Siemens SIMATIC S7 - Open User Communication Library Example

Libraries
9.4 Open user communication library
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
525
Error code
Description
C
O
N
N
E
C
T
S
E
N
D
R
E
C
V
D
I
S
C
O
N
N
E
C
T
17 No connection resource is available. All connections of
the requested type (active/passive) are in use.
X
18 The local or remote port number is reserved or the port
number is already in use for another server (passive)
connection.
X
19 One of the following IP address errors have occurred:
• The IP address is invalid (for example, address
0.0.0.0).
• This IP address is the IP address of this CPU.
• This CPU has IP address 0.0.0.0.
• The IP address is a broadcast or multicast address.
X
20 A local or remote TSAP error (ISO-on-TCP only) X
21
An invalid connection ID (65535 is reserved)
X
24 There is no operation pending so there is no status to
report.
X X
25 The receive buffer is too small: The CPU received more
bytes than the buffer length supports. The CPU discards
the extra bytes.
X
31 Unknown error. Disconnect and reconnect to fix the prob-
lem.
X X X X
9.4.4
Open user communication library example
Note
The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s have no
Ethernet port and do not support any functions related to the use of Ethernet
communications.