Siemens SINUMERIK 840D sl Function Manual page 1666

Z1: NC/PLC interface signals
19.12 Feeds (V1)
DB31, ...
DBX1.7 Override active
Edge evaluation: No
Signal state 1 or Feedrate override active:
edge change
The axis-specific feedrate override between 0 and a maximum of 200% entered in the PLC interface
0 → 1
is used.
The override factor is defined using the machine data:
MD12000 $MN_OVR_AX_IS_GRAY_CODE (axis feedrate override switch gray coded)
and
MD12010 $MN_OVR_FACTOR_AX_SPEED [n] (evaluation of the axis feedrate override switch).
Spindle override active:
The spindle override - input at the PLC interface - of 0 to a maximum of 200% is taken into account.
The override factor is entered using the machine data:
MD12060 $MN_OVR_SPIND_IS_GRAY_CODE (spindle override switch, Gray coded)
and
MD12070 $MN_OVR_FACTOR_SPIND_SPEED [n] (evaluation of the spindle override switch).
Signal state 0 or The existing axis-specific feedrate override or spindle override is not active.
edge change
If the feedrate override is inactive, "100%" is used as the internal override factor.
1 → 0
Exceptions are the zero setting for a binary interface and the 1st switch setting for a Gray-coded
interface. In these cases, the override factors entered at the PLC interface are used.
With a binary interface, the override factor = 0. With a gray-coded interface, the value entered in the
machine data for the 1st switch setting is output as the override value.
Application exam‐ The override value is generally specified using the axis-specific feedrate override switch or the spindle
ple(s) override switch on the machine control panel.
The "feedrate override active" signal can be used to enable the feedrate override switch from the PLC
user program, e.g. using the key-operated switch when commissioning a new NC program.
Special cases, The spindle override is always accepted with 100% in the spindle "Oscillation mode".
errors, ......
The spindle override acts on the programmed values before the limits (e.g. G26, LIMS...) intervene.
The feedrate override is ineffective for:
● Active G33
● Active G63 (the override is defined in the NC at 100%)
● Active G331, G332 (the override is defined in the NC at 100%)
The spindle override is inactive for:
● Active G63 (the override is defined in the NC at 100%)
Corresponding to ... DB31, ... DBB0 (feed/spindle override)
1666
Signal(s) updated: Cyclically
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions