Communication
11.2 PROFINET
S7-1200 Programmable controller
894 System Manual, V4.2, 09/2016, A5E02486680-AK
Return val-
ue
STATUS*
(W#16#...):
8502 Command unknown or not imple-
mented
Check your entries, in particular the FROM
parameter. It may be incomplete and you may
have forgotten the "@" or "." (see also: TO_S
and CC parameters (Page 891)).
8535 SMTP authentication incomplete You have possibly entered an incorrect user
name or incorrect password.
8550 Mail server cannot be reached. You
have no access rights.
You may have entered an incorrect user name
or password, or the mail server may not sup-
port your login. Another cause of error could
be a mistake in the domain name after the "@"
at the TO_S or CC parameter (see also: TO_S
and CC parameters (Page 891)).
8552 Action aborted: Assigned memory
Try again later.
* You can display error codes as integer or hexadecimal values in the program editor.
UDP is a standard protocol described by RFC 768: User Datagram Protocol. UDP provides a
mechanism for one application to send a datagram to another; however, delivery of data is
not guaranteed. This protocol has the following features:
● A quick communications protocol
● Suitable for small-sized to medium data amounts (up to 1472 bytes)
● UDP is a simpler transport control protocol than TCP, with a thin layer that yields low
overheads
● Can be used very flexibly with many third-party systems
● Routing-capable
● Uses port numbers to direct the datagrams
● Messages are unacknowledged: The application is required to take responsibility for error
recovery and security
● Programming effort is required for data management due to the SEND / RECEIVE
programming interface
UDP supports broadcast communication. To use broadcast, you must configure the IP
address portion of the ADDR configuration. For example: A CPU with an IP address of
192.168.2.10 and subnet mask of 255.255.255.0 would use a broadcast address of
192.168.2.255.
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