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4
MODE 4 OUTPUT 1 TURN OFF AT PRESET 2, TIMED OUTPUT 2 AT PRESET 2,
AUTOMATIC RESET TO ZERO AT PRESET 2
In this mode, as the unit counts from zero, output 1 will turn on
when preset 1 is reached. When preset 2 is reached, output 2 will
turn on, output 1 will turn off, and the unit will automatically Reset
to Zero. Output 2 will turn off after its programmed time value has occurred.
Manual reset
✦
will turn off both outputs, if activated, and reset the count to
zero. During automatic reset, no counts will be lost as long as the count rate
does not exceed 2,500 cps.
MODE 5 TIMED OUTPUTS AT PRESETS, AUTOMATIC RESET TO ZERO AT PRESET 2
In this mode, as the unit counts from zero, output 1 will turn on
when preset 1 is reached and output 2 will turn on when preset 2 is
reached. The outputs will turn off after their respective
programmed time values have occurred. Also, when preset 2 is reached, the
unit will automatically reset the count to zero and start the cycle over.
(Output
2 will remain on until its time value has occurred.)
Manual reset
✦
will turn off
both outputs and reset the count to zero. During automatic reset, no counts
will be lost, as long as the count rate does not exceed 2,500 cps.
MODE 6 OUTPUT 1 TURN OFF AT PRESET 2, TIMED OUTPUT 2 AT PRESET 2,
AUTOMATIC RESET TO ZERO AFTER TIMED OUTPUT 2
In this mode, as the unit counts from zero, output 1 will turn on
when preset 1 is reached. When preset 2 is reached, output 2 will
turn on and output 1 will turn off. Output 2 will turn off after its
programmed time value has occurred. At the end of timed output 2, the unit
will automatically Reset to Zero and start the cycle over again. During
automatic reset, no counts will be as lost as long as the count rate does not
exceed 2,500 cps. Manual reset
✦
will turn off both outputs, if turned on, and
reset the count to zero.
MODE 7 TIMED OUTPUTS AT PRESETS, AUTOMATIC RESET TO ZERO AFTER TIMED
OUTPUT 2
In this mode, as the unit counts from zero, output 1 will turn on
when preset 1 is reached and output 2 will turn on when preset 2 is
reached. The outputs will turn off after their respective
programmed time values have occurred. At the end of timed output 2, the unit
will automatically Reset to Zero and start the cycle over again. During
automatic reset, no counts will be lost, as long as the count rate does not
exceed 2,500 cps. Manual reset
✦
will turn off both outputs, if turned on, and
reset the count to zero.
MODE 8 LATCH OUTPUT AT PRESET 1 AND ZERO, MANUAL RESET TO PRESET 2
✝
In this mode, as the unit counts from preset 2, output 1 will latch
on when preset 1 is reached and output 2 will latch on when zero
is reached. When a manual reset
✦
occurs, the unit will Reset to
Preset 2 and the output, if latched on, will unlatch. Counts will continue to
register after the outputs have turned on.
MODE 9 TIMED OUTPUT AT PRESET 1 AND ZERO, MANUAL RESET TO PRESET 2
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached and output 2 will turn on when zero is
reached. The outputs will turn off after their respective
programmed time values have occurred. When a manual reset
✦
occurs, the
unit will Reset to Preset 2. Manual reset will terminate the timed outputs, if
the outputs are still activated. Counts will continue to accumulate after the
outputs have activated.
✝
When down count is desired, (such as reset to preset modes of operation)
the “UP/DN” terminal must be tied to the “COMM.” terminal
.
✦
Manual reset, either by front panel reset (if enabled) or remote reset, is always
active, and will override any condition or state the counter is presently in.
MODE 10 OUTPUT 1 TURN OFF AT ZERO, LATCH OUTPUT 2 AT ZERO, MANUAL
RESET TO PRESET 2
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached. When zero is reached, output 2 will
turn on and output 1 will turn off. Output 2 will remain latched on
until a manual reset occurs. Counts will continue to accumulate after preset
levels have been reached. Manual reset
✦
will turn off all outputs if activated
and the unit Resets to Preset 2.
MODE 11 OUTPUT 1 TURN OFF AT ZERO, TIMED OUTPUT 2 AT ZERO, MANUAL
RESET TO PRESET
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached. When zero is reached, output 2 will turn
on and output 1 will turn off. Output 2 will turn off after its
programmed time value has occurred. Counts will continue to accumulate after
preset levels have been reached. When a manual reset
✦
occurs, the unit will
Reset to Preset 2. Manual reset will also turn off both outputs, if still activated.
MODE 12 OUTPUT 1 TURN OFF AT ZERO, TIMED OUTPUT 2 AT ZERO, AUTOMATIC
RESET TO PRESET 2 AT ZERO
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached. When zero is reached, output 2 will
turn on, output 1 will turn off, and the unit will automatically Reset
to Preset 2. Output 2 will turn off after its programmed time value has
occurred. Manual reset
✦
will turn off both outputs, if turned on, and reset the
count to preset 2. During automatic reset, no counts will be lost if the count
rate does not exceed 2,500 cps.
MODE 13 TIMED OUTPUTS AT PRESET 1 AND ZERO, AUTOMATIC RESET TO
PRESET 2 AT ZERO
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached and output 2 will turn on when zero is
reached. The outputs will turn off after their respective programmed
time values have occurred. Also, when zero is reached, the unit will
automatically reset the count to preset 2 and start the cycle over.
(Output 2 will
remain on until its time value has occurred.)
Manual reset
✦
will turn off both
outputs, if turned on, and reset the count to preset 2. During automatic reset, no
counts will be lost, as long as the count rate does not exceed 2,500 cps.
MODE 14 OUTPUT 1 TURN OFF AT ZERO, TIMED OUTPUT 2 AT ZERO, AUTOMATIC
RESET TO PRESET 2 AFTER TIMED OUTPUT 2
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached. When zero is reached, output 2 will
turn on and output 1 will turn off. Output 2 will turn off after its
programmed time value has occurred. At the end of timed output 2, the unit
will automatically Reset to Preset 2 and start the cycle over. During automatic
reset, no counts will be lost, as long as the count rate does not exceed 2,500
cps. Manual reset
✦
will turn off both outputs, if activated, and reset the count
to preset 2.
MODE 15 TIMED OUTPUTS AT PRESET 1 AND ZERO, AUTOMATIC RESET TO
PRESET 2 AFTER TIMED OUTPUT 2
✝
In this mode, as the unit counts from preset 2, output 1 will turn
on when preset 1 is reached and output 2 will turn on when zero is
reached. The outputs will turn off after their respective
programmed time values have occurred. At the end of timed output 2, the unit
will automatically Reset to Preset 2 and start the cycle over. During automatic
reset, no counts will be lost, as long as the count rate does not exceed 2,500
cps. Manual reset
✦
will turn off either output, if turned on, and reset the count
to preset 2.
MODES OF OPERATION FOR DUAL PRESET LIBRA COUNTER (Cont’d)
The selection of Input Set-up and Modes of Operation is accomplished by
eight DIP switches, located at the rear of the unit, in the upper right-hand
corner. DIP switches 1 to 3 are used to configure the input, and DIP switches 5
to 8 are used to determine the modes of operation. DIP switch 4 is used to
enable or disable the front panel reset button. The input set-up and reset enable
switches will be discussed first. Refer to the block diagram of the unit for the
details of count and control circuitry.
SWITCH SET-UP
S1 - SNK:
Provides a 7.8 K
Ω
pull-up resistor for sensors with sinking outputs.
SRC:
Provides a 3.9 K
Ω
pull-down resistor for sensors with sourcing
outputs.
S2 - HI FRQ:
Removes damping capacitor and allows operation up to 2.5 KHz.
Minimum count OFF times - 50 µsec.
LO FRQ:
Connects damping capacitor for switch contact debounce. Limits
count speed to 100 Hz. Minimum count pulses ON/OFF times - 5 msec.
S3 - HI BIAS:
Sets input trigger levels at mid-
range to accept outputs from 2-wire
proximity sensors, resistive photo-cells,
and logic pulses with full 0 to +12 V
swings. (V
IL
= 5.5 V, V
IH
= 7.5 V)
LO BIAS:
Sets input trigger levels to the
low range to accept logic pulses with 0 to 5
V swings. (V
IL
= 1.5 V, V
IH
= 3.75 V)
S4 - DIS RST:
Disables front panel reset.
EN RST:
Enables front panel reset.
SELECTION OF INPUT SET-UP & MODES OF OPERATION
LIBC-j.QXD 10/26/04 10:52 AM Page B4
