Emerson PACSystems RSTi User Manual page 219

User Manual
GFK-2745C
Special Modules
Encoder x4 (A:Aph, B:Bph): The Encoder x4 reads incoming pulse and returns
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number (0 to 16,777,215) to the RSTi Bus. The Encoder x4 only accepts 2 Phase
quadrature (90º) input. The mode senses the relationship between the 2 Phase
and counts up or down accordingly.
Given below is an example of timing waveforms of Encoder x4.
Figure 139: Timing Waveforms of Encoder x4
Period/Rate Mode (Gate Function Disabled): The Period/Rate Mode will return
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total Current Count Value to the RSTi Bus, by gating an Internal Sampling Clock
with an external signal. This mode determines the total number of input pulses
by counting the number of internal sample clock ticks over a user-specified
number of input signal pulses.
Given below is an example of timing waveforms of Period/Rate Mode.
Figure 140: Timing Waveforms of Period/Rate Mode
PWM (Pulse Width Modulation) Output Mode: The PWM Output Mode uses the
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Current counter value to generate a continuous rolling sequence of numbers.
The configurations of PWM range value have a frequency (1 to 20 KHz) and
duty cycle (0 to 100%). The PWM output can be used to direct the PWM signal
to terminal output.
Given below is an example of timing waveforms of PWM Output Mode.
Figure 141: Timing Waveforms of PWM Output Mode
Chapter 8
Nov 2019
206