Bosch Rexroth IndraDrive MPH-02 Functional Description page 193

MPH-02, MPB-02, MPD-02
Linear Encoders
Rotary Encoders
Determining the "Distance-
Coded Reference Offset B"
Linear Encoders
Rotary Encoders
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Motor, Mechanical Axis System, Measuring Systems
general :
motor encoder
ext. encoder
S-0-0165: distance-coded reference offset A in number of DP
Xref: travel distance for establishing the absolute reference point in mm
DP, S-0-0116, S-0-0117: division period of the relative linear encoder in mm
Fig. 5-81: Determining the value for the "shorter distance" of the distance-
coded reference marks with a relative linear encoder
general :
motor encoder :
ext. encoder :
S-0-0165: distance-coded reference offset A in number of cycles
PHIref: travel angle for establishing the absolute reference point in degrees
Nzyk, S-0-0116, S-0-0117: number of cycles of the rotary encoder per 360°
Fig. 5-82: Determining the value for the "shorter distance" of the distance-
coded reference marks with a rotary encoder
If the value of "distance-coded reference offset B" is not directly indicated
in the data sheet of the distance-coded encoder, the value can only be
determined by means of calculation if the distance difference (longer
distance – shorter distance) is indicated in the data sheet of the encoder:
general :
motor encoder :
ext. encoder :
S-0-0166: distance-coded reference offset B in number of DP
Xref: travel distance for establishing the absolute reference point in mm
n: number of DP of the distance difference (big-small distance)
DP, S-0-0116, S-0-0117: division period of the relative linear encoder in mm
Fig. 5-83: Determining the value for the "longer distance" of the distance-coded
reference marks with a relative linear encoder
general :
motor encoder :
ext. encoder :
S-0-0166: distance-coded reference offset B in number of cycles
PHIref: travel angle for establishing the absolute reference point in degrees
z: number of cycles of the distance difference (big-small distance)
Nzyk, S-0-0116, S-0-0117: number of cycles of the rotary encoder per 360°
Fig. 5-84: Determining the value for the "longer distance" of the distance-coded
reference marks with a relative rotary encoder
Xref
− − =
S 0 0165
DP
− − =
: S 0 0165
−
S
− − =
: S 0 0165
−
S
∗
Nzyk PHIref
− − =
S 0 0165
360
− −
S 0 0116
− − =
S 0 0165
− −
S 0 0117
− − =
S 0 0165
+
Xref n
− − =
S 0 0166
DP
+
Xref n
− − =
S 0 0166
−
S
+
Xref n
− − =
S 0 0166
−
S
∗
Nzyk PHIref
− − =
S 0 0166
o
360
− −
S 0 0116
− − =
S 0 0166
360
− −
S 0 0117
− − =
S 0 0166
360
5-69
Xref
−
0 0116
Xref
−
0 0117
o
∗
PHIref
o
360
∗
PHIref
o
360
∗
DP
∗ − −
S 0 0116
−
0 0116
∗ − −
S 0 0117
−
0 0117
+
z
∗
PHIref
+
z
o
∗
PHIref
+
z
o