WAGO-I/O-SYSTEM 750
Fieldbus Communication 213
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
Table 83: Meaning of DHCP options
Option
Meaning
[OPT1] Subnet mask
32-bit address mask that displays which bits of the IP address
identify the network and which identify the network stations.
[OPT2] Time zone
Time difference between the local time and the UTC (Universal
Time Coordinated).
[OPT3] Gateway
IP address of the router that permits access to other networks.
[OPT6] DNS server
IP address of the name servers that converts a name into an IP
address. Up to 2 DNS servers can be configured.
[OPT15] Domain name *
)
The name of the domain is the unique name of a network. The
domain name can contain up to 32 characters.
[OPT42] NTP server
IP address of the Network Time Server. When assigning an NTP
server, the SNTP client is automatically enabled in the coupler.
[OPT51] Lease time
The maximum duration (i.e., how long the fieldbus
coupler/controller maintains the assigned IP address) can be
defined here. The maximum lease time for the fieldbus controller
is 48 days. This is due to the internal timer resolution.
[OPT58] Renewing time
The renewing time indicates when the fieldbus coupler/controller
must renew the lease time. The renewing time should be
approximately half of the lease time.
[OPT59] Rebinding time
The rebinding time indicates after what amount of time the
fieldbus coupler/controller must have received its new address.
The rebinding time should be approximately 7/8 of the lease
time.
*
)
In contrast to BootP, the DHCP client does not support assignment of the host name.
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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.
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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.
