Siemens CP 243-2 Operations Instructions download pdf (Page 7)

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networked, or a host computer controls

production as a whole using the com-

puters as slaves. The data volume is in

the megabyte range and transmission

of the data does not need to be in real

time. The transmission medium might

be Ethernet.

Field or process control level

At the field and process level,

PROFIBUS® (process field bus) has be-

come standard. With a transmission rate

of up to 12 Mbits/s in its DP version, it is

ideal for the high demands of automa-

tion technology. PROFIBUS is now avail-

able as PROFIBUS-PA for process con-

trol, and the extensions added in 1999

for synchronism and peer-to-peer traffic

will make it suitable for use in typical

motion control applications in the future.

Actuator/sensor level

The actuator sensor level is the lowest

level in the field area. Here, binary actu-

ators and sensors in the field and

process area are networked. Many of

the devices connected, supply or re-

quire binary signals (e.g. BERO®; con-

tactors, motor starter, solenoid valves,

pneumatics, valve islands etc.). The nec-

essary data volume is small, but the

speed of data transmission is very high.

A typical application for AS-Interface.

AS-Interface has had an excellent track

record in more than two million nodes

since its introduction and has proven the

most low-cost, robust, and best suited

solution for the task, almost without

competition.

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