Siemens SINUMERIK 840C Installation Instructions Manual page 371

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.7.1 Axis-specific MD bits 2 (axial bits 2)
Special case "parking axis"
The axial interface signal "Parking axis" also causes the interface signal "Reference point
reached" to be deleted for an axis with SIPOS/Endat absolute encoder. When bit 3 of MD
1808* is set, a new referencing is suppressed. The absolute value is not transferred until
POWER ON.
Note:
Reference point approach can be carried out again when MD 1808* bit 3 is deleted.
Bit 3 Bit 3=1 The value NC MD 396* for the absolute value is valid.
Bit 2
Bit 2=1 Machine system and SIPOS/Endat absolute system (or distance-coded linear
Bit 2=0 Machine system and SIPOS/Endat absolute system (or distance-coded linear
Bit 1 Bit 1=0 Absolute offset results from MD 396
Bit 1=1 Absolute offset results from MD 396
Default value:0
Bit 0 Bit 0=1 The NC axis is equipped with an absolute encoder.
NC MD
1812*
Bit 7
Bit 7=1 With bit 7 it is possible to take account of different ways in which the master
_______
1) As from SW 4
2) As from SW 4.4
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Meaning for SIPOS:
Distance coding:
To be able to calculate the machine absolute value after NC reset, it is
necessary to know whether the value of the absolute encoder (or distance
coded linear scale) gets larger or smaller as the machine absolute value
increases.
scale) are of opposite sense
scale) are of same sense
(+/- depends on sign of MD 396
The absolute value is transferred on POWER ON for both measuring systems.
Caution:
When the control is being installed for the first time, you must perform
POWER-ON after declaring the encoder otherwise positioning errors will
occur!
7 6 5
Sign
Torque compensation
inversion
controller
setpoint
controls controls
master/
master/ master/
slave 2)
2) 2)
slave slave
Sign inversion setpoint master/slave
and slave drives might be connected to the common output without having to
change the polarity and the direction of travel of the individual drives (MD 5640
bit 1 and 2). This bit only has to be set if, given a positive setpoint, the
axes/spindles would rotate in opposite directions at the mechanical coupling.
ManualsBase.com
After power-on the signal "reference point
reached" is set for this axis.
The referencing procedure is performed with this
value and acknowledged with "reference point
reached".
*
*
+/- 99 999 999
* )
Bit No.
4 3 2
Master/ Adaptation
Pos.-contrl.
slave comp. time
follow-up on
operation const.
error (as
after Power neural QEC
from SW 5)
On 2) 1)
©
Siemens AG 1992 All Rights Reserved
04.96
1 0
Learning
phase Neural
1)
neural QEC QEC
1)
6FC5197- AA50
SINUMERIK 840C (IA)