WAGO-I/O-SYSTEM 750 XTR Fieldbus Communication 147
750-352/040-000 FC ETHERNET G3 XTR
Manual
Version 1.3.0
DHCP server.
If the address was assigned from this range once to a DHCP client, then it
belongs to the client for an indefinite period as the assigned IP address is
also bound to the MAC address.
• Dynamic assignment
This process is similar to automatic assignment, but the DHCP server has a
statement in its configuration file that specifies how long a certain IP
address may be “leased” to a client before the client must log into the
server again and request an “extension”.
If the client does not log in, the address is released and can be reassigned
to another (or the same) client. The time defined by the administrator is
called Lease Time.
Some DHCP servers also assign IP addresses based on the MAC address,
i.e., a client receives the same IP address as before after longer network
absence and elapse of the Lease Time (unless the IP address has been
assigned otherwise in the mean time).
DHCP is used to dynamically configure the network parameters.
The ETHERNET TCP/IP fieldbus coupler/controller has a DHCP client that
supports the following options in addition to the default “IP address” option:
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Table 64: Meaning of DHCP Options
32-bit address mask that displays which bits of the IP address
identify the network and which identify the network stations.
Time difference between the local time and the UTC (Universal
Time Coordinated).
IP address of the router that permits access to other networks.
IP address of the name servers that converts a name into an IP
address. Up to 2 DNS servers can be configured.
The name of the domain is the unique name of a network. The
domain name can contain up to 32 characters.
IP address of the Network Time Server. This address is only
accepted if the protocol "SNTP" is activated via the WBM.
The maximum duration in seconds (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.
The minimum lease time is 16 minutes.
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.
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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