Example: Changing An Attachment Head For Two Direct Position Measuring Systems - Siemens SINUMERIK 840D sl Function Manual

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3.2.9.4

Example: Changing an attachment head for two direct position measuring systems

Initial situation
● Attachment head "A" has an encoder E3.
● Attachment head "B" does not have an encoder.
● Spindle "SP" has two encoders E1 and E2.
● One of the following two telegram types is configured in MD13060
$MN_DRIVE_TELEGRAM_TYPE (standard telegram type for PROFIdrive):
– Telegram 118 (two external encoders)
– Telegram 138 (two external encoders, plus torque precontrol)
References:
For information with regard to the encoder assignment, see:
Commissioning Manual, CNC Commissioning: NC, PLC, Drive;
Section: "Communication between the NC and the drive" > "Drives: Assign axis"
● The following position measuring systems are configured in the spindle "SP":
– Direct encoder E2 as position measuring system 1
– Direct encoder E3 as position measuring system 2
● Attachment head "A" with encoder E3 is currently mounted on the spindle.
● Position measuring system 2 is the active measuring system:
DB31, ... DBX1.6 = 1
Position measuring system 1 is passive.
● The "Park passive position measuring system" function is:
– Not active for position measuring system 1:
– Active for position measuring system 2:
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Attachment head "A" is now mounted on the spindle.
The user activates position measuring system 2:
DB31, ... DBX1.6 (position measuring system 2) = 1
As a consequence, position measuring system 1 is also simultaneously activated; This
is because the "Park passive position measuring system" function is not active for po‐
sition measuring system 1 (motor measuring system!). Position measuring system 1
becomes a passive position measuring system.
The controller then sets the status signals for the position measuring systems:
DB31, ... DBX102.5 (position measuring system 1 activated) == 1
DB31, ... DBX102.6 (position measuring system 2 activated) == 1
or
MD31046 $MA_ENC_PASSIVE_PARKING [ 0 ] = 0
MD31046 $MA_ENC_PASSIVE_PARKING [ 1 ] = 1
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
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