Siemens SIMATIC NET S7-300 Manual page 192

7 Programming FCs (Functions) and FBs for S7 Ethernet CPs
Status display on the FC call interface; Special case with FC versions (only for
*)
S7 - 300)
With the FCs AG_SEND (FC5) and AG_RECV (FC6), you will receive the codes
shown below in the following situations:
S CP is in STOP;
S Connection is not configured
S Connection is not established
S Connection is aborted;
Codes:
S AG_SEND:
DONE=0; ERROR=1; Status=8183
S AG_RECV:
DONE=0; ERROR=0; Status=8180
or
DONE=0; ERROR=1; Status=8183
*) applies to FCs as of version 4.0
A -192
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H
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S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07