Siemens SINUMERIK 840D Function Manual page 161

The override factor can be specified from the PLC either in the binary or Gray-coded format.
The format 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 to binary code:
With Gray coding, the override factors corresponding to the switch position must be entered in
the following machine data:
MD12010 $MN_OVR_ FACTOR_AX_ SPEED [<n>] (evaluation of the axis feedrate override
switch)
Effectiveness of the axis-specific feedrate override:
● With active G33, G34, G35:
● With active G63:
● With active G331, G332:
Spindle override
An enable signal and a byte for the spindle override factor are available in the NC/PLC interface
for each spindle:
DB31, ... DBX1.7 (override effective)
DB31, ... DBB19 (spindle override)
The override factor can be specified from the PLC either in the binary or Gray-coded format.
The format is communicated to the NC via the following machine data:
MD12060 $MN_OVR_SPIND_IS_GRAY_CODE (spindle override switch Gray-coded)
The following permanent assignment applies to binary code:
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Binary code
00000000
00000001
00000010
00000011
00000100
...
01100100
...
11001000
Binary code
00000000
00000001
00000010
00000011
Decimal
0
1
2
3
4
...
100
...
200
Not effective
Not effective
(the override is set in the NC permanently to 100%)
Not effective
(the override is set in the NC permanently to 100%)
Decimal
0
1
2
3
V1: Feedrates
5.4 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%
Override factor
0.00 ≙ 0%
0.01 ≙ 1%
0.02 ≙ 2%
0.03 ≙ 3%
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