Dhcp (Dynamic Host Configuration Protocol); Table 79: Bootp Options - WAGO 750-363/0040-0000 Manual

WAGO-I/O-SYSTEM 750
750-363/0040-0000 FC EtherNet/IP G4 ECO XTR

Table 79: BootP Options

Option
[OPT1] Subnet mask
[OPT2] Time zone
[OPT3] Gateway
[OPT6] DNS server
[OPT12] Host name
[OPT15] Domain name
[OPT42] NTP server
The WBM page "Miscellaneous" can also be used to select the "BootP Request
before static IP" option. To do this, static network parameters must be stored in
the EEPROM on the "TCP/IP" WBM page. After the restart, 5 BootP requests are
sent. If there is no response to any of these requests, the head station configures
itself with the IP parameters stored in the EEPROM.
If the head station does not receive a valid IP address, the I/O LED indicates an
error code (see chapter "Diagnostics").
11.1.2.2

DHCP (Dynamic Host Configuration Protocol)

The Dynamic Host Configuration Protocol (DHCP) allows you to assign an IP
address and other parameters to the head station of a fieldbus node in a TCP/IP
network.
The DHCP protocol can be activated in the WBM on the "TCP/IP" WBM page
(this option is already enabled by default).
DHCP is an advancement of BootP. The difference between BootP and DHCP is
that both use different mapping methods and the configuration is limited in time
with DHCP.
The DHCP client must re-request the configuration at the end of the server-
supplied time ("lease time"). Normally, the DHCP server returns the same
configuration, but it can be changed at any time.
If there is no response from a server on a DHCP request, the request is repeated
continuously: first after 4 seconds, another after 8 seconds, the third after 16
seconds. After that follow more and more requests at longer intervals. If requests
remain without an answer, the network configuration is discarded after the lease
time has expired and a flash code is displayed via the I/O LED. Then the head
station no longer has a valid IP address (IP 0.0.0.0).
There are three different operating modes for a DHCP server:
Meaning
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 host is the unique name of a computer in a
network. The host name can contain up to 32 characters.
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 enabled via the WBM.
Fieldbus Communication 155
Version 1.0.0
Manual