Siemens CP 243-2 Instrucciones de operaciones descargar pdf (Pagina 32)

32

AS-Interface

and safety

No risks must be taken when it

comes to the safety relevant com-

ponents of manufacturing automa-

tion e.g. emergency stop switches,

light barriers, protective door con-

tacts, safety light grids etc. Unin-

terrupted functional reliability of

all the sensors and actuators

with reliable feedback signals in

the millisecond range have top priority

when it comes to protecting personnel

and equipment from injury and damage.

For many years, these demands meant

considerable additional investments in

automation systems, because the con-

ventional solution for failsafe actuators

and sensors has always been parallel cir-

cuitry.

Safety at work

With the components “

Safety at work

”,

AS-Interface fulfils the requirements for

a safety bus. Safety related and non

safety related digital I/O data can be

transmitted along the same AS-Interface

cable.

How does it all work and can it

really be safe?

Included in the list of AS-Interface com-

ponents already familiar to us (master,

slave, power supply unit …) is the safety

monitor and safety related slaves that

are operated on the same AS-Interface

network.

The master identifies the safety related

slaves in the same way as any other

slave and integrates it in the network

like all conventional slaves.

The transmission protocol and the cable

of the standard AS-Interface are so ro-

bust that they can also be used for

safety related telegrams. The required

safety is achieved by additional signal

transmission between the safe slaves

and the safety monitor. The safety mon-

itor waits for a four bit telegram from

each safety related slave which contin-

uously changes according to a defined

algorithm. If the telegram expected from

a safety related slave does not arrive or

7.

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