WAGO 750-341 Manual page 123

5.3.4.5 DHCP (Dynamic Host Configuration Protocol)
The coupler's built-in HTML pages provide an option for IP configuration
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 coupler by
setting the following parameters:
Parameter
IP address of the client Network address of the coupler
IP address of the router If communication is to take place outside of the local network,
Subnet mask
IP addresses of the
DNS servers
Lease time
Renewing time
Rebinding time
In the case of configuration of network parameters via the DHCP protocol, the
coupler automatically sends a request to a DHCP server after initialisation. If
there is no response, the request is sent again after 4 seconds, a further one
after 8 seconds and again after 16 seconds. If all requests remain unanswered,
a blink code is output via the "IO" LED. Transfer of the parameters from the
EEPROM is not possible.
Where a lease time is used, the values for the renewing and rebinding time
must also be specified. After the renewing time expires, the coupler attempts
to automatically renew the lease time for its IP address . If this continually
fails up to the rebinding time, the coupler attempts to obtain a new IP address.
The time for the renewing should be about one half of the lease time. The
rebinding time should be about
5.3.4.6 DNS (Domain Name Systems)
The DNS client enables conversion of logical Internet names such as
www.wago.com
separator stops, via a DNS server. Reverse conversion is also possible.
The addresses of the DNS server are configured via BootP, DHCP or web-
based management. Up to 2 DNS servers can be specified. An internal host
table is not supported.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Meaning
the IP address of the routers (gateway) is indicated in this
parameter.
The Subnet mask makes the coupler able to differentiate,
which parts of the IP address determine the network and which
the network station.
Here the IP addresses can be entered by maximally 2 DNS
servers.
Here the maximum duration can be defined, how long the
coupler keeps the assigned IP address. The maximum lease
time is 24.8 days. This results from the internal resolution of
timer.
The Renewing time indicates, starting from when the coupler
must worry about the renewal of the leasing time.
The Rebinding time indicates, after which time the coupler
must have gotten its new address.
7
/ of the lease time..
8
into the appropriate decimal IP address represented with
ETHERNET
Network Communication
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