Siemens SINUMERIK 828D

V1: Feedrates
17.4 Feedrate control
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
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:
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).
Binary code Decimal Override factor
00000000 0 0,00 ≙ 0%
00000001 1 0,01 ≙ 1%
00000010 2 0,02 ≙ 2%
00000011 3 0,03 ≙ 3%
00000100 4 0,04 ≙ 4%
... ... ...
01100100 100 1,00 ≙ 100%
... ... ...
11001000 200 2,00 ≙ 200%
Effectiveness of the axis-specific feedrate override
Active in G33, G34, G35 not functional
For active G63 not active
(the override is set in the NC permanently to
100%)
In active G331, G332 not active
(the override is set in the NC permanently to
100%)