Siemens SIMATIC S7-1500 Manual page 15

● Count up (A), count down (B):
One output (A) outputs pulses for positive directions and another output (B) outputs
pulses for negative directions.
● Incremental encoder (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 in low state.
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.
Technology Module TM PTO 4 (6ES7553-1AA00-0AB0)
Manual, 12/2016, A5E38896703-AA
①
Positive direction of rotation
②
Negative direction of rotation
A precedes B (positive direction of rotation)
Number of pulses
A follows B (negative direction of rotation)
Number of pulses
Product overview
2.2 Functions
15