Specifications

Glossary
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31007715 6/2008
CRC cyclic redundancy check. Messages that implement this error checking mechanism
have a CRC field that is calculated by the transmitter according to the message’s
content. Receiving nodes recalculate the field. Disagreement in the two codes
indicates a difference between the transmitted message and the one received.
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:
z combine the numeric rotary switch setting with the NIM (for example,
STBNIP2212_010), or . . .
z edit the Device Name setting in the NIM's embedded web server pages
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.
Drivecom Profile The Drivecom profile is part of CiA DSP 402 (profile), which defines the behavior of
drives and motion control devices on CANopen networks.
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