Siemens SINUMERIK 828D Function Manual page 1393

Reference speed for path feedrate override
The reference speed for the path feedrate override specified via machine control panel can be set as different
from the standard value:
MD12082 $MN_OVR_REFERENCE_IS_MIN_FEED
Axis-specific feedrate override
For each positioning axis an enable signal and a byte for the feedrate override factor is in the NC/PLC interface.
DB31, ... DBX1.7 (override effective)
DB31, ... DBB0 (feedrate override)
The override factor can be specified from the PLC either in the binary or gray-coded format. This format being
used is communicated to the NC via the following machine data:
MD12000 $MN_OVR_AX_IS_GRAY_CODE (axis feedrate override switch gray-coded)
The following permanent assignment applies for binary code:
Binary code
00000000
00000001
00000010
00000011
00000100
...
01100100
...
11001000
For gray coding, the override factors corresponding to the switch setting should be entered into machine data:
MD12010 $MN_OVR_ FACTOR_AX_ SPEED (evaluation of axis feedrate override switch).
Effectiveness of the axis-specific feedrate override
Active in G33, G34, G35
For active G63
In active G331, G332
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Decimal
0
1
2
3
4
...
100
...
200
not functional
not active
(the override is set in the NC permanently to
100%)
not active
(the override is set in the NC permanently to
100%)
17.4 Feedrate control
Override factor
0,00 ≙ 0%
0,01 ≙ 1%
0,02 ≙ 2%
0,03 ≙ 3%
0,04 ≙ 4%
...
1,00 ≙ 100%
...
2,00 ≙ 200%
V1: Feedrates
1393