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SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
Linking to Other Systems with
FETCH/WRITE
The FETCH and WRITE modes supported on ISO transport connections, TCP,
and ISO-on-TCP connections can be used with any other device to access the S7
system memory areas.
To be able to use this type of access, for example for PC applications, you need to
know the PDU structure of the jobs. The required S7 or S5 header for request and
response frames are 16 bytes long and their structure is described in this chapter.
C
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