4
01.99
4.6
Parameters for hardware, operating mode and clock cycles
4-140
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
For ”SIMODRIVE 611 universal”, the clock cycles (current controller,
speed controller, position controller and interpolation clock cycles) are
set as standard, and generally do not have to be changed.
However, the speed controller dynamic performance can be further en-
hanced by reducing the clock cycle times (current controller and speed
controller clock cycles).
Note
In standard operation, use the standard clock cycle settings.
After the clock cycles have been changed, the ”calculate controller
data” function (P1080 = 1) should be executed.
Table 4-6
Clock cycle parameters
Parameters
No.
Name
Min.
Standard
Max.
Units
Effective
1000
Current controller clock cycle
2
4
4
31.25
µ
s
PO
1001
Speed controller clock cycle
2
4
16
31.25
µ
s
PO
1009
Position controller cycle
32
32
128
31.25
µ
s
PO
1010
Interpolation clock cycle
64
128
640
31.25
µ
s
PO
The clock cycles are derived from the basic hardware clock cycle (31.25
µ
s).
When changing the clock cycles, the data in the following tables and the associated limitations
must be observed.
Current
Speed
Position
Interpolation
ctr clk cycle
ctr clk cycle
ctr clk cycle
clock cycle
P1000
P1001
P1009
P1010
4 (125
µ
s)
4 (125
µ
s)
32 (1 ms)
128 (4 ms)
Standard
2 (62.5
µ
s)
2 (62.5
µ
s)
1 ms
4 ms
Possible values
4 (125
µ
s)
4 (125
µ
s)
to
to
(also refer to
8 (250
µ
s)
4 ms
20 ms
Limitations)
12 (500
µ
s)
Tip: 31.25
µ
s
32 = 1 ms
Clock cycles
Values
Limitations:
The clock cycles for both active axes must be set the same on a control board.
Current controller clock cycle: for 2 active axes and positioning, 62.5
µ
s is not permissible
Speed controller clock cycle:
Speed controller clock cycle
Current controller clock cycle
for 2 active axes, 62.5
µ
s is not permissible
Position controller clock cycle: must be an integer multiple of the speed contr. clock cycle
Interpolation clock cycle:
must be an integer multiple of the position contr. clock cycle
Parameters
for
clock cycles
4 Commissioning
04.99
