Siemens Simantic Net NCM for Industrial Ethernet S7 - Manual (Page 190)

NCM S7 Diagnostics
190
SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
6.6.2 Communication Connections Checklist
Table 6-6 Checklist for Typical Problems with ISO Transport / ISO-on-TCP / UDP Connections
Problem Possible Cause Identifying the Cause and Remedy
No data transfer on an
ISO transport connection
/
ISO-on-TCP connection
or only in one direction. AG-SEND and AG-RECV
are not called in the user
program.
or
Receive or send buffer too
small or incorrect.
Check the user program.
Evaluate status bytes in AG-SEND and
AG-RECV.
What to do:
If necessary, configure FC blocks.
If necessary, correct ANY pointer.
The connection is not
established. Evaluate status bytes of the FC blocks or
evaluate diagnostic buffer.
What to do:
Change the address parameters (MAC/IP
address, TSAP).
Data transfer too slow Receiving device too slow Evaluate diagnostic buffer.
Entry: “No receive resources on destination
station XX”.
What to do:
Delay the send trigger or check the destination
station and optimize reception.
The complete data field
is not sent on an ISO
transport /
ISO-on-TCP/UDP
connection. LEN parameter for
AG-SEND is set to the
wrong value. What to do:
Set the LEN parameter to the required size.
The complete data field
is not sent on an ISO
transport /
ISO-on-TCP/UDP
connection. The buffer specified with
the ANY pointer is too
small. What to do:
Correct the LEN parameter and the ANY pointer.
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