Siemens SIMATIC S7 System Manual page 612

Open loop motion control
12.5 Configuring an Axis of Motion
● Single phase (1 output): If you select the single phase (1 output) option, then the output
(P0) controls the pulsing. Only positive motion commands are accepted by the CPU in
this mode. The Motion wizard restricts you from making illegal negative configurations
when you select this mode. You can save an output if your motion application is in one
direction only. Single phase (1 output) is shown in the figure below (assuming positive
polarity):
Polarity
You can switch positive and negative directions with the "Polarity" parameter. If the motor is
wired in the wrong direction, this is typically done. You can avoid re-wiring the hardware by
setting this parameter to negative. The negative setting changes the output operation as
follows:
● Single phase (2 output): P1 is low (inactive) if pulsing is in the positive direction. P1 is
high (active) if pulsing is in the negative direction. This is shown in the figure below:
● Two-phase (2 output): P0 pulses for negative directions. P1 pulses for positive directions.
This is shown in the figure below:
612
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART