Operating instructions

Appendix
109
Pepperl+Fuchs Inc. • 1600 Enterprise Parkway • Twinsburg, Ohio 44087-2245 • www.am.pepperl-fuchs.com
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PEPPERL+FUCHS
Resolution
Number of measuring steps per revolution or number of
revolutions of an absolute encoder.
Rise time
Duration for an electrical signal to change from low to high
level.
RS-232
Asymmetrical, serial, unidirectional interface between PC
and programmable absolute encoder.
RS-422
Symmetrical, serial, bidirectional interface. This interface
is used in incremental rotary encoders to transmit anti-
valent pulse channels: A, A, B, B, Z, Z. In case of absolute
encoders with SSI interface for the transmission of cycles
and data: cycle (+), cycle (-), data (+), data (-). Each signal
pair is passed through twisted pair cables.
RS-485
Symmetrical, serial, bidirectional interface. Basis for many
fieldbus systems.
Scaling
The number of steps per revolution. The number of
revolutions of a multi-turn can be set to between 1 and
4,096 depending on the type of encoder.
Selection of count direction
This control input can be used to define whether the
absolute encoder is to generate increasing values when
the shaft rotates clockwise (CW) or counter clockwise
(CCW). The shaft is always viewed from the shaft end.
Sense (-)
Used for the measurement of the effective encoder
supply voltage together with Sense+. Permits automatic
compensation of the power drop due to the encoder
cable.
Sense (+)
Used for the measurement of the effective encoder
supply voltage together with Sense-. Permits automatic
compensation of the power drop due to the encoder
cable.
Shaft load
The maximum permissible axial and radial force on the
encoder shaft. The force contact point is the center of the
shaft stub. If these forces are exceeded, the service life of
the bearing can be greatly reduced. Furthermore, there is a
danger of causing irreparable damage to the encoder.
Single-turn
Absolute encoder that delivers a defined number of
measuring steps within one revolution. After completion
of the revolution, the measured value returns from the
maximum to the minimum value (ex. 8192 to 0).
Speed
The speed indicates the mechanical load limit of the
encoder. If this limit is exceeded, the service life of the
bearing can be negatively affected. In addition, the signal
generation can be disturbed.
SSI
Synchronous Serial Interface. Used with absolute
encoders.
Starting torque
Torque required to accelerate the encoder shaft from
standstill.
Storage temperature
Permissible temperature limit values for an encoder that is
neither electrically connected nor mechanically stressed.
Track
See Channel.
Transmission rate
Speed of data transmission in absolute encoders.
Tristate
Absolute encoders with a parallel interface can be set to a
high-resistance state with using tristate input. This permits
multiplex operation, allowing several encoders to be
connected to one I/O point.
Voltage drop
Difference between supply voltage Ub and the maximum
high level.
V/R input
See selection of count direction.
Zero setting
See PRESET 1.