Siemens Simatic S7-1500 Manual page 56

Technology functions
3.2 Pulse generators
● PTO (A, B phase-shifted): When you select the PTO signal type (A, B phase-shifted), the
two outputs pulses with the specified velocity, but phase-shifted by 90 degrees. This is a
1x combination in which the pulse shows the duration between two positive transitions of
A. In this case the direction is determined based on the output which first changes from 0
to 1. With positive direction, A preceeds B. With negative direction B preceeds A.
The number of generated pulses is based on the number of 0-to-1 transitions from phase
A. The phase ratio determines the direction of motion:
● PTO (A, B phase-shifted - quadruple): When you select the PTO signal type (A, B phase-
shifted, quadruple), the two outputs transmit pulses with the specified velocity, but phase-
shifted by 90 degrees. The quadruple signal type is a 4x configuration in which each edge
transition corresponds to an increment. Therefore, a full period of the signal A contains
four increments. In this way two outputs, each with 100 kHz signal frequency, can be
used to output a control signal that supplies 400,000 increments per second. The
direction is determined based on the output which first changes from 0 to 1. With positive
direction, A preceeds B. With negative direction B preceeds A.
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Phase A precedes phase B (positive motion)
Number of pulses
Phase A precedes phase B (positive motion)
Number of pulses
PTO (A, B phase-shifted)
Phase A follows phase B (negative motion)
PTO (A, B phase-shifted - quadruple)
Phase A follows phase B (negative motion)
Number of pulses
Number of pulses
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB