encoder type of V90

Dear Sir,

while i tried to config the encoder of V90, i find there are 3 options of encoder.(please see the attachment)

1. incremental
2. absolute
3. Cyclie absolute

i know the different between item1 and item2 (incremental and absolute), but what is the different between item2 and item3?refer to the manual, item2 has 12bit?resolution and item3 has more.

what kind of encoder should i choose while config?if item3 has more resolution why do not just choose item3 every time? sorry for the poorly english and drive knowledge.

i am using TIAV14 SP1.

Thanks.

TechTeam

Hello, it is a TO setting.

Absolute actual value with setting absolute (measuring range > traversing range)

The axis position results directly from the current actual encoder value. The traversing range

must be within an encoder measuring range. This means that the zero passage of the

encoder must not be located in the traversing range.

When the controller is switched on, the axis position is determined from the absolute actual

encoder value.

Absolute actual value with setting cyclic absolute (measuring range < traversing range)

The encoder supplies an absolute value within its measuring range. The controller includes

the traversed measuring ranges and thus determines the correct axis position beyond the

measuring range.

When the controller is switched off, the traversed measuring ranges are saved in the

retentive memory area of the controller.

At the next power-on, the saved traversed measuring ranges are taken into account in the

calculation of the actual position value.

Notice:

Movements of the axis while the controller is switched off can skew the actual value

If the axis or the encoder is moved by more than half of the encoder measuring range while

the controller is switched off, then the actual value in the controller is no longer in accord

with the mechanical axis position.

Page 40:

https://support.industry.siemens.com/cs/ww/en/view/109749262

Dear Sir,

Thanks for your relpy:)! now i have a clearly concept of these stuff.

but - is that ok for me to always choose "Cyclie absolute"? why we still need absolute?