Siemens ET 790 Series Informações Técnicas descarregar pdf (Página 252)

Application Examples

System overview

18/4

Siemens ET G1 · 10/2008

Devices

Each device generally comprises a universal

oupling

nit

(BCU) and a task-specific

erminal (BT, e.g. pushbutton or

display), which exchanges information with the BCU over the

eripheral

xternal

nterface (PEI). The BCU receives telegrams

from the bus, decodes them and actuates the BT. Conversely,

the BT sends information to the BCU, which encodes it and

sends it as a telegram onto the bus.

During configuration and commissioning with the ETS the BCU

receives the parameterization data for the function that is to be

performed. For this purpose, the BCU contains a Microprocessor

(MP) with a non-volatile ROM (

ead

nly

emory), a volatile

RAM (

andom

ccess

emory) and a non-volatile EEPROM

(

lectrically

rasable

rogrammable

ROM

The ROM contains the system-specific software that cannot be

changed by the user. The parameterization data for the function

of the BCU to be performed are saved by the ETS in the EEPROM.

The current data are saved by the MP in the RAM.

The assignment of the PEI pins differs on the various BTs.

This ensures that a BT connected through the PEI is able to

communicate error-free with the BCU when the relevant

application program has been loaded by ETS in the EEPROM of

the BCU.

64 64

6464

64 64

I2_05796b

BbC

LC LC

LC LC LC

Functional zone 1

BbC

1.... Bus devices

Line coupler

Backbone coupler

To other systems

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