Siemens SIMATIC S7-300 Manual page 192

Description of Functions
9.2.2 Open–loop control
Overview
In Control mode, voltages of various magnitudes are 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,
will be interrupted while the voltage is being output. After the Jogging sig-
nals R+ or R– have died off, control is referred to the new actual value, and
reinstated after the axis comes to a stop, if the controller enable is still active
when the axis stops.
Voltage values The voltage is defined with job no. 2.
You can choose between two mutually independent voltage values (level 1
and level 2) with the mode parameter (BP).
Volts
The values for the voltage levels can be changed during movement.
Handling by the The table below gives you an overview of how to handle this mode.
user
Triggering of move-
Note
Please see also Section 9.1.3!
Control actions
The control and checkback signals are handled in the same way as in "Jog-
ging" mode.
9-16
Name Lower input limit
0
Level selection
ment, Direction (R)
R+ or R–
"level-controlled"
Upper input limit
10 000
BP = 0 Value for voltage level 1
BP = 1 Value for voltage level 2
FM 354 Servo Drive Positioning Module
Unit
mV
Speed