Siemens SIMATIC ET 200SP Manual page 17

Product overview
2.2 Functions
• PTO (A, B phase-shifted):
Output pulses are output by both outputs at the specified velocity, but phase-shifted by
90 degrees. This involves a single pulse output in which the duration of the pulse is the
time between two transitions of signal A while signal B is at low level.
A positive direction of rotation is generated at a positive edge of signal A while signal B is
in low state. A negative direction of rotation is generated at a negative edge of signal A
while signal B is in low state.
• PTO (A, B phase-shifted, quadruple)
Output pulses are output by both outputs at the specified velocity, but phase-shifted by
90 degrees. This signal type involves a quadruple pulse output in which each edge
transition corresponds to one increment. Therefore, a complete period of signal A
contains four increments. In this way, it is possible, for example, to use two outputs, each
with 100 kHz signal frequency, to output a control signal that supplies 400,000
increments per second.
Whether count pulses are generated in the positive or negative direction of rotation
depends on the edge direction of one signal and the logic state of the other signal in each
case.
16
A precedes B (positive direction of rotation)
Position
A precedes B (positive direction of rotation)
Position
A follows B (negative direction of rotation)
Position
A follows B (negative direction of rotation)
Position
Technology module TM PTO 2x24V (6ES7138‑6EB00‑0BA0)
Equipment Manual, 09/2021, A5E50983437-AA