5
5.8
Motion Control with PROFIBUS–DP (from SW 3.1)
5-295
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
5.8.1
Equidistant DP cycle operation in the n–set mode
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.
Direct measuring system at X412 ––>
Encoder 2
(from SW 3.3)
Additional measuring system at X472
––> Encoder 3
TTL encoder, P0890 = 4, only SIMODRIVE 611 universal E
The encoder interface must be configured in the process data.
––> Refer to Chapter 5.6.5
n
set
Clo
ck
cycl
e
x
act
Current
control
Speed
control
M
∼
G
G
Motor
encoder
at X411/X412
n
set
Clo
ck
cycl
e
x
act
Current
control
Speed
control
M
∼
G
G
Motor
encoder
at X411/X412
n
set
DP master with
the ”Motion
Control with
PROFIBUS–DP”
function
e.g.
SINUMERIK
802D
Clock
cycle
x
act
PROFIBUS–DP
Current
control
Speed
control
M
∼
G
Position control loop
G
Measuring system
(encoder 2 or 3)
Motor encoder
at X411/X412
DP slave 611U
Fig. 5-25 Overview for ”motion control with PROFIBUS–DP”: Example with DP master and 3 DP slaves
Overview
5 Communications via PROFIBUS DP
08.99