Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
541
of 820
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121.12 Position actual value revolutions with overflows
This parameter shows the current revolutions of the position actual values including the
revolution overflows
Z106.15–.
The function of this parameter is activated with bit 4 of Z121.1– Positioning general
mode.
The parameter is initialized at each encoder initialization, considering the sum of revolu-
tions of the encoder actual value (encoder for position controlling; see Z18.9–), the
M0-Offset (Z137.5–, Z137.6–) and the number of revolution overflows. If the overflows
of Z106.15– should be ignored, bit 5 in Z121.1– must be set.
The parameter has the further characteristics:
m Update with the cycle time of the fieldbus task Z1.10–.
m The parameter counts to the maximum value of [(Z137.2– * Z106.16–) - 1];
(Z106.16– Revolution overflow counter max value and
Z137.2– Number of revolutions (= "Multiturn area" of the encoder))
m No control-specific use in the controller.
m Writable in order to be set externally
m A homing in the mode " Referencing without setting the home position" has no influ-
ence on the parameter.
m A homing in the mode " Referencing with setting the home position" (Z120.2– Mode
bit 4 = 0) sets the parameter to the revolutions of Z120.3– Home position. The rev-
olution overflow counter is excluded!
121.13 Input revolutions of load gear
Input revolutions of load gear ("motor side")
121.14 Output revolutions of load gear
Output revolutions of load gear ("load side")
The parameters Z121.13– and Z121.14– are used for the calculation of Z121.17– Mod-
ulo position actual value only. The ratio motor/load is set via Z18.16– Gear ratio for the
control.
Changes in the parameters Z121.14– and Z121.13– become only then effective after
switching off and on again the modulo position actual value calculation (Z121.1– bit 4) in
Z121.17– Modulo position actual value!
If the load gear is used as well for weighting the Z136.3– Target position in the operation
mode Position control with synchronous position set value setting (Z109.1– set opera-
tion type = 4), the changed gear values are accepted only at an inhibit and of a new en-
able of the operation type -4.
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