Siemens SIMATIC FM 353 Manual page 205

Table 9-1 Control signals, continued
Symbol
English German
OVERRIDE OVERR
Note
For further functions, settings and commands concerning open-loop control, see
Section 9.3.2 and Section 9.3.3.
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Name
Name
S
Override 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 %
f
ss
− speed v is cut in half
− acceleration and deceleration are quartered
− Cut override in Start/Stop frequency
v
prog
v =
act
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
Function
Function
v
prog

Override
a
Override
a =
act
100 100
v
act
t
2
t
100
t =
act
2
Override
9-5