West Control Solutions KS98-1 - Manual (Page 120)

III-5.5 COUN (up/down counter (No. 74))
‘COUN’ is an up/down counter and counts the events at input up or down, which are available at the up or down input
for at least the duration of the time group in which the function runs.
reset preset Mode
0 0 GO (default)
0 1 Preset
1 0 Reset (first run)
1 1 Reset (first run)
Example: max. limit = 9; min. limit = 0; Preset = 7.
An unwired clock input is set to value 1 internally. If both clock inputs go from 0 to 1 signal simultaneously, counting is
omitted. If one of clock inputs (up or down) are set from 0 to 1 signal, without the other one being already set to 1,
counting is omitted.
If parameters for the min. or max. limit are changed during operation, the counter can be out of this new range. In or -
der to prevent faulty functions, the counter must be set to a new, defined output status with ‘reset’ or ‘preset’. The
function has a ‘memory’. This means: after power-on, it continues operating with counter state and internal states at
power-off, provided that the RAM data are still unchanged.
9499-040-82711 Signal converters
COUN (up/down counter (No. 74)) III-120
>Tr
>Tr
reset
preset
Preset
down
up
Count
carry
borrow
&
&
&
y0
Mode
Min
0000
Max
9999
reset
Preset
up
down
carry
borrow
Count
0 7 8 9 0 1 2 1 0 9 8 7
Fig. 3 Pulse diagram of the up/down counter:
"up,down, carry und borrow" sind in inaktivem Zustand 1.