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Interface to the encoder

240

ru33 has the position value at this position of the zero signal (because it is normal-

ised in 16 bits = 65536 = 1 revolution):

ru33 =

667

ec29 ∙ 4

∙ 65536 =

667

1000 ∙ 4

∙ 65536 = 10928

This formula is only valid if the gear factor in ec24 / ec25 is 1.

➢ Linear encoders with periodic reference marks

For linear encoders, the value of ec31 is positive if the first passed reference mark

is in the direction of ascending position values (from the switch-on position). If it is

in the direction of descending position values, it is negative.

When converting to position parameters such as ru33, it should be noted that for

linear encoders these refer to one virtual revolution in ec50, i.e.:

ru33 =

ec31

ec50 ∙ 4

∙ 65536

➢ Linear encoders with distance-coded reference marks (distance-coded

reference marks)

This variant of the reference mark track, mainly used by Heidenhain, consists of

many reference marks which all have a different distance to each other. From

these distances, the absolute reference can be calculated if two adjacent reference

marks have been passed.

At the beginning of the scale is the first reference mark (here is an excerpt from the

Heidenhain documentation):

1fghfh

Figure 64: distance-coded reference marks at Heidenhain

They are structured like this:

KEB COMBIVERT F6 Programming Manual

Other manuals for KEB COMBIVERT F6