Siemens SIMATIC S7-300 Manual page 181

Table 9-1 Control signals, continued
Symbol
Name Name
English German
OVERRIDE OVERR Override
Note
For further functions, settings and commands concerning open–loop con-
trol, see Section 9.3.2 and Section 9.3.3.
FM 354 Servo Drive Positioning Module
Function Function
Time override
If you parameterize the "time override" function in MD37, there are
two ranges:
– range 100-255%: speed override operates as described above
– range 0-100%: time override operative
Speed, acceleration and deceleration are changed in such a way that the
time necessary for the traversing movement is directly correlated with
the override value.
Example: Cut override in half, from 100% to 50%
v
100 %
50 %
– speed v is cut in half
– acceleration and deceleration are quartered
v Override
prog
v = a
act act
100
Positioning time is doubled.
Taking the override into account as a time override presupposes the
following additional condition:
If a traversing movement consists of multiple positioning blocks
with block change on-the-fly (the axis does not stop between blocks),
changing the override value affects only the speed. Acceleration
and deceleration are additionally affected only after the axis comes
to a stop (e.g. reversal of direction).
Note:
Time override has effect only in the MDI and Automatic modes.
Description of Functions
v
prog
v
act
2
a Override
t 100
= t =
act
2
100 Override
t
9-5