Siemens S7 Bedienungsanleitung PDF herunterladen (Seite 116)

Configuring Communication Connections

116

SIMATIC NET NCM S7 for Industrial Ethernet

C79000-G8976-C129–06

4.5.3 ISO-on-TCP with the FETCH/WRITE Mode

Using FETCH PASSIVE / WRITE PASSIVE

If you select one of the FETCH PASSIVE or WRITE PASSIVE modes for the

ISO-on-TCP connection, you can access the system areas on a SIMATIC S7 PLC

from a SIMATIC S5 station or other non-S7 station.

Figure 4-16

The connection can then only be used for this mode; sending or receiving with the

FCs AG_SEND/AG_LSEND or AG_RECV/AG_LRECV is then no longer possible.

The connection establishment is passive; in other words, only the partner station

(SIMATIC S5 station or other non-S7 station) can establish the connection. The

setting is made automatically in the “General” tab and cannot be changed.

S FETCH

If you select the FETCH mode, you allow direct read access to system memory

on the SIMATIC S7 PLC. Such access can be, for example, from a SIMATIC

S5 station or other station.

S WRITE

If you select the WRITE mode, you allow direct write access to system memory

on the SIMATIC S7 PLC. Such access can be, for example, from a SIMATIC

S5 station or other station.

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Siemens S7 Bedienungsanleitung Seite 116