Festo CMMS-AS-G2 Series, Описание

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3 Control interfaces
34 Festo – GDCP-CMMS-AS-G2-FW-EN – 1310NH – English
3.3.3 Incremental signal (A/#A/B/#B/N/#N)
Signal Description
A/B (positive)
#A/#B (negative)
Differential incremental signals (RS422) to control the rotational
speed/direction.
– The signals “A/#A” and “B/#B” are out of phase. In the basic
setting, 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 determine the rotational speed/direction. The
square evaluation (fourfold) is used for this.
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. 3.9 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. 3.3 Timing diagram: incremental signal for direction of rotation to the right (basic setting)