Equidistant Dp Cycle Operation In The N-Set Mode - Siemens SIMODRIVE 611 universal Function Manual

08.99
5.8.1 Equidistant DP cycle operation in the n–set mode
Overview With the function, the closed–position control loop is closed through
PROFIBUS. The position controller is in the DP master, the closed–
loop current and speed control as well as the position actual value sen-
sing (encoder interface) are in the DP slave.
The position controller clock cycle is transferred to the DP slaves via
the fieldbus, and the slaves synchronize their speed/current controller
clock cycle to the position controller clock cycle of the DP master.
The DP master enters the speed setpoint.
The motor encoder or another measuring system can be used for the
position actual value sensing in the DP slave.
S
S
The encoder interface must be configured in the process data.
––> Refer to Chapter 5.6.5
Position control loop
DP master with
the "Motion
Control with
PROFIBUS–DP"
Clo
Clock
Clo
function
ck
cycle
ck
cycl
e.g.
cycl
e
SINUMERIK
e
802D
Fig. 5-25 Overview for "motion control with PROFIBUS–DP": Example with DP master and 3 DP slaves
E Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
5.8 Motion Control with PROFIBUS–DP (from SW 3.1)
Direct measuring system at X412 ––>
Additional measuring system at X472
TTL encoder, P0890 = 4, only SIMODRIVE 611 universal E
n Speed
set
n Speed
set
n Speed
control
set
control
control
x
act
x
act
x
act
PROFIBUS–DP
5 Communications via PROFIBUS DP
Encoder 2
(from SW 3.3)
––> Encoder 3
Motor
Motor
Motor encoder
encoder
encoder
at X411/X412
at X411/X412
at X411/X412
Current
M ∼
Current
M ∼
Current
control M ∼
control
control
G
G
G
Measuring system
(encoder 2 or 3)
DP slave 611U
5
G
G
G
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