Publication 1766-RM001A-EN-P - October 2008
626 Protocol Configuration
Subnet Mask 0…255 in each field.
Used by the processor to interpret IP addresses when the Internet is divided into subnets. The subnet
mask must be specified. You can do this either manually or by enabling BOOTP or DHCP.
The processor compares and screens addresses using the mask to identify its own address to see if it
should listen to corresponding messages. The comparison occurs in binary. Any address position for
which the mask is set to a binary 1 will be compared; any address position for which the mask is set
to a binary 0 will be ignored. For example, if the mask is 255.255.255.0 the processor will listen to all
addresses whose first three segments match its own address regardless of the value in the last
segment. (255 in decimal equals to 1111 1111 in binary.)
0.0.0.0
Gateway
Address
1…254 in each field.
The IP address of the gateway that provides a connection to another IP network. This field is required
when you communicate with other network devices, not on a local subnet.
0.0.0.0
Default
Domain
Name
The default domain name can have the following formats:
’a.b.c’, ’a.b’ or ’a’, where a, b, c must start with a letter, end with a letter or digit, and have as interior
characters only letters, digits or hyphens. Maximum length is 63 characters.
NULL
Primary
Name Server
This is the IP address of the computer acting as the local Ethernet network Primary Domain Name
System (DNS) server.
0.0.0.0
Secondary
Name Server
This is the IP address of the computer acting as the local Ethernet network Secondary Domain Name
System (DNS) server.
0.0.0.0
Network Link
ID
0…199.
The Link ID assigned to the MicroLogix 1400 either by an RSLinx OPC topic or by the routing table in
a 1756-DHRIO or 1756-DH485 module.
0
Bootp Enable enabled, disabled
Check this box to enable Bootp. If enabled, this causes the processor at power up to try to obtain its
network-related parameters (IP address, subnet mask, gateway address, etc.) via BOOTP request.
You can not manually change the IP address if BOOTP is enabled. If you disable BOOTP make sure
that you have an IP address specified. If you change this field from enabled to disabled, the change
will take effect only when the system is restarted. If BOOTP is enabled, DHCP will be automatically
disabled.
Note: If BOOTP is enabled, you must have the BOOTP server running at all times because the
processor requests its address to the BOOTP server at any time during its power up.
1 (enabled)
DHCP Enable enabled, disabled.
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to client stations
logging onto a TCP/IP network. There is no need to manually assign permanent IP parameters. DHCP
is only available when BOOTP is disabled.
0 (disabled)
Ethernet Configuration Parameters
Parameter Options Programming
Software Default
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