Siemens NCM S7 Manual De Usuario

224

SIMATIC NET NCM S7 for Industrial Ethernet

Release 6/2003

C79000–G8976–C129–07

Table 7-6

Checklist for Typical Problems with ISO Transport / ISO-on-TCP / UDP Connections

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.

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

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.

-