Banner MICRO-AMP Series - Manual (Page 11)

OUTPUT
INPUT
Pulse Pulse
Hold
OUTPUT
INPUT
Pulse Pulse Pulse
Functional Schematic, MA4-2 ONE-SHOT Module
Non-retriggerable one-shot logic:
Retriggerable one-shot logic:
There are two types of basic "one-shots": RETRIGGERABLE and NON-
RETRIGGERABLE. The output pulse timing of a retriggerable one-shot is re-
started with the reoccurance of every input. The output will remain "on" as
long as the time between consecutive inputs is shorter than the one-shot pulse
time (see timing diagram, below). A non-retriggerable one-shot timer must complete a pulse before it will
accept any new input signals. Non-retriggerable one-shots sometimes offer
an advantage in indexing or registration control applications where multiple
input signals are possible during advance of the product. The MA4-2 may
be programmed for the non-retriggerable mode by connecting pin #6 to pin
#8.
OUTPUT
INPUT
INHIBIT
Pulse Pulse
MICRO-AMP ® module MA4-2 is a plug-in one-shot logic module with adjustable pulse
length. It is designed as a way to easily add one-shot timing to a MICRO-AMP system which
uses an MA3 or MA3-4 amplifier. It may also be used to add a one-shot timer to any current
sinking DC device or to a system which offers a contact closure output.
A low-going logic INPUT signal at pin #7 of the module activates a one-shot output at both pins
#5 and #6, unless a low-going logic INHIBIT signal is present at pin #8 when the input occurs.
Both NORMALLY OPEN (pin #6) and NORMALLY CLOSED (pin #5) outputs are available.
Both are NPN open-collector (current sinking) transistors, each capable of switching up to 150
milliamps.
Three pulse duration time ranges are selectable. The .001 to .1 second range is standard, and
.01 to 1 second and 1 to 15 second ranges are selected by connecting the appropriate module
pin to pin #3 (dc common). The MA4-2 is a retriggerable-type one-shot, but may easily be programmed
to the non-retriggerable mode by connecting pin #6 (N/O output) to pin #8 (
INHIBIT input).
One-shot logic, MA4-2:
MICRO-AMP ® System
MA4-2 One-Shot Logic Module
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MICRO-AMP MA4-2 Specifications
SUPPLY VOLTAGE: 10 to 30V dc at less than 20 milliamps (exclusive of load); 10% maximum
ripple.
INPUTS: INPUT and INHIBIT both respond to a logic "low" signal (less than 2V dc). A logic "high"
is at least 6V dc or an open circuit. Inputs must be capable of sinking at least 4 milliamps. Inputs may be derived from limit switches or from
dc sensors with NPN (current sinking) output transistors.
RESPONSE SPEED: INPUT and INHIBIT will respond to a low signal or high signal of 1 millisecond duration or longer.
OUTPUT CONFIGURATION: two open-collector NPN transistors with complementary outputs (one normally open, one normally closed).
Maximum sinking current 150 milliamps, each output. Saturation voltage less than 0.5V dc at 10 milliamps. Off-state leakage current less
than 1 microamp.
PULSE DURATION: standard range is .001 to .1 second. Programmable ranges are .01 to 1 second and 1 to 15 seconds.
Select the .01 to 1 second range by connecting pin #2 to pin #3. Select the 1 to 15 second range by connecting #1 to #3.
TIMING ADJUSTMENT: single-turn timing potentiometer allows adjustment of pulse duration within the selected range (use small flat-
bladed screwdriver).
INDICATOR: red LED indicator on the top of the module lights whenever the N/O output is conducting (i.e. when the N/O output is closed
and the N/C output is open).
CONSTRUCTION: totally encapsulated plug-in package with molded VALOX ® housing. Gold-flashed connection pins.
OPERATING TEMPERATURE: 0 to 70 degrees C (32 to 158 degrees F).
Hookup Diagram, MA4-2 ONE-SHOT Module