Setup Of Servo-Controlled Positioning, Example - Siemens SIMATIC S7-300 Manual

Basic Principles of Positioning
Structure of a Figure 2-2 shows the structure of a position control circuit with the FM 354.
positioning circuit
Power grid
EMERG.
STOP
Power section
Safety
e.g., SIMO-
device
DRIVE 611-A
Motor
Fig. 2-2

Setup of servo-controlled positioning, example

FM 354
Servo-controlled positioning with output of an analog actuating signal for
the drive.
Power section The power section processes the analog actuating signal and delivers the
proper electric power to the motor.
Motor
The motor is actuated by the power section and drives the axis.
Mechanical trans-
These include not only the axis, but also gear trains and clutch systems.
mission elements
Encoder
The encoder detects movement of the axis. It supplies pulses to the FM 354.
The number of pulses is proportional to the distance traversed.
Peripherals
All other additional equipment is covered by the term peripherals.
Peripherals mainly include:
2-2
Reference
position
Movement
M
Mechanical transmission
elements
Limit switches to limit the positioning range (safety devices).
A programming device (PG) and the "Parameterize FM 354" parameter-
ization software.
FM 354
CPU
Parame-
Actual
terize
position
Encoders
Hardware limit
switch
"Parameterize FM 354"
FM 354 Servo Drive Positioning Module
PG