Siemens SIMATIC FM 353, Manual

Page: 38 / 361

Wiring
4-6
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Output signals
Clock, directional and enable signals are provided. In addition, an additional signal
can be parameterized for current generation.
S PULSE
The clock pulses control the motor. The motor executes one increment in re-
sponse to each rising pulse edge.
This means that the number of pulses which are output determines the angle of
rotation, i.e. the distance to be traversed.
The pulse frequency determines the speed of rotation, i.e. the traversing speed.
S DIRECTION
The signal levels which are output determine the direction of rotation of the mo-
tor.
Signal ON:
“Rotation to left”
Signal OFF: “Rotation to right”
S ENABLE
The FM 353 activates this signal anytime the cyclical control operating mode is
detected.
Signal ON:
Power activation is enabled
Signal OFF: Depending on power section, one or more of the
responses mentioned may occur:
− Disable pulse input
− Switch off power to motor
− Reset ring counter
− Erase error messages
S PWM / BOOST
This signal is for purposes of altering the motor current.
In the “PWM” function, a pulse width modulated signal is output which can be
used to adjust the motor current between 0 and 100%.
The “BOOST” function can be used to amplify the motor current:
Signal ON:
Motor current increases
Signal OFF: Motor current normal
The use of this signal must be defined in the machine data (see MD37, Section
5.3.1, 9.7.2).