Siemens SINUMERIK 840D Simodrive 611 digital Startup Manual page 119

03/2006
Example A for
Spindle with raw signal encoder (500 pulses) attached directly to the spindle.
encoder matching Internal multiple = 2048. Internal calculation resolution = 1000 increments per
degree.
Internal resolution =
Internal resolution =
One encoder increment corresponds to 0.3515 internal increments. One
encoder increment corresponds to 0.0003515 degrees (highest possible
positioning resolution).
Example B for
Spindle with rotary encoder on the motor (2048 pulses), internal multiple =
encoder matching 2048,
There are 2 gear steps:
Gear step 1: Motor/spindle = 2.5/1
Gear step 2: Motor/spindle = 1/1
Gear step 1
Internal
resolution
Internal
resolution
One encoder increment corresponds to 0.034332 internal increments. One
encoder increment corresponds to 0.000034332 degrees (highest possible
positioning resolution).
Gear step 2
Internal
resolution
Internal
resolution
One encoder increment corresponds to 0.08583 internal increments. One
encoder increment corresponds to 0.00008583 degrees (highest possible
positioning resolution).
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
360 degrees
MD 31020 * 2048
360 * 1 * 1000
500 * 2048 *1
360 degrees MD 31080
=
*
MD 31020 * 2048 MD 31070
360 degrees 1
=
* *
2048 * 2048 pulses 1
360 degrees MD 31080
=
*
MD 31020 * 2048 MD 31070
360 degrees 1
=
* *
2048 * 2048 pulses 1
6 Programming the control
6.9 Axes and spindles
MD 31080
* 1000
*
MD 31070
0,3515
MD 31050
* 1000 incr/degr.
*
MD 31060
1
* 1000 pulses/degr. = 0.034332
2,5
MD 31050
* 1000 incr/degr.
*
MD 31060
1
* 1000 pulses/degr. = 0.08583
1
6
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