Siemens SINUMERIK 828D Function Manual page 1729

DB31, ...
DBX1.7 Override active
Edge evaluation: No
Signal state 1 or Feed rate override active:
edge change
The axis­specific feed rate 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 feed rate override switch gray coded)
and
MD12010 $MN_OVR_FACTOR_AX_SPEED [n] (evaluation of the axis feed rate 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 axis­specific feed rate override or spindle override is not active.
edge change
If the feed rate 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 Gray­coded
interface. In these cases, the override factors entered at the PLC interface are used.
For a binary interface, the override factor = 0. For a gray­coded interface, the value entered in the
machine data for the 1st switch setting is output as the override value.
Application The override value is generally specified using the axis­specific feed rate override switch or the
example(s) spindle override switch on the machine control panel.
The "feed rate override active" signal can be used to enable the feed rate 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 feed rate override is ineffective for:
•
•
•
The spindle override is inactive for:
•
Corresponding to .... DB31, ... DBB0 (feed/spindle override)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Signal(s) updated: Cyclically
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%)
active G63 (the override is defined in the NC at 100%)
Z1: NC/PLC interface signals
19.12 Feeds (V1)
1729