PMA KS 98 - Page 71

Function up counter:
At each positive flank (0 r 1) at input up, output Count is increased by 1, until the max. limit is reached. Carry output
carry is set to 0 for the duration of the applied pulse. With the next pulse, output Count returns to the min. value and
continues counting with the next pulses.
a
If the down-input is wired, the up counter is prepared by signal 1 at input down. If not , counting is not possible.
I.e. there must be a 1 signal at input down prior to
input up, if the pulse shall be counted.
Function down counter:
With each positive flank (0 r 1) at input down, output Count is decreased by 1, until the min. limit is reached. Subse
-
quently, borrow output borrow is set to 0 for the duration of the applied pulse 0. With the next pulse, output Count re
-
turns to the max. value and continues counting down with the next pulses.
a
If the up-input is wired, the down counter is prepared by signal 1 at input up. If not , counting is not possible.
I.e. there must be a 1 signal at input up prior to input down, if the pulse shall be counted.
Function reset:
A 1 signal at input reset has priority over all other inputs. reset resets the count to the min. value.
Function preset:
A 1 signal at input preset has priority over inputs up and down. preset resets the count to the preset value.
The origin of the preset value is selected with parameter Mode.
w
Mode = Para.y0 means that the preset value corresponds to parameter y 0.
w
Mode = InpPreset means that the preset value corresponds to analog input Preset.
With a preset value higher than the max. limit, output Count is set to the max. limit. A preset value smaller than the
min. limit is set to the min. limit. A preset value which is not an integer is rounded off.
Inputs/outputs
Digital inputs
up
Input for clock up - pulse count up
down
Input for clock down - pulse count down
preset
Input for the preset mode - output Count goes to value Reset.
reset
Input for the reset mode - output Count goes to value Min.
Analog input
Preset
Analog input for external preset value
Digital outputs
carry
Carry output (clock - up)
borrow
Borrow output (clock - down)
Analog output
Count
Count output
9499 040 50611 Signal converters
71 COUN (up/down counter)