05.2003
Function Blocks and Parameters
Siemens AG
6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES
Compendium Motion Control
4-5
The response of a function block is determined by function parameters.
Typical examples of function parameters are:
♦
Normalization of an input signal
♦
Acceleration or deceleration times in the ramp-function generator
♦
Proportional gain (Kp) and integral time (Tn) in the speed controller.
Function parameters can be indexed. The significance of the parameter
values stored in the various indices depends on the definition of the
respective parameter. A special group is formed by the function
parameters which are part of the so-called function data sets.
DT1 Element T1
0.0 ... 10.0 ms
P249.F (0.0)
Factory setting
Parameter name
Parameter number Parameter index
Value range
Fig. 4-5
Function parameters
Special function parameters are put together in function data sets.
These parameters are marked in the function diagrams with the
parameter index
.F
.
The parameters concerned are indexed four-fold, which means that one
parameter value can be stored under each parameter index, i.e. a total
of four parameter values can be stored.
The active function data set determines which value is currently being
used. If function data set 1 is active, the parameter value stored in
parameter index 1 is used. If function data set 2 is active, the parameter
value stored in parameter index 2 is used, etc.
Example:
P462.1 = 0.50
P462.2 = 1.00
P462.3 = 3.00
P462.4 = 8.00
A total of 4 values are stored under parameter P462 (Accel Time). If
function data set 1 is active, the acceleration time is 0.50 secs. If
function data set 2 is active, the acceleration time is 1.00 secs. If
function data set 3 is active, the acceleration time is 3.00 secs and if
function data set 4 is active, the acceleration time is 8.00 secs.
The individual function data sets are selected by means of control word
bits 16 and 17 in control word 2 (P576.B and P577.B). Changeover is
possible at any time.
The active function data sets are displayed via the visualization
parameter r013 (Active FuncDSet).
Function parameters
Function data sets
(Setpoint data sets)
