3
Control interfaces
Festo – GDCP-CMMS/D-FW-EN – 1404NH – English
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3.4.3
Incremental signals (A/#A/B/#B/N/#N)
Signal
Description
A/B (positive)
#A/#B (negative)
Incremental signals for controlling the rotational speed/direction.
–
The signals “A/#A” and “B/#B” are out of phase. In the basic set-
ting, without reversing the direction of rotation, the A signals are
90° ahead of the B signals if the direction of rotation is positive. If
the direction of rotation is negative, the B signals are 90° ahead of
the A signals. Through the phase shift and edge sequence (rising/
falling) of the signals “A/#A/B/#B”, the motor controller can de-
termine the rotational speed/direction.
N (positive)
#N (negative)
Zero pulse signals for identification of a revolution.
–
The signals “N/#N” serve as a reference mark for a revolution. In
the “Synchronisation” operating mode, these signals are used for
counting the revolutions. With each zero-pulse passage, counting
of the signals “A/#A/B/#B” is restarted.
Tab. 3.11 Overview: Incremental signal (A/#A/B/#B/N/#N)
Timing diagram: Incremental signal for direction of rotation to the right (basic setting)
Incremental signal: A
90°
Incremental signal: #A
Incremental signal: B
Incremental signal: #B
Zero pulse signal: N
Zero pulse signal: #N
Signal period
One revolution
Fig. 3.11 Timing diagram: Incremental signal for direction of rotation to the right (basic setting)
Summary of Contents for CMMD-AS series
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