Siemens SINUMERIK 808D Function Manual

Function Manual
178 01/2017
The interface for the override (value) is supplied by a machine control panel via the PLC to the NC and it is Gray-coded.
An active feedrate override acts on all path axes. An active rapid traverse override acts on all axes traversing with rapid
traverse.
If there is no dedicated rapid traverse override switch, the feedrate override switch can be used. In this case, feedrate
overrides above 100% are limited to 100% for rapid traverse override.
The override to be active can be selected via the PLC or operator panel.
If the selection is made using the operator panel (display: ROV), the IS "Feedrate override for rapid traverse selected"
(DB1700.DBX0001.3) is set and must be transferred by the PLC user program to the IS "Rapid traverse override active"
(DB3200.DBX0006.6). The value itself is to be transferred by the PLC user program from a machine control panel to the IS
"Rapid traverse override" (DB3200.DBB0005).
The channel-specific feedrate and rapid traverse overrides are inactive if G33, G63, G331 and G332 are active.
Axis-specific feedrate override
One enable signal and one byte for the feedrate override factor in percent are available on the PLC interface for each axis:
● IS "Feedrate override" (DB380x.DBB0000)
● IS "Override active" (DB380x.DBX0001.7)
If G33, G331, G332, G63 are active, the axis-specific feedrate override has no effect (is internally set to a fixed value of
100%).
Spindle override
One enable signal and one byte for the spindle override factor in percent are available on the PLC interface for each spindle:
● IS "Spindle override" (DB380x.DBB2003)
● IS "Override active" (DB380x.DBX0001.7)
The additional signal IS "Feedrate override for spindle valid" (DB380x.DBX2001.0) allows the PLC user program to
determine that the value of the IS "Feedrate override" (DB380x.DBB0000) should apply.
The spindle override is active with G33, but it should not be actuated for reasons of accuracy; also active with G331, G332.
In the case of G63, the spindle override is set to a fixed value of 100%.
Override active
The set override values are effective in all operating modes and machine functions. This applies if the IS "Rapid traverse
override active", "Feedrate override active" or "Override active" are set.
An override factor of 0% acts as a feedrate disable.
Override inactive
When the override is inactive (i.e. the above interface signals are set to "0"), the override factor "1" is used internally for all
switch positions (except from the 1st position), i.e. the override is
100%
.
Note
The 1st switch position of the Gray
-
coded interfaces for the value represents a special case. In this case, the override factor
of the 1st switch position is also used if the IS "Rapid traverse ov
erride active", "Feedrate override active", "Override active"
are not set. Thus 0%
is issued as the override value for axes (acts the same as "Feed disable"). The following applies to the
spindle if the IS "Override active" is not set: Override value 50%
.
18.4
Data table
18.4.1
Machine/setting data
Number
Identifier
Name
General machine data
10240
SCALING_SYSTEM_IS_METRIC
Basic system metric
Channel-specific machine data

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English