Siemens SINUMERIK 840D sl Function Manual page 1754

Detailed description
2.3 Feedrate control
Spindle override" DB31, ...DBB0"
One enable signal and one byte is provided on the PLC interface for the override factor for
each of the spindles.
IS "Spindle override" (DB31, ... DBB19)
IS "Override active" (DB31, ... DBX1.7)
The interface for the spindle override can be provided by the PLC in binarycoded or Gray-
coded format.
Machine data:
MD12060 OVR_SPIND_IS_GRAY_CODE (spindle override switch is Graycoded)
is used to define whether binary or Gray coding is active.
The following permanent assignment applies to binary coding:
Code
00000000
00000001
00000010
00000011
00000100
.
.
.
01100100
.
.
.
11001000
With Gray coding, the override factors corresponding to the switch setting are entered in
machine data:
MD12070 OVR_FACTOR_SPIND_SPEED [n] (analysis of spindle override switch).
Activation of spindle override
If G33, G34, G35 active:
If G63 active:
If G331, G332 active:
38
Override factor
0,00 ≙ 0%
0,01 ≙ 1%
0,02 ≙ 2%
0,03 ≙ 3%
0,04 ≙ 4%
.
.
.
1,00 ≙ 100%
.
.
.
2,00 ≙ 200%
Effective
(if the spindle is in position control mode, the
override switch may be activated)
Not effective
(the override is set to a fixed value of 100% in the
NC)
Effective
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0