Specifications

Glossary
EIO0000000051 6/2010 257
D
DDXML
Device Description eXtensible Markup Language
device name
A customer-driven, unique logical personal identifier for an Ethernet NIM. A device
name (or role name) is created when you combine the numeric rotary switch setting
with the NIM (for example, STBNIP2212_010).
After the NIM is configured with a valid device name, the DHCP server uses it to
identify the island at power up.
DeviceNet protocol
DeviceNet is a low-level, connection-based network that is based on CAN, a serial
bus system without a defined application layer. DeviceNet, therefore, defines a layer
for the industrial application of CAN.
DHCP
dynamic host configuration protocol. A TCP/IP protocol that allows a server to
assign an IP address based on a device name (host name) to a network node.
differential input
A type of input design where two wires (+ and -) are run from each signal source to
the data acquisition interface. The voltage between the input and the interface
ground are measured by two high-impedance amplifiers, and the outputs from the
two amplifiers are subtracted by a third amplifier to yield the difference between the
+ and - inputs. Voltage common to both wires is thereby removed. Differential design
solves the problem of ground differences found in single-ended connections, and it
also reduces the cross-channel noise problem.
digital I/O
An input or output that has an individual circuit connection at the module
corresponding directly to a data table bit or word that stores the value of the signal
at that I/O circuit. It allows the control logic to have discrete access to the I/O values.
DIN
Deutsche industrial norms. A German agency that sets engineering and
dimensional standards and now has worldwide recognition.