Siemens S7-1200 System Manual page 447

● PTO (A/B phase-shifted): If you select a PTO (A/B phase-shifted) option, then both
● PTO (A/B phase-shifted - fourfold): If you select a PTO (A/B phase-shifted - fourfold)
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
outputs pulse at the speed specified, but 90 degrees out-of-phase. It is a 1X
configuration, meaning one pulse is the amount of time between positive transitions of
P0. 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.
The number of pulses generated is based upon the number of 0 to 1 transitions of Phase
A. The phase relationship determines the direction of movement:
PTO (A/B phase-shifted)
Phase A leads phase B (positive movement)
Number of pulses
option, then both outputs pulse at the speed specified, but 90 degrees out-of-phase. The
fourfold is a 4X configuration, meaning one pulse is the transition of each output (both
positive and negative). 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.
Fourfold is based upon positive and negative transitions of both Phase A and Phase B.
You configure the number of transitions. The phase relationship (A leading B or B leading
A) determines the direction of movement.
PTO (A/B phase-shifted - fourfold)
Phase A leads phase B (positive movement)
Number of pulses
Technology instructions
Phase A lags phase B (negative movement)
Number of pulses
Phase A lags phase B (negative movement)
Number of pulses
9.3 Motion control
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