NORD Drivesystems BU0210 - 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.