Siemens CP 243-2 Operations Instructions download pdf (Page 4)

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In the past each individual

sensor had to be wired to

the controller (parallel

wiring). Today, the sensors

and actuators are simply

connected to each other

and to the control via one

cable – the AS-Interface

cable.

1.

AS-Interface with which process and lo-

cal machine, digital and analogue signals

can be transmitted in binary form has

been around since 1994. AS-Interface is

also the universal interface between the

higher control level and simple binary ac-

tuators and sensors.

Field bus technology –

why “go by bus”?

What made us develop AS-Interface?

Not so long ago, the pressure to cut

costs in automation forced structural

changes. This was triggered by the

immense cabling costs that had to be

invested to connect the field level to au-

tomation equipment (usually program-

mable controllers). Every actuator and

every sensor had to be connected to the

control and to a power supply, that in-

volved high material costs (wire costs

money too) and the astronomical cabling

costs already mentioned, whilst at the

same time giving rise to a considerable

source for errors.

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