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4.2
Operating principle of the encoder
The sensing system in the AHS/AHM36 CANopen und AHS/AHM36 CANopen Inox AHS/
AHM36 CANopen und AHS/AHM36 CANopen Inox is based on absolute acquisition
of revolutions without an external voltage supply or battery. As a consequence the
encoder can immediately output its absolute position again after switching off and
switching back on.
The AHS/AHM36 CANopen und AHS/AHM36 CANopen Inox acquires the position of
rotating axes and outputs the position in the form of a unique digital numeric value. The
highest reliability is achieved by means of electrosensitive, magnetic scanning.
The AHS36 is a singleturn encoder.
Singleturn encoders are used if absolute acquisition of the rotation of a shaft is
required.
The AHM36 is a multiturn encoder.
Multiturn encoders are used if more than one shaft revolution must be acquired abso‐
lutely.
4.2.1
Scaleable resolution
The resolution per revolution and the total resolution can be scaled and adapted to the
related application.
The resolution per revolution can be scaled in integers from 1 … 4,096 (Basic) or from
1 … 16,384 (Advanced / Inox).
The total resolution of the AHS/AHM36 CANopen und AHS/AHM36 CANopen Inox must
be 2ⁿ times the resolution per revolution. This restriction is not relevant if the round axis
functionality is activated.
4.2.2
Preset function
The position value for an encoder can be set with the aid of a preset value. I.e. the
encoder can be set to any position within the measuring range. In this way, e.g., the
encoder’s zero position can be adjusted to the machine’s zero point.
On switching off the encoder, the offset, the difference between the real position value
and the value defined by the preset, is saved. On switching back on the new preset
value is formed from the new real position value and the offset. Even if the position of
encoder changes while it is switched off, this procedure ensures the correct position
value is still output.
1
on switching off
2
on switching back on
PRODUCT DESCRIPTION
4
8016869/1EF3/2021-12-08 | SICK
O P E R A T I N G I N S T R U C T I O N S | AHS/AHM36 CANopen
AHS/AHM36 CANopen Inox
15
Subject to change without notice