Red Lion C48C - Manual (Page 23)

Decimal Point Position
Programmable for display of 0 to 5 digits right of decimal
point.
Count Input Mode
This parameter controls the Count / Control function of
Inputs A and B. It also allows Input B to be used as a User
Input when only uni-directional counting is required.
-17-
Count Modes
Input A signal is used for the count input. Input B is used in combination
with Input A for Count Direction Control, Quadrature counting, Anti-
coincidence Add/Subtract, or Anti-coincidence Add/Add counting applications.
C1-USR - The unit counts one count on every negative edge of the input signal
at Input A. In this mode, Input B acts as a user input and has no effect on the
count function.
C2-USR - The unit counts one count on every negative edge of the input signal
and one count on every positive edge of the input signal at Input A. In this
mode, the input signal is effectively doubled. Input B acts as a user input and
has no effect on the count function.
C1-UD - The unit counts one count on every negative edge of the input signal
at Input A. The direction of the count is determined by the logic state of Input
B. A high level at Input B causes the unit to count in a positive direction. A
low level causes the unit to count in a negative direction.
C2-UD - The unit counts one count on every negative edge of the input signal
and one count on every positive edge of the input signal at Input A. In this
mode, the input signal is effectively doubled. The direction of the count is
determined by the logic state of Input B. A high level at Input B causes the
unit to count in a positive direction. A low level causes the unit to count in a
negative direction.
AD-SUB - This mode effectively separates count pulses that may
simultaneously appear at the two inputs. The C48C processes the count
pulses into a string of time separated pulses, so the internal counter does not
miss any count pulses. Input A serves as the add input (count increments) and
Input B serves as the subtract input (count decrements).
AD-AD - This mode effectively sums count pulses that may simultaneously
appear at the two inputs. The C48C processes the count pulses into a string
of time-separated pulses so the internal counter does not miss any count
pulses. Input A serves as an add input (count increments) and Input B serves
as an additional add input (count increments).
MODE DESCRIPTION
------ No decimal Point
Decimal point for 10ths
----.-- Decimal point for 100ths
---.--- Decimal point for 1000ths
--.---- Decimal point for 10,000ths
-.----- Decimal point for 100,000ths
-----.-
MODE Input A Input B
C1-USr
* Count X1;
Count on falling edge
User Input B (See
UsrInb parameter)
C2-USr Count X2;
Counts on both edges
C1-Ud
*
Count X1;
Counts on falling edge
C2-Ud Count X2;
Counts on both edges Up/Down control;
Input B high = Up
Input B Low = Down
Ad-Sub Add count;
Counts on falling edge Subtract count;
Counts on falling edge
Ad-Ad Add count;
Counts on falling edge Add count;
Counts on falling edge
qUAd 1
Quadrature X1 Input Quadrature X1 Input
qUAd 2
Quadrature X2 Input Quadrature X2 Input
qUAd 4
Quadrature X4 Input Quadrature X4 Input
Up/Down control;
Input B high = Up
Input B Low = Down
User Input B (See
UsrInb parameter)
*- These are the
only count
input modes
available on
the Prescaler
Output model.
Cnt In
C1-Ud
dEc Pt
------