Technical data

Fieldbus Communication • 187
ETHERNET
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
4.1.3.3.2 HTTP (Hyper Text Transfer Protocol)
HTTP is a protocol used by WWW (World Wide Web) servers for the for-
warding of hypermedia, texts, images, audio data, 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 con-
troller is used for viewing the HTML pages saved in the coupler/controller.
The HTML pages provide information about the coupler/controller (state, con-
figuration), 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.
4.1.3.3.3 DHCP (Dynamic Host Configuration Protocol)
The coupler’s/controller’s built-in HTML pages provide an option for IP con-
figuration from a DHCP server, a BootP server, or the data stored in its
EEPROM by default.
Note
The network configuration via DHCP is not stored in the EEPROM, this only
occurs when using the BootP protocol.
The DHCP client allows dynamic network configuration of the cou-
pler/controller by setting the following parameters:
Parameter Meaning
IP address of the client Network address of the coupler/controller
IP address of the router If communication is to take place outside of the local network, the
IP address of the routers (gateway) is indicated in this parameter.
Subnet mask The Subnet mask makes the coupler/controller able to differenti-
ate, which parts of the IP address determine the network and
which the network station.
IP addresses of the
DNS servers
Here the IP addresses can be entered by maximally 2 DNS servers.
Lease time Here the maximum duration can be defined, how long the cou-
pler/controller keeps the assigned IP address. The maximum lease
time is 24.8 days. This results from the internal resolution of timer.
Renewing time The Renewing time indicates, starting from when the cou-
pler/controller must worry about the renewal of the leasing time.
Rebinding time The Rebinding time indicates, after which time the cou-
pler/controller must have gotten its new address.