Http (Hypertext Transfer Protocol); Dns (Domain Name Systems); Sntp-Client (Simple Network Time Protocol); Table 82: Meaning Of The Sntp Parameters - WAGO -I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-882 Media Redundancy ETHERNET Controller
12.1.2.3

HTTP (Hypertext Transfer Protocol)

HTTP is a protocol used by WWW (World Wide Web) servers for the forwarding
of hypermedia, texts, images, audiodata, etc.
Today, HTTP forms the basis of the Internet and is also based on requests and
responses in the same way as the BootP protocol.
The HTTP server implemented in the (programmable) fieldbus coupler or
controller is used for viewing the HTML pages saved in the coupler/controller.
The HTML pages provide information about the coupler/controller (state,
configuration), the network and the process image.
On some HTML pages, (programmable) fieldbus coupler or controller settings
can also be defined and altered via the web-based management system (e.g.
whether IP configuration of the coupler/controller is to be performed via the
DHCP protocol, the BootP protocol or from the data stored in the EEPROM).
The HTTP server uses port number 80.
12.1.2.4

DNS (Domain Name Systems)

The DNS client enables conversion of logical Internet names such as
www.wago.com into the appropriate decimal IP address represented with
separator stops, via a DNS server. Reverse conversion is also possible.
The addresses of the DNS server are configured via DHCP, BootP or web-based
management. Up to 2 DNS servers can be specified. The host identification can
be achieved with two functions; an internal host table is not supported.
12.1.2.5

SNTP-Client (Simple Network Time Protocol)

The SNTP client is used for synchronization of the time of day between a time
server (NTP and SNTP server Version 3 and 4 are supported) and the internal
system time in the (programmable) fieldbus coupler or controller. The protocol is
executed via a UDP port. Only unicast addressing is supported.
Configuration of the SNTP client
The configuration of the SNTP client is performed via the web-based
management system. The following parameters must be set:

Table 82: Meaning of the SNTP Parameters

Parameter
WBM page "TCP/IP"  "(S)NTP
Server"
WBM page "TCP/IP"  „SNTP
Update Time (sec,
max. 65535) "
Meaning
The address assignment can be made over an IP address.
The update time indicates the interval in seconds, in which the
synchronization with the time server is to take place.
Fieldbus Communication 219
Manual
1.5.0