Times In The Equidistant Dp Cycle - Siemens SIMODRIVE 611 universal Function Manual

5 Communications via PROFIBUS DP
5.8 Motion Control with PROFIBUS–DP (from SW 3.1)
5.8.3

Times in the equidistant DP cycle

General
information
Table 5-37 Time settings for "DP slave 611U"
1)
Name Value
T 5DC
BASE_DP hex
8 1500
:
dec
T 8
DP
T 1
MAPC
T 5DC
BASE_IO hex
8 1500
:
dec
T 2
I
T 4
O
5-300
The "DP slave 611U" requires the following time information for equidi-
stant operation, clock cycles and signal processing instants:
Limit value
– Time base for T
Calculation: T
T
Bit
w T
T DP cycle time
DP DP_MIN
T
DP
Calculation: T
T = 8 Minimum DP cycle time
DP_MIN
Calculation: T
n S T
Master application cycle time
DP
n = 1 – 14 This is the time frame in which the master application
generates new setpoints (e.g. in the position controller
cycle).
Calculation: T
– Time base for T
Calculation: T
T
Bit
v T
T < T Time of actual value sensing
I_MIN I DP
Is the time, where the position actual value is sensed
before the start of a DP cycle.
T = integer multiple of T
I
Calculation: T
For T
T = 1 Minimum T
I_MIN
Calculation: T
T + T Time of setpoint transfer
DX O_MIN
v T v T
O DP This is the time that the setpoints (speed setpoint) are
transferred to the closed–loop control after the start of
DP cycle.
T
O
Calculation: T
For T
T = 1 Minimum time interval between T
O_MIN
T
O_MIN
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
Description
DP
= 1500 S T
BASE_DP
= 1/12 µs at 12 Mbaud
= integer multiple S T
BASE_DP
= 8 S T
DP BASE_DP
= 8 S T
DP_MIN BASE_DP
= 1 S T
MAPC DP
, T
I O
= 1500 S T
BASE_IO
= 1/12 µs at 12 Mbaud
BASE_IO
= 2 S 125 µs = 250 µs
I
= 0, the following is valid: T
I
I
= 1 S T
I_MIN BASE_IO
= integer multiple of T
BASE_IO
= 4 S 125 µs = 500 µs
O
= 0, the following is valid: T
O
= 1 S T = 125 µs
BASE_IO
E Siemens AG 2005 All Rights Reserved
08.99
= 125 µs
Bit
= 1 ms
= 1 ms
= 1 ms
= 125 µs
Bit
8 T
I DP
= 125 µs
8 T
O DP
and T
O DX