Operating Modes
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
622
of 820
4.8
Bits 12 and 13: Factor for interpolation interval
These two bits can be used to enter an increase of the cycle time of the new set values
compared to the fieldbus cycle time
Z131.18–. The cycle time of the new set values cor-
responds with the displayed effective interpolation interval (Z136.11–)
Effective interpolation interval = Factor * Fieldbus cycle time
At active interpolation (factor IP interval > 1) and simultaneous using of parameter
Z136.5– as input a deviation can occur between the 32 bit input angle (Z136.5–) and the
32 bit output angle (Z136.12–) at fixed input set value. This difference is caused by the
interpolation and is internally saved and is considered in the input set value with the next
motion.
Example 1:
New set values are to be transferred under the following conditions:
n New set values are transferred during each fieldbus cycle:
The setting of the interpolation procedure is therefore irrelevant Bit 8 = 0
Factor for IP interval = 1 Bit 13 = 0 and Bit 12 = 0
n The hardware and software limit switches should only report errors Bit 4 = 0
n The set values have the format 32 Bit angle
Input channel is thereby Z136.5– target angle Bit 2 = 1
n The extrapolation with set value failure should be effective Bit 1 = 1
n The synchronization at activation of the operating mode must be active Bit 0 = 1
Z136.2– Mode = 0007
hex
Example 2:
New set values are to be transferred under the following conditions:
n New set values are transferred during every second fieldbus cycle:
The square interpolation procedure is recommended as the interpolation procedure
Bit 8 = 1
Factor for IP interval = 2 Bit 13 = 0 and Bit 12 = 1
n The hardware and software limit switches should only report errors Bit 4 = 0
n The set values have the format 16 Bit angle and 16 Bit revolution
Input channel is thereby Z136.3– Target position Bit 2 = 0
n The extrapolation with set value failure should be effective Bit 1 = 1
n The synchronization at activation of the operating mode must be deactivated Bit
0 = 0
Z136.2– Mode = 1102
hex
NOTE!
A factor regarding the interpolation interval which is greater than 1 together with a
Z131.20– division ratio fieldbus task which is greater than 1 is not permitted. In this
case the error 917 "Position set value setting could not be initialized" when enabling
the operating mode -4.
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