Activation Of Function - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions
12.19.4 Temperature compensation TC
Data format of user DB
• Length in words:
• Axis number:
• Absolute TC value K
TCabs
• Coefficient tan ß:
The following table gives an example description of the data format of tan ß
ß tan ß
0 0
30 0.577
45 1
-30 -0.577
-45 -1
• Reference point P :
0
The values K , tan ß and P
TCabs
followed by a fixed-point format conversion.
12.19.4.4

Activation of function

• TEMPERATURE COMPENSATION option must be available.
• Transmission of applicable compensation values via command channel to the NC
(cyclically or as a function of the NC PLC interface). Please refer to Interface Description,
Part 1, Signals, for more detailed description of command channel.
Caution:
Since the compensation values are immediately included in the calculation for the position
control, the surface quality may suffer if an axis is traversing and the change in compensation
value between two transmissions is too large.
12–190
Always value 7 in KF format
Values 1 to 30 in KF format
: With sign, in units (MS), in KF format
(value range ±1 073 741 823)
With sign, with significance 2
(value range -1....+1)
31
(tan ß) · (2 –1)
(dec.)
0
1 239 850 262
2 147 483 647
-1 239 850 262
-2 147 483 647
With sign, in units (MS), in KF format
(machine reference system, value range ±1 073 741 823)
can be entered as the result of a floating-point calculation,
0
© Siemens AG 1992 All Rights Reserved
-31
in KF format
31
(tan ß) · (2 –1)
(hex.)
0000:0000
49E6:9D16
7FFF:FFFF
B619:62EA
8000:0001
6FC5197- AA50
SINUMERIK 840C (IA)
09.95