Glossary of Technical Terms
A list of terms and definitions you may find helpful.
Absolute Rotary Encoder
An electromechanical device which converts the angular position into digital data which is retained on the removal of electrical power. Can also be used to determine linear position, and speed/acceleration.
Serves to monitor the shaft encoder for malfunctions, such as glass breakage, short circuit and insufficient line voltage.
An output signal which alters continuously.
Maximum load on the encoders shaft in the axial direction.
Rate of data transfer (bits per second). Often expressed in Mbaud, i.e. 12 Mbaud.
Operating in two directions.
Two logic states (Yes/No), the basis of binary data processing systems.
Code using binary numbering often used for absolute measuring systems.
The output signal is present until the reset conditions are met.
Abbreviation for “Binary Digit” where the logical value is expressed as 0 or 1 to give a yes or no decision.
Brushless DC Motor.
System for communication between several devices through a data line.
A sequence of 8 bits.
CW or CCW
Clockwise or Counter Clockwise.
An electronic circuit with encoder outputs to invert two channels and express a voltage difference between two lines thus removing interference along transmission cables that connect an incremental encoder with its controller.
See count frequency.
The number of count pulses per second [Hz].
Approval by the Canadian Standards Association.
Correspondence of data with the reality they describe.
BW shaft rotation, viewing the front display, the top of the rotary shaft is going away from the observer.
BZ shaft rotation, viewing the front display, the top of the rotary shaft is coming towards the observer.
Blocking of a function.
Duty Cycle [ED]
The ratio of pulse length to non-pulse period, a 40% duty cycle the pulse length is 4/10 and the non-pulse period 6/10 of the total time.
See duty cycle.
A binary code used with absolute encoders that changes only one data bit per measuring step at a time.
Incremental Rotary Encoder
An electromechanical device which converts the angular position into data (pulses determined by a marked disk). Can also be used to determine linear position, speed & acceleration. Incremental encoders do not retain positional data on removal of power.
Blocking of the counter input during counting operation.
The interface is used for communication between the counter and external systems. Count values can be input or output via the interface.
See Protection Class.
Blocking of certain keyboard inputs.
The reset button can only be operated by means of a key.
Liquid Crystal Display. A passive display requiring external light or backlighting to be read.
Light Emitting Diode. An active display lighting up as long as a supply voltage is fed to the device.
Least Significant Bit.
The out signal is active for a defined period.
Most Significant Bit.
Not connected. Defines unassigned connections in diagrams.
Transistor input/output circuit implemented with NPN transistor, and thus negative switching.
Non-volatile; electronic non-volatile memory for electronic counters used for value retention in case the supply voltage is interrupted.
OFF Delay Timing (Pneumatic Timers)
The OFF is delayed. The output valve is positive while timing and negative on timeout. Also referred to normally open timing.
ON Delay Timing (Pneumatic Timers)
The ON is delayed. The output valve is negative while timing and positive on timeout. Also referred to normally closed timing.
Output (preset, zero, signal).
Transfer point at which the data is transferred in parallel over several lines.
Transistor input/output circuit implemented with PNP transistor, and thus positive switching.
Pulses Per Revolution.
The factor by which the incoming pulses are multiplied.
Counters with control functions.
An IP rating is a two-figure code number, for example, IP40, the first digit being the degree of protection against the ingress of solids and the second digit being the degree of protection against water.
Polyvinylchloride, a plastic coating of device cables.
Maximum load on the encoders shaft in the radial direction.
Square wave signal generated by a reference mark, usually only one increment wide to provide an absolute reference for an incremental encoder.
Reset, see reset.
Resetting of a counter to its initial value.
A device for monitoring speed and angular position of an electric motor usually integrated on the rotor-shaft and sometimes known as a motor feedback controller.
The sense lines (Sense VCC and sense GND) enable measurement of the factual encoder voltage without adulteration by a voltage drop due to supply current and cable resistivity. With that, e.g. supply voltage can automatically be adjusted.
The application of force acting at a radial distance from a central point causing rotation.
A counter which only adds up received pulses without a control function.
Thermoplastic polyester elastomer, a plastic coating of device cables.
The first number indicates the rotation of the shaft, the second number shows the count value in the display.
Operating in a single direction.