180
1. BATTERY BACK-UP & DISPLAY LIGHT (L)
OPERATION
SC Counters can be operated from +12 VDC batteries
or power supplies.
(+12 VDC is connected to Term.
“A” and minus to “B”)
.
2. REMOTE RESET (R)
- Counter will be reset when this
input is pulled low
(to Term. “B”)
by a remote contact
or NPN O.C. output. Response time to Reset input is
2 µsec. Counter is ready to accept new counts 7.5
µsec after removal of reset.
(Front panel reset button
on all Models may be enabled or disabled via
configuration switch on rear.)
3. UP/ DOWN (U/D)
-
With U/D Terminal open, counters
increment
(count “UP”)
to increase the accumulated
number. When U/D is pulled low, the counter will
decrement
(count “DOWN”)
to decrease the
accumulated number. Response time to change count direction is 2 µsec.
Note: SC Counters count in complementary numbers when counting down
through zero, i.e. the counting sequence when decrementing is 3, 2, 1, 0,
999999, 999998, 999997, etc.
4. INHIBIT ( I ) -
Counter is inhibited from accepting
counts as long as
“I ”
is pulled low to Term.
“B”
.
Response time for initiation is 2 µsec, and release is 4
µsec.
5. OUTPUTS (Preset Counters)
- All SC Presettable
counters have 2 complementary outputs per preset
level
(Models SC2DU and SC2DD have two sets of
outputs, one set for each preset level)
.
SNK OUT
- Primary output for driving a relay coil. Output goes low to
energize relay at end of count cycle. This output is rated V
OL
= 0.6 V @
100 mA, V
OH
= 12 V max.
(Internal suppression diode limits V
OH
to +12
V internal supply and higher external supply cannot be used.)
SRC OUT
- Auxiliary output goes high at end of a count cycle. This output
is actually Bi-Polar, will source or sink 10 mA, and may be used for count
input to other counters or external electronic control circuits.
6. RESET-TO-PRESET (RTP) & RESET-TO-ZERO (RTZ) ACTION
SC Presettable Counters when Reset, return the counter either to zero or to
the Preset value
(Start Count)
as determined by the Reset Action.
MODEL SCP
- Fixed RTZ action
MODEL SCD
- Programmable for RTZ or RTP action
MODEL SC2DU
- Fixed RTZ action
MODEL SC2DD
- Fixed RTP action
Reset actions do not determine UP/DOWN count direction. Count direction
is controlled only by the U/Dterminal which must be connected to
“B”
when
down-counting is required.
SCP CONTROL INPUT/OUTPUT CONNECTIONS
NOTES:
Summary of Contents for CUB 1
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