9 keyword index / abbreviations – NORD Drivesystems BU0210 User Manual
Page 53
9 Keyword Index / Abbreviations
BU 0210 GB
Subject to technical amendments
53
9 Keyword Index / Abbreviations
Keyword Index:
Absolute (rotary) encoder,
single-turn
Rotary encoder, which outputs coded information for each measurement step
within a rotation. The data is retained even after a power failure. The data
continues to be recorded even without power.
Absolute (rotary) encoder,
multi-turn
Rotary encoder, as for absolute single-turn (rotary) encoder, however, the
number of rotations are additionally recorded.
Resolution
For single-turn rotary encoders, the resolution indicates the number of
measurement steps per rotation.
For multi-turn rotary encoders the resolution indicates the number of
measurement steps per rotation multiplied by the number of rotations.
Baud rate
The transmission rate for serial interfaces in bits per second
Binary code
The designation for a code in which messages are communicated by "0" and
"1" signals.
Bit / Byte
A bit (binary digit) is the smallest unit of information in the binary system. A byte
has 8 bits.
Broadcast
In a network, all slave participants are addressed simultaneously by the master.
CAN Bus
(Controller Area Network) designates a multi-master bus system with twin
conductor wiring. It operation is orientated to events or messages. At present,
standard CAN protocols are specified under CANopen.
CANopen
Designates a communications protocol based on CAN
Encoder
Electrical or opto-mechanical device for the detection of rotary movements.
These are categorised as absolute (rotary) encoders and incremental (rotary)
encoders.
Precision
Deviation between the actual and the measured position.
Total resolution
For single-turn rotary encoders, the resolution indicates the number of
measurement steps per rotation.
For multi-turn rotary encoders the resolution indicates the number of
measurement steps per rotation multiplied by the number of rotations.
Incremental (rotary) encoder
Encoders which output an electrical pulse (High/Low) for each measurement
step.
Jitter
Designates a slight fluctuation in precision in the transmission pulse, or the
variation in the transmission time of data packages.
Multi-turn (rotary) encoder
See "Absolute (rotary) encoder, multi-turn"
Reset position
Function for setting a zero point (or offset) at any position of the resolution
range of an encoder without mechanical adjustment.
Single-turn (rotary) encoder
See "Absolute (rotary) encoder, single-turn"
Pulse number
A number of light/dark segments are applied to a glass pulse disk. These
segments are scanned by a light beam in the encoder and therefore determine
the possible resolution of a rotary encoder.