Ip address, Subnet mask, Gateway – Measurement Computing E-PDISO16 User Manual
Page 13: Ip address -4, Subnet mask -4, Gateway -4
E-PDISO16 User's Guide
Installing the E-PDISO16
When a DHCP device requests an IP address, the DHCP server assigns, or "leases", a unique IP address to the
requesting device. The assigned IP address remains assigned to that device for a specified period, called the
lease duration. At the end of the lease duration, the lease is either renewed or the IP address becomes available
for assignment to another client.
If the DHCP client assigned to an IP address either reboots or powers down and up again, the client requests
another IP address from the DHCP server, and the DHCP server assigns an IP address as before. There is no
guarantee that the IP address is the same address previously assigned.
DHCP is a practical and efficient way of assigning and keeping track of IP addresses. If two clients are assigned
the same IP address, a communication failure will result that affects both devices.
If DHCP is disabled
If DHCP is not enabled, enter a static IP address into your E-PDISO16. The default DHCP setting is Enabled.
Unless you have a reason to disable DHCP (such as your network server is not DHCP-enabled), we recommend
that you leave DHCP enabled.
If you are not familiar with networks and their configurations, consult your network administrator prior to
installing the E-PDISO16. They can tell you if your network has a DHCP server, and if not, what static IP
address to use.
Caution! Assigning an arbitrary IP address could result in duplicate IP addresses on the network. This
condition can cause a communication failure that affects both devices.
Detecting a duplicate IP address
The E-PDISO16 can detect a duplicate IP address on the network. If the E-PDISO16 detects a duplicate IP
address, its
TEST
LED will flash continuously.
The only way to return the module to a stable state is to press the factory default button. This will reset the
module to the factory default configuration.
IP address
An Internet Protocol (IP) address is a unique 32-bit address that identifies a device on a TCP/IP network. An IP
address can be set dynamically (by a DHCP-enabled server), or you can enter a "static" address. The address is
typically represented in dotted decimal notation, which is defined as four groups of decimal numbers separated
by periods. The numbers can be between 0 and 255, inclusive. The default IP address is 10.0.2.251.
Subnet mask
A subnet mask is a code that helps a network device determine how a network's subnet is structured. The code
is represented in dotted decimal notation. The default subnet mask is 255.255.255.252.
Gateway
A gateway is the IP address of the device that bridges subnets within a network. The gateway address is
typically represented in dotted decimal notation. The default gateway address is 10.0.2.1.
Configuration information
For more information on the Ethernet configuration settings for your E-PDISO16, refer to the "PDISO8 and
PDISO16 Series" section of the "Digital Input/Output Boards" chapter in the Universal Library User's Guide.
This document is available on our web site at
2-4