Siemens SINUMERIK 840D sl Function Manual page 232

Functions
2.2 Constant travel time (channel-specific)
1:
2:
a
max
v
max
t:
The effect of the constant travel time can be seen from the figure above:
• Time: t
• Interval: t
• Time: t
The times t
constant travel time been defined.
2.2.2 Activation
2.2.2.1 Parameterization
Function
The constant travel time is parameterized for specific channels using machine data:
MD20500 $MC_CONST_VELO_MIN_TIME
(minimum time with constant velocity)
2.2.3 Programming
Key statement
The function is not programmable.
14
Characteristic with constant travel time
Characteristic without constant travel time
: Maximum acceleration value
: Maximum velocity value
Time
1
End of acceleration phase with sudden acceleration 1 * a
- t
1 2
Acceleration 0; constant velocity using the parameterized constant travel time
2
Start of braking phase with sudden acceleration 1 * a
, t ' and t ' indicate the characteristic that would have been produced had no
0 1 2
max
max
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0