12 |
M 5 7 5 1
Digital Input Binary
DIN_0
Inactive
Active
Inactive
Active
Inactive
Active
Inactive Active
DIN_1
Inactive Inactive
Active
Active
Inactive Inactive
Active
Active
DIN_2
Inactive Inactive Inactive Inactive
Active
Active
Active
Active
Digital_Input
Display (Binary)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
5.3.1.1 Pulse Measurements
Pulse measurements include Digital Input (DIN), Frequency (RATE), Pulse Width (WIDTH), Duty Cycle (DUTY),
Phase Delay Between Pulse Inputs (DELAY), Up Counter/Totalizer (COUNT), and Up/Down Counter/Totalizer
(UP/DOWN COUNT). All measurements are derived from signal transitions and an internal 32.768 kHz time
reference. The pulse input signal is read on the Pulse A input (pin 2) and the reset input signal is read on the
Reset input (pin 5). The third input on pin 4 changes its functionality depending on the pulse measurement
type and can be Enable, Direction, or Pulse. When the reset input is
activated
then the pulse input value is
zeroed for all pulse measurement types. When the third input pin is configured as an enable input and is
deactivated
then the pulse input value is zeroed. Unless otherwise stated, the third input pin defaults to
Enable functionality which must be set HIGH to allow measurement.
The
Digital Input (DIN)
mode reports the binary value on the DIN pulse input pins. Note the DIN inputs
replace the functionality of the Pulse, Reset, and Enable inputs.
Two measurement modes are used when measuring
Frequency (RATE)
. If the measured frequency is
greater than 100 Hz the total number of pulses/second is used to determine the frequency. If the measured
frequency is less than 100 Hz the time between rising edges is used to calculate the frequency.
The
Pulse Width (WIDTH)
setting measures the active portion of a periodic signal in msec. The pulse input
may be configured to be active high or active low to measure the positive or negative portion of the pulse
width. See the Input Configuration Diagrams section for details.
Frequency (RATE) = Total
Count/second if > 100 counts/second
Frequency (RATE) = 1/pulse period if
frequency < 100 counts/second
Pulse Width
Figure 9: Frequency (rate) example
Figure 10: Positive pulse width example
Figure 8: Digital Input example
Digital Value 1
Digital Value 0
