Siemens SIMATIC S7 System Manual page 611

Phasing
You have four options for the "Phasing" interface to the stepper/servo drive. These options
are as follows:
● Single phase (2 output): If you select the single phase (2 output) option, then one output
(P0) controls the pulsing, and one output (P1) controls the direction. P1 is high (active) if
pulsing is in the positive direction. P1 is low (inactive) if pulsing is in the negative
direction. Single phase (2 output) is shown in the figure below (assuming positive
polarity):
● Two-phase (2 output): If you select the Two-phase (2 output) option, then one output (P0)
pulses for positive directions, and a different output (P1) pulses for negative directions.
Two-phase (2 output) is shown in the figure below (assuming positive polarity):
● AB quadrature phase (2 output): If you select the AB quadrature phase (2 output) option,
then both outputs pulse at the speed specified, but 90 degrees out-of-phase. The AB
quadrature phase (2 output) is a 1X configuration, meaning a generated pulse is
measured from one positive transition of the output to the next positive transition of the
same output. In this case, the direction is determined by which output transitions high
first. P0 leads P1 for the positive direction. P1 leads P0 for the negative direction. AB
quadrature phase (2 output) is shown in the figures below (assuming positive polarity):
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
AB quadrature phase (2 output)
(Positive polarity): positive rotation
P0 leads P1
Open loop motion control
12.5 Configuring an Axis of Motion
(Positive polarity): negative rotation
P1 leads P0
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