High Country Tek emc-3L - Manual (Page 30)

3.14 Universal Inputs
There are three Universal Inputs on the DVC710.
These inputs are programmable to accept the most
common sensor outputs.
Four types of inputs are supported and are selectable
for each of the inputs. They are Analog Input (Voltage
or Current), RPM Pulse Input, Counter Mode input and
PWM Duty Cycle types. A fifth type of input is
Quadrature and using this requires two Universal
inputs to be used. These are inputs 2 and 3.
Quadrature is a method of determining speed and
direction using two pulse inputs.
On the DVC710 each universal input can have one of four ranges namely: –1 to +1volts, 0 to +5volts, 0 to
+10volts or 0ma to 22ma.
To identify a Universal Input in your application program, fill out the name field or use the default. Each
universal input needs at a minimum its input type and input range to be selected.
Note: The Universal Input configuration window will display certain fields while deactivating others based on the
Input Type and other options selected.
Input Fields
For Universal Inputs, the setup process is similar to the Analog Input setup. Refer to the previous Analog Input
section of this manual for a complete description of the analog input configuration options. The main difference
between Universal and Analog inputs is the input ranges supported. Analog inputs only support 0 to +5 volt
operation.
RPM Pulse Inputs
For RPM pulse inputs, specify the RPM Limits (min and max), and the RPM Calibration parameters (min and
max). RPM Calibration values set the 0 and 100% variable return values. The RPM Limits set error variables
when these values are met or exceeded. Because 0 RPM can never be counted, the Pulse Time Out field is the
number of seconds the system will wait until the RPM variable is set to 0 by the BIOS and the pulse time out
flag "name.LOS" is set. Pulses Per Rev is the number of pulses that the module will see for each revolution.
The DVC710 can count pulses to a total limit of 24 kHz combined on all three inputs.
Counter Mode Inputs
For Counter Mode pulse inputs, setup the min and max counts under Count Limits. The output value will be a
percent of the min to max difference. The counter value may be read or set by the application. The counter is
incremented on every falling edge of the pulse input. When the count reaches the max value it remains at that
value until set to a new value by the application program.
Quadrature Inputs
Quadrature is a method of determining Speed, Direction or Position using two pulse inputs. For a Quadrature
pulse input, setup the min and max count under Count Limits. Quadrature mode can only be selected with
Universal input #2 and will automatically use Universal input #3 for the second pulse train. The output will be
the percentage of the min to max count. The counter value may be read or set by the application. The counter
will be incremented or decremented on every rising and falling edge of both pulse trains based upon the phase
of the two inputs. Direction is determined by the phase of the pulses going up and down while speed is
determined by the absolute value of the pulse count change as a function of time.
Programming Tool, Universal Input Screen
P/N: 021-00163, Rev. A.0 - for V5.2 Tools Page | 30