Siemens ET 7Y Series Especificações descarregar pdf (Página 70)

ET 200S in the PROFIBUS Network

4-12

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

4.5 Direct communication

You can configure the IM 151-7 CPU as an intelligent slave with STEP 7 V5.1 for

direct communication. Direct communication is a special communication

relationship between PROFIBUS-DP nodes.

Principle

Direct communication is characterized by the fact that the PROFIBUS-DP nodes

”listen in” to find out which data a DP slave is sending back to its DP master. Using

this function, the eavesdropper (recipient) can directly access changes to the input

data of remote DP slaves.

During configuration in STEP 7, you set via the relevant I/O input addresses the

address area of the recipient at which the required data of the sender is to be read.

Example

Figure 4-7 gives you an example of the relationships you can configure for direct

communication in STEP 7 with an IM 151-7 CPU. Other DP slaves can only be

senders here.

ET 200S with

IM 151-7 CPU

(intelligent

slave 2)

S7-300

(DP master system 1)

CPU

31x-2

CPU 31x-2

as DP slave

DP slave

S7-300

(DP master system 2)

ET 200S with

IM 151-7 CPU

(intelligent

slave 1)

DP slave

PROFIBUS

Figure 4-7 Direct communication with the IM 151-7 CPU

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Siemens ET 7Y Series Especificações Página 70