves that are addressed should be labelled clearly.

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Siemens CP 243-2 Instruções de Operação Página 19