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Operating Modes
Operating Modes for Pulse and Incremental Encoders
Overview
Operating modes 1 ... A are described below.
Operating Mode 1: Down Counter for Pulses
In this operating mode, all pulses of counter input A are used for down counting,
beginning from a preset value (default = 0). Counter input B has no function. Pulse
encoders with 5V differential output as well as pulse encoders with 24V single ended
output (24V initiators) can be connected. Two digital outputs can be controlled using
two programmable threshold values. See the example Up Counter (Mode 2)
(see page 104).
Operating Mode 2: Up Counter for Pulses
In this operating mode, all pulses of counter input A are used for up counting,
beginning from a preset value (default = 0). Counter input B has no function. Pulse
encoders with 5V differential output as well as pulse encoders with 24V single ended
output (24V initiators) can be connected. Two digital outputs can be controlled using
two programmable threshold values. See the example Up Counter (Mode 2)
(see page 104).
Operating Mode 3: Reserved
Corresponds with operating mode 0.
Operating Mode 4: Counting with Incremental Encoder with 1/1 Logic
Position measurement with incremental encoders is carried out according to the
counting procedure. The measuring system must therefore be reset after switching
on or power failure. The encoder transmits a reference signal (zero pulse) to do this.
In order to identify the direction of spin when counting up or down, the incremental
encoder sends two periodical square wave signals in quadrature, which are
evaluated by the 170 AEC 920. Two digital outputs can be controlled using two
programmable threshold values.
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