Siemens SIMATIC FM 353 - Open-Loop Control

Description of Functions
9-18
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
9.2.2 Open-loop control
Overview
In the “Control” mode, a frequency with selectable magnitude is specified and then
used to perform a controlled movement. The direction of movement is determined
by way of direction keys (R+ or R−).
The actual value of the axis is updated at the same time.
Note
A closed-loop controller, which may have been activated by a servo enable, is in-
terrupted while the frequency is being output. After the Jogging signals R+ or R−
have died off, servo control is referred to the new actual value, and reinstated after
the axis comes to a stop, if the servo controller enable is still active when the axis
stops.
Frequency values
The frequency is specified in the user DB, DBX38.1.
You can choose between two mutually independent frequency levels (level 1 and
level 2) with the mode parameter (BP).
Name Lower input limit Upper input limit Unit
Frequency 0 200 000 Hz
The values of the frequency levels can be altered during movement.
Handling by the user
The table below gives you an overview of how to handle this mode.
Triggering of
movement, Direc-
tion (R)
Level selection Speed
R+ or R−
BP = 1 Value for frequency level 1
R+ or R
“level-controlled”
BP = 2 Value for frequency level 2
Note
Please see also Section 9.1.3!
Control actions
The control and checkback signals are handled in the same way as in “Jogging”
mode.