Gemini 4100 User manual
THE ASTRO LINE SERIES
GEMINI 4000 INSTRUCTION MANUAL
INTRODUCTION
The Gemini 4100 and 4200 are both units in a multi-purpose series of
industrial control units that are field-programmable to solve multiple
applications. This series, known as the Astro-Line family of products, is built
around the concept that the end user has the capability to program different
personalities and functions into the unit in order to adapt to different indication
and control requirements.
The Gemini, which you have purchased, has the same high quality
workmanship and advanced technological capabilities that have made Red Lion
Controls the leader in today's industrial market.
Red Lion Controls has a complete line of industrial indication and control
equipment, and we look forward to being of service to you now and in the future.
CAUTION: Risk of Danger.
Read complete instructions prior to
installation and operation of the unit.
CAUTION: Risk of electric shock.
TABLE OF CONTENTS
I. GENERAL DESCRIPTION 2
A) Safety Summary 2
B) Programming The Gemini 3
C) Programming The Personality 3
D) Programming The Presets, Scale Factors, Timed Outputs & Counter Load Values 3-5
E) Initial Factory Configuration Counter/Rate & Dual Counter Factory Settings 6
F) Operator Accessible Functions With Programming Disabled 7
G) Diagnostics, Self-Test, & “Watchdog” Timer 7-8
H) Input Circuitry & Set-up 8
I) Overflow Indication 8
II. PROGRAMMING INSTRUCTIONS FOR THE COUNTER/RATE VERSION OF THE GEMINI 9
A) Codes 41, 42, 43, 44, 45, & 46, 51, 52, 53, 54, 55, & 56 9-14
B) Codes 61, 62, 63, 64, 65, 66, Preset Values, Scale FactorsA&B,Counter Load Value 15-17
C) Dual Preset Counter & Rate Application 18-19
III. PROGRAMMING INSTRUCTIONS FOR THE DUAL COUNTER VERSION OF THE GEMINI 20
A) Codes 41, 42, 43, 44, 45, & 46 20-22
B) Codes 51, 52, 53, 54, 55, & 56 22-25
C) Codes 61, 64, 65, 66, Preset Values, Scale FactorsA&B,Counter Load Values 25-27
E) Dual Counter Batching Application 28-29
IV. 20 MA CURRENT LOOP COMMUNICATIONS 30
A) Communication Format 30
B) Sending Commands & Data To The Gemini 30-32
C) Receiving Data From The Gemini 32
D) Print Options 33
E) Current Loop Installation 34
F) Communications Application 35
G) Troubleshooting Gemini Serial Communications & Serial Loop-Back Self-Test 36
V. APPENDIX “A” - INSTALLATION & INPUT CONFIGURATION SWITCH SET-UP 37-45
VI. APPENDIX “B” - SPECIFICATIONS & DIMENSIONS 46-47
VII. APPENDIX “C” - TROUBLESHOOTING GUIDE 48-49
VIII. APPENDIX “D” - COUNTER/RATE & DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY 50-57
IX. APPENDIX “E” - SCALING FOR COUNTING 58-59
X. APPENDIX “F” - SCALING FOR RATE 60-61
XI. APPENDIX “G” - GEMINI 4100 PROGRAMMING CHARTS 62-64
XII. APPENDIX “H” - GEMINI 4200 PROGRAMMING CHARTS 65-69
XIII. APPENDIX “I” - ORDERING INFORMATION 70
GENERAL DESCRIPTION
The Gemini 4000 series (4100 & 4200) instruments are two input
microprocessor based dual function counter/rate or dual counter instruments.
The 6-digit display features 0.56" high LEDs with negative sign, overflow and
displayed value indicators (A & B) located to the left of the display. When
programmedasacounter/rateinstrument,theAindicatorwillbeonwhentherate
is displayed and the B indicator will be on when the count is being displayed.
Pushing the “+/-” button toggles the display between the counter and rate or the
two counters depending on the personality selected.
TheGemini4000series consistsoftwobasic units,asingle presetversion,the
Gemini 4100, and a two preset version, the Gemini 4200. Each basic unit is also
availablein115/230VACversions,withorwithoutSerialcommunicationsanda
relay board. The 20 mA current loop option (serial communications) makes
possible remote or computerized monitoring or control of the Count, Presets and
Scale Factors.
Flexibility and usefulness are insured through user programmability. With
simplefrontpanel keystrokesand rearpanelswitch settings,anyoneofa number
of configurations can be selected. Once the selection is made, all or part of the
keyboard can be disabled to protect the settings and guarantee that no unwanted
changes can occur during the measurements.
Eachtimethepower isturnedoff, theunitautomaticallysavesthe settingsand
data in its special no power memory. When power is restored, the Gemini sets
itself back to the operational modes and restores the data it had at power down.
The “no power” E2PROM’s life expectancy is at least 100,000 cycles of power
being applied to and removed from the unit.
Whenever the power comes on, the Gemini performs a series of internal
diagnosticsto verifytheintegrity ofthestored data.Thereis alsoaself-testmode
and a “watchdog” timer to help prevent processor lockup.
The Gemini 4000 series counters can accept bi-directional, uni-directional, or
quadrature signals. They also have the capability to double or quadruple
(Quadrature x4) the resolution of the incoming count signal. A separate input
mode is available to make the counter/rate or dual counters completely
independent of each other.
Oneinputprovides the signalforrateor a counterandthe other inputprovides
the signal for a counter. An anti-coincidence add/subtract mode is also provided
to obtain a difference between two input signals.
Each channel features separate scaling and decimal point placement for
readout in different units or at different resolutions.
A Counter Load feature enables the operator to modifythe count value under
circumstances that occur when flawed material has been counted and it is
necessarytoadjustthecountvalueaccordingly.TheCounterLoad featurecan be
“locked out” in applications where it is not required.
The Rate Indicator portion uses a time interval method (1/tau) to calculate the
rate value. This method enables high resolution at all rates. The unit counts input
pulses and after a programmable minimum update time has occurred, it waits
until the next edge occurs, takes the elapsed time and number of edges, and
calculates the rate value. At slower rates, averaging can be accomplished by
programming the “Rate Minimum Update Time” (0.5 sec. to 16 sec.) for the
desired response. Extensive scaling capabilities allow practically any desired
reading at very slow count rates.
For maximum flexibility, the Gemini’s output(s) can be assigned to either the
rate or count channels or one to each. When in dual counter mode, the output(s)
can be assigned to the Counter B channel. For the Gemini 4200, one can be
assigned to Counter A and the other to Counter B.
The relay(s) are mounted on a plug-in board which makes it easy to field
upgradeyourGemini.Thecontactsareratedfor240VACor28VDCat5amps.
The construction of the Gemini features a metal, die cast bezel for maximum
durability with high quality appearance. The sealed front panel meets NEMA
4/IP65 specifications for washdown and/or dust, when properly installed.
Electrical connections are made with removable, plug-in terminal strips at the
rear of the unit. Clamp-type pressure plate terminals accept stripped #14 AWG
wire without lugs.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in the
manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
Donotuse this unit todirectlycommandmotors,valves, or otheractuatorsnot
equipped with safeguards. To do so, can be potentially harmful to persons or
equipment in the event of a fault to the unit.
PROGRAMMING THE GEMINI
When your Gemini arrives from the factory, it has already been programmed
to function as a counter and rate indicator. It is programmed with the factory
settings listed in the “Initial Factory Configuration” section. If it is required to
have the unit operate as two counters, the Unit Personality function code can be
changedtodoso.
The personality, functions, and modes are accessed by pressing the appropriate
keys.Afunctionisdefined bya two-digitcodewhichappearson theleftside ofthe
display. The mode of that function is shown as a one-digitcode on the right side of
the display. At times there will be a “-” sign modifier to the left of the mode.
Data for the Presets, Scale Factors, Timed Output Values, and Counter Load
Values are entered differently. Each digit key controls the digit on the display
directly above it. Changing the digits can be done by repeatedly pressing the key
beneaththe digitposition youwishto changeor byholding thekeydown.Asyou
holdit down,orrepetitively pressit,the valueofthat digitwillchange cyclically,
countingupto9,thento0,andthenupagain.The6numberedkeyscorrespondto
the six digits, and the “+/-” key corresponds to polarity.
PROGRAMMING THE PERSONALITY
Entering function and mode is easily accomplished by
pressingthe appropriatedigit key.Forthepersonalityfunction,
you would enter 41 by pressing the front panel keys 4 and 1.
Thedigits on theleftside of thedisplay showthefunction
code; the digits on the right side show the current
programmed mode.
A mode selection is made by entering a new number. On
some of the entries, you have the option of a plus “+” or minus
“-” sign. In the cases where a “+” sign is required, no sign will
be displayed. If you do enter a “-” sign (using the “+/-” key), a
minus sign will be displayed in front of the appropriate digit.
Pressing the “E” key finalizes the change. The display
will now show the count or rate value immediately.
If you do not press the “E” key, the change will not be
recorded.Thedisplay will remainin the programmingmode
for 15 seconds, and then return to normal operating mode
using the old functional mode setting.
Whenever the Unit Personality is changed, the factory settings will
automatically be loaded into the unit. The factory settings can also be
programmedinto theunitbycalling up theUnitPersonality, puttinga“-”in front
of the mode by pushing the “+/-” button, and entering it.
Refer to the “Initial Factory Configuration” section for more details.
PROGRAMMING THE PRESET, SCALE FACTORS, TIMED
OUTPUTS & COUNTER LOAD VALUES
The Presets and Scale Factor Values are commonly reprogrammed on a daily
basis. As such, single keystroke access has been provided.
The Gemini has two Scale Factors, one for display A
(Counter A or Rate A), and one for display B (Counter B).
Pressing the “3” key will call up the Scale Factor for the
current display (Rate A/Counter A, or Counter B).
To call up the “other” Scale Factor, the “+/-” key is first pushed to change the
displaytothe“other”value,thenthe“3”keyispushedto displaytheScaleFactor
for that value.
PROGRAMMING THE PRESET, SCALE FACTORS, TIMED
OUTPUTS & COUNTER LOAD VALUES (Cont’d)
Once the Scale Factor is displayed, changing the digits
canbeaccomplishedby repeatedly pressing the key beneath
the digit position you wish to change or by holding the key
down, allowing the digit to cycle.
The new value will be entered when the “E” key is
pressed.
The internal count value is multiplied by the Scale Factor Value, which
changesthe displayed valueaccordingly.It isimportanttonotethat theprecision
ofanapplicationcannotbeimprovedbyusing aScaleFactorgreaterthanone.To
accomplish greater precision, more pulse information must be generated per
measuring unit. For example, if 5 pulses are being received per foot of material,
the precision of 10th of feet cannot be attained by simply programming a Scale
Factor of 2.0000, even though the display is reading in tenths. In this case, the
display will increment by two for each count input. Thus, if an odd Preset Value
is entered, such as 6.7 ft., the Gemini will alter the Preset display to read in even
tenths of feet.
To display the Preset 1 Value the “1” key is pushed.
To change the value, the digits can be cycled through in
the same manner as discussed for the Scale Factor. The
preset values can range from -999999 to +999999.
The new value will be entered when the “E” key is
pressed.
The Scale Factor Value will have a direct effect on the preset being entered (if
assigned to the counter). For Scale Factors greater than one, the preset value
should be an integer multiple of the Scale Factor. If it is not, the Gemini will
automatically adjust the preset value up or down to force it to be evenly divisible
by the Scale Factor.
The Timed Output 1 or 2 Value is changed by entering a
two-digit function code. After the code is entered, the
display will show the present Timed Output Value in
seconds with two decimal place resolution. The Timed
Output Values can be set from .01 to 599.99 seconds.
Tochange the TimedOutput 1 Value,enterfunction code
53 and enter the new value by holding down or repeatedly
pressingthekeybelowthedigitpositionyouwishtochange.
The new value will be entered when the “E” key is pressed.
The display will immediately return to the count value.
Note: A Timed Output Value of zero cannot be programmed into the Gemini. If a
value of 0 is entered into the display and the “E” key is pressed, the unit will
remain in data entry mode. If a new value is not entered, it will time out and the
unit will continue to use its previous setting.
As with the other functions, you must press “E” to record the changes. For the
data entry modes, if you do not press the “E” key,a time out of 5 seconds occurs,
and the display returns to operating mode without anychanges to the value. The
only time any change will occur is when the “E” key is pressed.
It is possible to change the counter values of the Gemini. This feature can be
enabled or disabled by the programming of the “Operator Accessible Functions
Modes”,function code66.The“CounterLoad Value”isnot storedwhen theunit
ispowered down. Whentheunit is poweredup,the CounterLoadvalues for both
counters(ifDualcounter personality) are resettozero.Oncechanged, the values
will be held until the unit is again powered down.
Toaccessthe Counter Load valueforthedesired counter;
first, press the “+/-” key, if necessary, so that the display is
indicating the counter value which is to be changed.
Secondly, press the “E” key and while holding it down,
press the “+/-” key.
TheGeminiwill nowdisplaythedisplayed Counter Load
value. (It will be zero, unless the value had been changed
since the unit was powered up.)
To change the value, press the key under the digit to be
changed as explained previously for the Preset.
To load the value into the counter, press the “E” key.
The display will flash momentarily and will display the
counter with the new value.
INITIAL FACTORY CONFIGURATION DUAL COUNTER FACTORY SETTINGS*
Keys struck Display Description
4,1 41 2 Personality selected as DUAL COUNTER
4,2 42 3 Reset Counters A & B
4,3 43 1 Count with Inhibit
4,4 44 1 Single edge counting (A & B)
4,5 45 1 Counter B Scale multiplier of 1.0
4,6 46 1 Counter B leading zero blanking and no decimal point
5,1 51 2 Outputs 1 & 2 assigned to Counter B
5,2 52 3 Output 1 terminates at Reset, Normal Phase.
5,3 0000.10 Timed Output 1 Value of 0.1 Sec
5,4 54 3 Output 2 terminates at Reset, Normal Phase.
5,5 0000.10 Timed Output 2 Value of 0.1 Sec
5,6 56 1 Counter B, manual reset to zero
6,1 61 1 Counter A, manual reset to zero
6,4 64 1 Counter A scale multiplier of 1
6,5 65 1 Counter A leading zero blanking, no decimal point
6,6 66 1 No functions except Reset enabled
3 01.0000 Scale Factor A set to 1.0000
3 01.0000 Scale Factor B set to 1.0000
1 000500 Preset 1 set to 500
2 001000 Preset 2 set to 1000
* If [41 1] is changed to [41 2], then the factory settings are as shown.
Keys struck Display Description
4,1 41 1 Personality selected as COUNTER/RATE
4,2 42 3 Reset Rate (A) Output(s) & Counter (B)
4,3 43 1 Count with Inhibit
4,4 44 1 Single edge counting (B)
4,5 45 1 Counter B Scale multiplier of 1.0
4,6 46 1 Counter B leading zero blanking and no decimal point
5,1 51 2 Outputs 1 & 2 assigned to Counter (B)
5,2 52 3 Output 1 terminates at Reset, Normal Phase
5,3 0000.10 Timed Output 1 Value of 0.1 Sec
5,4 54 3 Output 2 terminates at Reset, Normal Phase
5,5 0000.10 Timed Output 2 Value of 0.1 Sec
5,6 56 1 Counter (B), manual reset to zero
6,1 61 4 No Rate (A) right hand dummy zeros
6,2 62 1 Rate per Second
6,3 63 1 Rate (A) 0.5 Sec Minimum Update Time
6,4 64 4 Rate (A) Scale multiplier of 1
6,5 65 1 Rate (A) leading zero blanking, no decimal point
6,6 66 1 No functions except Reset enabled
3 01.0000 Scale Factor A (Rate) set to 1.0000
3 01.0000 Scale Factor B (Counter) set to 1.0000
1 000500 Preset 1 set to 500
2 001000 Preset 2 set to 1000
OPERATOR ACCESSIBLE FUNCTIONS WITH
PROGRAMMING DISABLED
(For details on keyboard entry, see preceding section)
One of the important features of the Gemini is the ability to disable
programming. With this ability, accidental bumping of the keys or tampering by
unauthorizedpersonnelcan be prevented.However,it maybe necessarytoallow
resetandcertainprogrammingfunctions,suchasPresetandScaleFactorValues,
to be changed in daily operation. The Gemini, through the use of the “Operator
Accessible Functions” Modes can enable these functions even when the “PGM.
DIS.” (Program Disable) terminal is connected to “COMMON”.
The “Operator Accessible Functions” modes are programmed by entering a
two-digit function code (66) and the desired mode. Unlikeother function codes,
the mode does not take effect immediately. The “PGM. DIS.” terminal must be
connected to “COMMON” in order for the Gemini to disable programming and
operate as per the mode programmed.
There are six basic “Operator Accessible Functions” Modes available. These
modes enable the following functions.
1. NO FUNCTIONS EXCEPT RESET ENABLED - In this mode, manual
reset is enabled, but none of the programming functions can be changed.
However, the functions can be interrogated.
2. PRESET PROGRAMMING AND RESET ENABLED - Theentirefront
panel is disabled with the exceptions of Preset programmability and manual
reset. All functions can be interrogated.
3. SCALE FACTOR PROGRAMMING AND RESET ENABLED - The
entire front panel is disabled with the exceptions of Scale Factor
programmability and manual reset. All functions can be interrogated.
4. SCALE FACTOR AND PRESET PROGRAMMING, AND RESET
ENABLED - The entire front panel is disabled with the exceptions of Scale
Factor and Preset programmability, and manual reset. All functions can be
interrogated.
5. PRESET AND COUNTER LOAD PROGRAMMING, AND RESET
ENABLED - The entire front panel is disabled with the exceptions of Preset
and Counter Load programmability. All functions can be interrogated.
6.PRESET,SCALEFACTORAND COUNTER LOAD PROGRAMMING,
AND RESET ENABLED - The entire front panel is disabled with the
exceptions of Preset, Scale Factor and Counter Load programmability. All
functions can be interrogated.
All of these modes can be modified with the addition of a “-” sign. The minus
sign disables the manual reset, at the front panel and the remote reset (RST., not
RST.A) terminal, at the rear of the unit.
Thereisalso arearpanelDIPswitchwhichpermitsdisablingofthefrontpanel
reset button. This is independent of the rear terminal remote reset, and can be
used in conjunction with any front panel disable mode. The combination of a
manual and remote reset inputs provides a high level of security without
sacrificing flexibility.
DIAGNOSTICS, SELF-TEST, & “WATCHDOG” TIMER
The security of the Gemini is further enhanced by its self-test diagnostic and
“watchdog” timer capabilities.
The diagnostics are concerned with the special, no power memory of the
Gemini. Whenever the power is turned off, all pertinent function settings and
measurements (except the Counter Load values) are automatically saved. When
power is restored, the functions and data are re-instated. This allows you to
program the unit once and not have to re-program it until you wish to use it in
another mode.
When the function codes and data are saved, computations are made with
thesevalues.Theresult of these computationsisstoredinthememoryto serve as
a check against possible error. On power up the same computations are repeated
on the stored data. If the results do not agree with the stored results, a “P” will
appearontheleftsideof thedisplay.Ifthisoccurs,refertothe“Troubleshooting
Guide” for directions.
DIAGNOSTICS, SELF-TEST, & “WATCHDOG” TIMER [Cont’d]
Another error indicator is the “watchdog” timer. In order to insure the
software is functioning properly, the program constantlymonitors itself. If the
proper sequence and timing of internal events does not occur, an “E”will appear
onthe leftside ofthedisplay.If thisoccurs,referto the“TroubleshootingGuide”
for directions.
The final type of built-in error checking is the front panel initiated self-test. It
can be performed at any time, even when the Gemini is running. It will not
interferewiththeaccumulationofcountsorcontrolfunctions.Afunctioncodeof
“6”, “+/-” starts the test. At this time, whatever was displayed will disappear and
be replaced by a string of decimal points and the overflow indicator. Then the
displaywillshowa string of9’s,then8’setc.,untilastringof 0’s are shown. The
self-test will then turn off the overflow indicator and activate the minus “-” sign.
Then the unit shows an interlace pattern of -010101, then -212121, followed by
232323 etc., until -898989 is reached. At this time the outputs can be tested by
pressingthe“1”or“2” key. (Theprogramdisable terminalmustbedisconnected
in order to allow activation of the outputs. Also, when testing the output, use
caution, so as not to cause any undesirable or hazardous conditions in the
system.)An automatic exit will take place aftersix seconds or immediately if the
Program Disable terminal is connected to common. Normal length of display
time for each of the patterns is approximately 0.5 sec. Rapidly pressing “E”
during self-test can speed up the sequence.
INPUT CIRCUITRY & SET-UP
There are two independent input channels on the Gemini. Various types of
sensor outputs can be accommodated by appropriate DIP switch set-up. These
include: TTL or CMOS logic, current sinking, current sourcing, or dry contact
and more.
Channel 1 consists of a logic input and a separate low level magnetic pickup
input.
Channel 2 is a completely independent count or control input channel. Like
Channel 1, it can be programmed with DIP switches for a wide variety of logic
inputs, and is identical to Channel 1 in this regard. For a complete detailed
description of input set-up, see Appendix “A”.
OVERFLOW INDICATION
The Gemini features an overflow indicator (LED) which is located to the left
of the sixth digit and above the polarity annunciator.This LED will turn on if the
capacity of the display (6-digits) is exceeded or if the internal count capacity
(9-digits) is exceeded. Use of extremely small scale multiplier and Scale Factor
Values can cause the internal count capacity to overflow before the displayed
valuewould overflow. Itshould also benotedthatthe use ofRightHand Dummy
Zeros or Scale Factors larger than one could cause the displayed value to
overflow before a value of 999,999 (6-digits) is accumulated.
When the capacity of the display is exceeded, the count value will be
maintainedandwillbevalid.But iftheinternal countvalue isexceeded,then this
value may no longer be valid.
The overflow LED can also turn on under certain conditions when the rate
input frequency exceeds the maximum3250 cps allowed for a rate update period
of 16 sec. See Code 63 - “Rate Minimum Update Time”.
PROGRAMMING INSTRUCTIONS FOR THE COUNTER/RATE VERSION OF THE GEMINI 4000
The first part of this section provides detailed descriptions of the function
command codes for inputs response modes, reset modes, output terminations,
etc.Then, using an actualapplicationexample,theprogramminginstructionsfor
a Counter/Rate version will be “walked through”, to give the user a full
understanding of the Gemini programming procedure. The descriptions below
give the function command code first, followed by the individual mode
identifier. The Function Command Code Summary in the appendix, lists all
codes. (Only commands and modes pertaining to the Counter/Rate personality
will be discussed in this section.)
CODE 41 - UNIT PERSONALITY
The Gemini can be programmed to operate in one of two different
personalities. In each of the two unit personalities, the Gemini operates as a dual
function indicator. The personality selected determines whether display channel
A will indicate rate or count. In both personalities, display channel B operates as
a counter.
When the Unit Personality is changed and entered, all modes and data values
(Preset, Scale Factors, function codes etc.) will be automatically loaded with the
factory settings for that personality. If, for any reason during programming, it is
desired to return to the factory settings (while in code 41), the “+/-” key can be
pushed. When the “E” key is pressed the unit will load the factory settings into
the Gemini.
The programming procedure will vary for the two unit personalities. This entire
section deals with the unit programmed as a Counter/Rate indicator, [41 1].
[41 1]COUNTER(B)/RATE(A)-Inthismode,displaychannelAfunctionsas
a rate indicator and display channel B functions as a counter. See the
“PROGRAMMING INSTRUCTIONS FOR THE GEMINI 4000” section
for details.
[41 2]DUAL COUNTER-Inthismode,both displaychannels,A&B, function
as counters.
CODE 42 - RESET BUTTON & TERMINAL ACTUATION MODES
The “Reset Button & Terminal Actuation Modes” controls the affect that the
reset button and terminal have on the two display channels. Resetting will not
affect the rate display in any manner. If the output(s) is assigned to the rate
channel, activating the reset button or terminal will reset the rate output(s) if that
particularresponsemodeisprogrammed.Resettingcounter (B)will alwaysreset
the assigned output(s).
There is a separate “RST. A” terminal, which resets the Rate (A) output when
activated (if output(s) is assigned to rate). It is provided to allow independent
resetting of each channel.
[42 1] RESET RATE (A) OUTPUT(S)
[42 2] RESET COUNTER (B)
[42 3] RESET RATE (A) OUTPUT(S) AND COUNTER (B)
CODE 43 - INPUTS1&2RESPONSE MODES
The Gemini has six different input response modes. They are: Count(1) with
Inhibit(2); Count(1) with Up/Down Control (2); Two input anticoincidence
Add(1)/Subtract(2); Separate Input mode; Quadrature; and Quadrature x4. In all
modes, except [43 4], Input 1 is used by both the counter and rate channels.
[43 1]COUNT WITHINHIBIT-Input1servesasthecountand rateinput.Input
2 serves as the Inhibit input. When Input 2 is low, the counter will ignore the
count signal appearing at Input 1. The rate channel, however, will continue to
indicate the rate of the signal on Input 1.
WhenInput2 isatahighlevel,thesignalappearingonInput1willbecounted.
The “Counter (B) Reset Modes” will determine the count direction. In
applications where the Inhibit function is not actually used, the Input 2
“SRC/SNK” position of the “INPUT CONFIGURATION DIP SWITCH”
should be set to the “SNK” position to provide a 7.8 Kohm pull-up resistor.
This will set Input 2 to the Non-Inhibit state.
CODE 43 - INPUTS1&2RESPONSE MODES [Cont’d]
[43 2] COUNT WITH UP/DOWN CONTROL - In this mode, count direction
canbecontrolledbythesecondinput.Input1servesasthecountandrateinput
and Input 2 serves as the direction control signal input. When Input 2 is at a
highlevel,thecounterwillcountup.WhenInput2isatalowlevel,thecounter
will count down. The rate is not affected by the directional control Input 2.
[43 3] TWO INPUT ANTI-COINCIDENCE ADD/SUBTRACT - This mode
effectively separates count pulses which may simultaneously appear at the
two inputs. The Gemini unit processes the count pulses into a string of
time-separated pulses, so the internal counter will not lose any count pulses.
Input 1 serves as the add and rate input (count increments) and Input 2 serves
as the subtract input (count decrements).
[43 4] SEPARATE INPUT - In this mode, the two functions, Counter (B) and
Rate(A)are independently controlled by the inputs. Input 1 serves as the Rate
(A) input and Input 2 serves as the Counter (B) input.
[43 5] QUADRATURE COUNTING - Quadrature counting modes are
primarilyusedinpositioningandanti-jitterapplications.Thereasonthismode
works is due to the manner in which two pickups are positioned relative to
each other. The signal on Input 2 is a pulse train signalshifted 90° away from
theInput1signal.ThesetwosignalsareprocessedbytheGeminiasfollows:
Input 1 serves as the count and rate input, while Input 2 serves as the
quadrature input. For quadrature with single edge counting, the counter will
count in a positive direction when Input 1 is a negativegoing edge and Input 2
is at a low level. The counter will count in a negative direction when Input 1 is
apositivegoingedge andInput2isatalowlevel.Alltransitionson Input1 are
ignored when Input 2 is at a high level. These logic rules provide the basis for
anti-jitter operation which will prevent false counts from occurring due to
back-lash, vibration, chatter, etc.
When two edge counting is used, the quadrature mode works the same as with
single edge counting when Input 2 is low.But when Input 2 is at a high level,
counts at Input 1 are no longer ignored. Instead the logic rules for Input 1 are
complemented, allowingbothedgesof Input1tobe counted.Thisdoubles the
effective resolution of the encoded input. The rate indicator will only use the
falling edge of the Input 1 signal, due to the method of rate indication used.
[43 6] QUADRATURE TIMES 4 - This mode takes the quadrature mode, with
two edge counting, one step further. In quadrature times 4, both Input 1 and
Input 2 serve as the count orquadrature input, depending on their state. In one
instance, Input 1 will serve as the count input and Input 2 will serve as the
quadrature input. In another instance, Input 1 will be the quadrature input and
Input 2 will be the count input. This enables each edge, positive and negative
going, of both inputs, 1 and 2, to be counted. This results in a resolution four
times greater than in the basic quadrature x1 mode. As in the other modes,
Input 1 is also used for the rate input. The rate indicator will only use the
falling edge of the Input 1 signal, due to the method of rate indication used.
CODE 44 - COUNTER (B) NUMBER OF COUNT EDGES
The counter of the Gemini can be programmed for either single or two edge
(x2) counting. The number of count edges cannot be set when the count mode is
programmed for quadrature x4 operation. The Gemini will ignore any attempt to
enter function command code 44 when set for quadrature x4.
[44 1]SINGLEEDGE COUNTING(x1)-Theunit countsonthe negativegoing
(falling) edge of the count input signal. The count mode descriptions describe
how each mode uses this method of edge counting.
[44 2] TWO EDGE COUNTING (x2) - This mode is used when doubling of the
count signal input is required. The unit counts on the positive going (rising)
edge of the count input signal, as well as, the negative going (falling) edge.
CODE 45 - COUNTER (B) SCALE MULTIPLIER
Thereare fourCounter BScaleMultipliers thatare available.Theyeffectively
divide the internal Count B value by 1, 10, 100, and 1000 respectively, to yield
the displayed Counter B value. Note: Use of a small scale multiplier in
conjunction with a small Scale Factor could cause the internal count value to be
exceeded before the 6-digit display value is exceeded. See “Programming the
Presets, Scale Factors, Timed Outputs & Counter Load Values” section for
more details.
[45 1] x1
[45 2] x0.1
[45 3] x0.01
[45 4] x0.001
CODE 46 - COUNTER (B) DECIMAL POINT & LEADING
ZERO BLANKING
There are six basic modes of decimal point placement for the counter of the
Gemini. The decimal point is placed to the right of the display digit that
corresponds to the mode identifier. (The right most decimal point, digit 1, is
never turned on.) A “-” sign in front of the mode identifier will inhibit leading
zero blanking. The absence of a “-” sign will enable leading zero blanking.
[46 1] 0
[46 2] 0.0
[46 3] 0.0 0 LEADING ZERO
[46 4] 0.0 0 0 BLANKING
[46 5] 0.0000
[46 6] 0.00000
[46 -1] 000000
[46 -2] 00000.0
[46 -3] 0 0 0 0.0 0 LEADING ZERO
[46 -4] 0 0 0.0 0 0 BLANKING INHIBITED
[46 -5] 00.0000
[46 -6] 0.00000
CODE 51 - OUTPUT ASSIGNMENT
The output(s) of the Gemini 4000 can be assigned to either the rate or count
channel. Assigning the output(s) to the rate [51 3] will automatically configure
the “Counter (B) Reset Mode” to Reset to Zero, [56 1].
The Gemini 4200 has a Preset tracking feature which allows Preset 1 to track
Preset 2. If Preset tracking is programmed, whenever the Preset 2 value is
changed, the Preset 1 value will also change to maintain the same offset. For
example, if Preset 1 is 100 and Preset 2 is 200, changing Preset 2 to 300 will
automatically changePreset 1 to 200, maintaining same 100 unit offset. In order
tochangethe amountofoffset,thePreset1 value is changed. ThePresettracking
feature is programmed by adding a “-” modifier in front of the desired mode.
[51 1] OUTPUT 1 ASSIGNED TO RATE (A), OUTPUT 2 TO COUNTER
(Gemini 4200 only)
[51 2] OUTPUTS 1 & 2 ASSIGNED TO COUNTER (B)
[51 3] OUTPUTS 1 & 2 ASSIGNED TO RATE (A)
[51 -1]
[51 -2] These modes are identical with the exception
[51 -3] that Preset Tracking is enabled.
CODE 52 - OUTPUT 1 TERMINATION MODES
The Gemini has six “Output 1 Termination Modes” which control the way
Output 1 will terminate or reset. In all modes, Output 1 will terminate
immediately when the channel to which it is assigned is manually reset.
FortheGemini4200, the Output 1 terminationmodes 1 & 2 areavailableonly
when both outputs are assigned to the Counter (B), [51 2].
A reverse phase mode is available on the Gemini. This refers to the
complementing of the logic state of the output. With normal phase operation,
when the display value reaches Preset 1, Output 1 will turn on. The reset
conditionofOutput1 is output off. Inreversephaseoperation, Output 1turnsoff
when the Preset 1 Value is reached. The reset condition of Output 1 is output on.
(Note: The state of the relay, if used, is also reversed.) A “-” sign in front of the
mode identifier will provide for reverse phase operation. The absence of a “-”
sign will indicate normal phase operation.
CODE 52 - OUTPUT 1 TERMINATION MODES (Cont’d)
[52 1] TERMINATE AT OUTPUT 2 START - Output 1 will terminate when
Output2starts.Output1issetfornormalphaseoperation.(Gemini4200Only)
[52 2] TERMINATE AT OUTPUT 2 END - Output 1 will terminate when
Output2ends.Output1issetfornormalphaseoperation.(Gemini4200Only)
[52 3] TERMINATE AT MANUAL RESET - Output 1 activates when the rate
or count, whichever it is assigned to, is greater than or equal to the Preset 1
Value. In this mode, onceOutput 1 is activated, it does not deactivate until the
moment a reset occurs. Output 1 is set for normal phase operation.
[52 4] TERMINATE AT MANUAL RESET END - This mode is like the
preceding, except Output 1 deactivates when reset ends. Output 1 is set for
normal phase operation.
[52 5] TERMINATE AFTER TIMED OUTPUT 1 - Once Output 1 has been
activated, it will deactivate after the predetermined length of time (code 53)
has expired. Manual reset will override the timed output and reset Output 1.
Output 1 is set for normal phase operation.
When Output 1 alone is assigned to the rate [51 1], the output will activate
whentherateisgreaterthanorequaltothePreset1Value.Whenbothoutputs
areassigned to Rate[51 3],Output 1willact as an“underspeed”detect. Itwill
activate when the rate is less than or equalto the Preset 1 Value. Output 1 will
activate every update time period for which the above conditions are true. If
the Timed Output 1 Value, code 53, is greater than the rate update time, the
outputwillappearto belatched on,deactivating whentheratedropsbelowthe
Preset and the output time expires.
[52 6] BOUNDARY MODE - When in boundary mode, the Preset 1 Value
serves as the boundary point. When the display value (count or rate) is less
than the Preset 1 Value, Output 1 is not activated (normal phase). When the
display value is greater than or equal to the Preset 1 Value, Output 1 is
activated. If the display value were to drop below Preset 1, Output 1 would
then deactivate. For negative Preset points, Output 1 is notactivated when the
count value is more positive than the Preset 1 Value. When the count is more
negative than (only possible with counter) or equal to Preset 1, Output 1 is
activated. If the count becomes more positive than the Preset 1 Value, the
output again deactivates. When Output 1 is assigned to the counter and the
Preset 1 value is changed, Output 1 will immediately go to the proper state.
Uponpowerup,Output1,ifassignedtoCounterB,will“remember”itspower
down boundary condition and go to that state. Output 1 is set for normal
phase operation.
[52 -1]
[52 -2]
[52 -3] These modes are the same as above with the exception
[52 -4] that the output is set for reverse phase operation.
[52 -5]
[52 -6]
CODE 53 - TIMED OUTPUT 1 VALUE
The Gemini has thecapability of varying the Timed Output 1 Valuefrom 0.01
second to 599.99 seconds. When the code is entered, instead of a single mode
identifierdigit being displayed, six digits will be shown. Refer to “Programming
the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for
more details about entering. The timed output will be terminated if the unit is
manually reset.
The Timed Output1 Value is used only when in Timed Output 1 Termination
mode, [52 5].
Note: A Timed Output Value of zero cannot be programmed into the Gemini. If a
value of 0 is entered into the display and the “E” key is pressed, the unit will
not enter the 0, but will stay in the data entry mode. If a new value is not
entered, it will time out and the unit will continue to use its previous setting.
CODE 54 - OUTPUT 2 TERMINATION MODES (GEMINI 4200
Only)
The Gemini 4200 has six “Output 2 Termination Modes” which control the
way Output 2 will terminate or reset. In all modes, Output 2 will terminate
immediately when the channel to which it is assigned is manually reset.
Output 2 termination modes 1 & 2 are available only when both outputs are
assigned to the Counter (B), [51 2].
A reverse phase mode is available on the Gemini 4200. This refers to the
complementing of the logic state of the output. With normal phase operation,
when the display value reaches Preset 2, Output 2 will turn on. The reset
conditionofOutput2 is output off.Inreversephase operation, Output 2turnsoff
when the Preset 2 Value is reached. The reset condition of Output 2 is output on.
(Note: The state of the relay, if used, is also reversed.) A “-” sign in front of the
mode identifier will provide for reverse phase operation. The absence of a “-”
sign will indicate normal phase operation.
[54 1] TERMINATE AT OUTPUT 1 START - Output 2 will terminate when
Output 1 starts. Output 2 is set for normal phase operation.
[54 2] TERMINATE AT OUTPUT 1 END - Output 2 will terminate when
Output 1 ends. Output 2 is set for normal phase operation.
[54 3] TERMINATE AT MANUAL RESET - Output 2 activates when the rate
or count, whichever it is assigned to, is greater than or equal to the Preset 2
Value. In this mode, onceOutput 2 is activated, it does not deactivate until the
moment a reset occurs. Output 2 is set for normal phase operation.
[54 4] TERMINATE AT MANUAL RESET END - This mode is like the
preceding, except Output 2 deactivates when reset ends. Output 2 is set for
normal phase operation.
[54 5] TERMINATE AFTER TIMED OUTPUT 2 - Once Output 2 has been
activated, it will deactivate after the predetermined length of time (code
55) hasexpired.ManualresetwilloverridethetimedoutputandresetOutput
2. When assigned to count or rate, Output 2 will activate when the display
valueisgreaterthan or equal to the Preset 2 Value. Output2issetfornormal
phase operation.
[54 6] BOUNDARY MODE - When in boundary mode, the Preset 2 Value
serves as the boundary point. When the display value (count or rate) is less
than the Preset 2 Value, Output 2 is not activated (normal phase). When the
display value is greater than or equal to the Preset 2 Value, Output 2 is
activated. If the display value were to drop below Preset 2, Output 2 would
then deactivate. For negative Preset points, Output 2 is notactivated when the
count value is more positive than the Preset 2 Value. When the count is more
negative than (only possible with counter) or equal to Preset 2, Output 2 is
activated. If the count becomes more positive than the Preset 2 Value, the
output again deactivates. When Output 2 is assigned to the counter and the
Preset 2 value is changed, Output 2 will immediately go to the proper state.
Uponpowerup,Output2,ifassignedtoCounterB,will“remember”itspower
downboundaryconditionandgotothatstate.Output2issetfor normal phase
operation. Programming Boundary mode will automatically select [56 1], if
[51 1 or 2] is programmed.
[54 -1]
[54 -2]
[54 -3] These modes are the same as above with the exception
[54 -4] that the output is set for reverse phase operation.
[54 -5]
[54 -6]
CODE 55 - TIMED OUTPUT 2 VALUE (GEMINI 4200 Only)
TheGemini4200 hasthe capabilityof varyingtheTimedOutput2Valuefrom
0.01 second to 599.99 seconds. When the code is entered, instead of a single
mode identifier digit being displayed, six digits will be shown. Refer to
“Programming the Presets, Scale Factors, Timed Outputs & Counter Load
Values” section for more details about entering. The timed output will be
terminated if the unit is manually reset.
The Timed Output2 Value is used only when in Timed Output 2 Termination
mode, [54 5].
Note: A Timed Output Value of zero cannot be programmed into the Gemini
4200. If a value of 0 is entered into the display and the “E” key is pressed, the
unit will not enter the 0, but will stay in the data entry mode. If a new value is
not entered it will time out and the unit will continue to use its previous setting.
CODE 56 - COUNTER (B) RESET MODES
The Gemini 4000 has six different counter reset modes. There are also two
methodsbywhichmanualresetcan actonthecounter (resetmustbeenabled, see
function code 66 and dip switch set-up). The first is a “maintained”reset action,
where the unit is held at reset for as long as the reset terminal or reset button is
activated.Thesecondisa“momentary”reset,inwhichtheunitresets,whenreset
isactivated, and startscountingeven though theterminalorresetbutton maystill
be active. A “-” sign in front of the mode identifier indicates “momentary” reset
action, the absence of the “-” sign indicates “maintained” reset action.
For the Gemini 4200, if both outputs are assigned to the Rate Channel [51 3],
ortheOutput2Terminationmodeisboundary[54 6],theonlyCounter(B)Reset
mode that is available is Reset to Zero [56 1].
In Reset to Zero modes the Output (if assigned to Counter B) activates at the
Preset Value. In Reset to Preset modes the Output activates at zero.
In the “Reset to Preset” modes, for proper operation, the counter normally
counts down. In the “Count with Inhibit” and “Separate Inputs” input response
modes, [43 1 or 4], the unit will automatically count down if a Reset to Preset
mode is selected. In the other input response modes, proper input phasing is
required for down counting. See “CODE 43 - INPUTS 1 & 2 RESPONSE
MODES” section for more details.
Note: The Reset Button & Terminal Actuation Mode must be programmed to
mode [42 2 or 3] in order to be able to manually reset the Counter (B). The
activation and de-activation response time for reset is 10 msec.
Note: For the Gemini 4200, all reset to preset modes reset to preset 2 and Timed
Output refers to Output 2.
[56 1] MANUAL RESET TO ZERO (RTZ) - Manual reset to zero is
accomplished by pulling the “RST.” terminal to “COMMON” or, if the front
panel reset is enabled, by pressing the front panel reset button. Reset is
“maintained”.
[56 2] MANUAL RESET TO PRESET (RTP) - Manual reset to Preset is
accomplished by pulling the “RST.” terminal to “COMMON” or, if the front
panel reset is enabled, by pressing the front panel reset button. Reset is
“maintained”.
[56 3] AUTOMATIC RESET TO ZERO AFTER TIMED OUTPUT - The
counter automaticallyresets to zero when Timed Output ends. Manual reset
is “maintained” and will override automatic reset. The “Output Termination
Mode” should be programmed for timed output operation, [54 5], when in
this mode.
[56 4] AUTOMATIC RESET TO PRESET AFTER TIMED OUTPUT - The
counter automaticallyresets to Preset when Timed Output ends. Manualreset
is “maintained” and will override automatic reset.
The “Output Termination Mode” should be programmed for timed output
operation, [54 5], when in this mode.
[56 5] AUTOMATIC RESET TO ZERO AT BEGINNING OF TIMED
OUTPUT (AT PRESET) - In this reset mode, the counter will automatically
reset to zero at the beginning of Timed Output (at Preset). The Timed Output
Value must be shorter than the time required for the counter to count to the
Preset Value, otherwise, the Output will appearto be latched on. Manual reset
is “maintained” and will override automatic reset. The “Output Termination
Mode” should be programmed for timed output operation, [54 5], when in
this mode.
[56 6] AUTOMATIC RESET TO PRESET AT BEGINNING OF TIMED
OUTPUT(ATZERO) -Inthisresetmode,thecounterwillautomaticallyreset
to Preset at the beginning of Timed Output (at zero). The Timed Output Value
must be shorter than the time required for the counter to count to zero,
otherwise, the Output will appear to be latched on. Manual reset is
“maintained” and will override automatic reset. The “Output Termination
Mode” should be programmed for timed output operation, [54 5], when in
this mode.
[56 -1]
[56 -2]
[56 -3] These modes are the same as above with the exception
[56 -4] that manual reset is set for “momentary” operation.
[56 -5]
[56 -6]
CODE 61 - RATE (A) RIGHT HAND DUMMY ZEROS
Dummy zeros can be used to alleviate display fluctuations due to an unstable
inputsignal.Thesezeroseffectivelymovesignificantdigitstotheleft.Therefore,a
normal count of 1 could be shown as a 10, 100, or 1000. Using the dummy zeros
will make it necessary to adjust the scaling if they were not considered before.
[61 1] 1 RIGHT HAND DUMMY ZERO
[61 2] 2 RIGHT HAND DUMMY ZEROS
[61 3] 3 RIGHT HAND DUMMY ZEROS
[61 4] NO RIGHT HAND DUMMY ZEROS
CODE 62 - RATE CONVERSION FACTOR
Therate conversionfactorprovides asimplemeansofobtainingthe desired rate
reading,usingthesameScale Factor Value as the counter,whentherateandcount
units are the same. In most applications, it is simply programmed to the desired
time unit that the rate is to displayed in. See Appendix “F” - Scaling For Rate.
[62 1] Rate Per Second (x1)
[62 2] Rate Per Minute (x60)
[62 3] Rate Per Hour (x3600)
CODE 63 - RATE MINIMUM UPDATE TIME
The determination of the rate value uses a method in which the elapsed time is
measured between the first and last pulse of the update period. The minimum
updatetimeisthe shortestthetimeperiodcan be.Oncethe minimumupdatetime
has expired, the unit will end the measurement period when the next negative
goingcount edgeoccurs.Iftheunit doesnotreceive thenext negativecountedge
within the maximum update time at the start of the measurement period, the unit
will end the time period and the rate display will go to zero. At very slow count
rates the update time period will be the actual period of one count cycle.
[63 1] 0.5 Sec. minimum/1 Sec. maximum
[63 2] 1 Sec. minimum/2 Secs. maximum
[63 3] 2 Sec. minimum/4 Secs. maximum
[63 4] 4 Sec. minimum/8 Secs. maximum
[63 5] 8 Sec. minimum/16 Secs. maximum (max. rate = 7500 cps)
[63 6] 16 Sec. minimum/32 Secs. maximum (max. rate = 3250 cps)
CODE 64 - RATE SCALE MULTIPLIER
The Rate Scale Multiplier is used in conjunction with the Rate Scale Factor A
and Rate Conversion Factor to scale the actual signal input to obtain the desired
reading. See Appendix “F” - Scaling For Rate.
[64 1] x 1000
[64 2] x 100
[64 3] x10
[64 4] x1
[64 5] x0.1
[64 6] x0.01
CODE 65 - RATE (A) DECIMAL POINT & LEADING ZERO
BLANKING
Therearesixbasicmodesof decimalpointplacementfor the Rate indicator of
the Gemini. The decimal point is placed to the right of the display digit that
corresponds to the mode identifier. (The right most decimal point, digit 1, is
never turned on.) A “-” sign in front of the mode identifier will inhibit leading
zero blanking. The absence of a “-” sign will enable leading zero blanking.
[65 1] 0
[65 2] 0.0
[65 3] 0.0 0 LEADING ZERO
[65 4] 0.0 0 0 BLANKING
[65 5] 0.0000
[65 6] 0.00000
[65 -1] 000000
[65 -2] 00000.0
[65 -3] 0 0 0 0.0 0 LEADING ZERO
[65 -4] 0 0 0.0 0 0 BLANKING INHIBITED
[65 -5] 00.0000
[65 -6] 0.00000
CODE 66 - “OPERATOR ACCESSIBLE FUNCTIONS” MODES
The Gemini has six basic levels of “Operator Accessible Functions”. Each of
these levels can be modified to enable or disable manual reset. When the “PGM.
DIS.” (Program Disable) terminal is connected to “COMMON”, access to all
functionsisdisabledexceptforthoselistedbelowwhichwillremainenabled.All
of the function codes and parameters can be interrogated, regardless of the
“Operator Accessible Functions” mode selected.
A “-” sign in front of the mode identifier will disable the front panel Reset
button and the “RST.” terminal.
Note: The front panel reset button can be independently disabled by using the
disable reset DIP switch.
[66 1] NO FUNCTIONS ENABLED EXCEPT RESET - In this mode, manual
reset is enabled, but none of the programming functions can be changed.
[66 2] PRESET PROGRAMMING AND RESET ENABLED - In this mode,
manual reset and the programming of the Preset Values are enabled.
[66 3] SCALE FACTOR PROGRAMMING AND RESET ENABLED - In this
mode,manualresetandtheprogrammingoftheScaleFactorValuesareenabled.
[66 4] SCALE FACTOR, PRESET PROGRAMMING AND RESET
ENABLED - In this mode, manual reset and the programming of the Scale
Factor and Preset Values are enabled.
[66 5] PRESET, COUNTER LOAD PROGRAMMING AND RESET
ENABLED - In this mode, manual reset and the programming of the Presets
and Counter Load Value are enabled.
[66 6] PRESET, SCALE FACTOR, COUNTER LOAD PROGRAMMING
ANDRESETENABLED-Inthismode,manualresetandtheprogrammingof
the Presets, Scale Factors and Counter Load Value are enabled.
[66 -1]
[66 -2]
[66 -3] These modes are the same as above with the
[66 -4] exception that manual reset is disabled.
[66 -5]
[66 -6]
PRESET VALUE
Whenever the display value equals the preset value (when output is assigned
to that display channel), an output action will occur. This action depends on the
previously programmed modes. The preset values may range from -999,999 to
999,999. (Refer to “Programming the Presets, Scale Factors, Timed Outputs &
Counter Load Values” section for instructions on entering the preset values.)
TheCounter(B)ScaleFactor,SFB,willhaveadirecteffectonthepresetvalue
being entered (if assigned to the counter). For a Scale Factor Value greater than
one, the preset value should be an integer multiple of the Scale Factor. If it is not,
the Gemini will automatically adjust the preset value up or down to force it to be
evenly divisible by the Scale Factor.
“1” - PRESET 1 VALUE
“2” - PRESET 2 VALUE (GEMINI 4200 Only)
SCALE FACTORS A & B
“3” SCALE FACTOR - The Scale Factor, for which value (count or rate) is
currently being displayed, is accessed by pressing the “3” key. To access the
Scale Factor of the “other” display value, the “+/-” key would be pushed (to
change the display to the other value), then the “3” key would be pushed.
Thenumberofpulsescounted (internal count value)ismultipliedbythe Scale
Factor, which changes the displayed value accordingly. A Scale Factor Value of
1.0000 would result in a display of the actual number of input pulses that have
been counted. The Scale Factor is used primarily for conversion from existing
pulses per unit of measure to the required displayed units. This includes
conversion from different units of measure (i.e feet to meters, etc.).
TheScaleFactorValuesmayrangefrom-5.9999to+5.9999(positiveonlyfor
Rate (A) Scale Factor, SFA). Refer to “Programming the Presets, Scale Factors,
Timed Outputs & Counter Load Values” section for entering instructions. It is
important to note that the precision of a counter application cannot be improved
by using a Scale Factor greater than one. To accomplish greater precision, more
pulseinformationmustbegeneratedper measuringunit. Forexample,if 5pulses
are being received per foot of material, the precision of 10th of feet cannot be
attained by simply programming a Scale Factor of 2.0000, even though the
displayisreading in10ths.Inthiscase,thedisplaywillincrementbytwoforeach
count input. Thus if an odd Preset Value was entered, such as 6.7 ft., the Gemini
will alter the preset to read in even tenths of feet.
Note: Use of a small Scale Factor in conjunction with a small scale multiplier
could cause the internal count value (counter) to be exceeded before the
6-digit display value is exceeded.
COUNTER LOAD VALUE
The Counter Load Value is provided to allow the user to modify the count
value. The Counter Load Value is reset to zero when the Gemini is powered up.
Once the Counter Load Value has been changed, it will remain set to that value
untiltheunit is powered down and up.AccessingtheCounterLoad Value for the
counter that is currently being displayed is accomplished by pushing the “E”
button, and while holding it down, also pushing the “+/-” button. See
“Programming the Presets, Scale Factors, Timed Outputs & Counter Load
Values” section for entering instructions.
“E” & “+/-” - Counter Load Value for the currently displayed counter.
DUAL PRESET COUNTER & RATE APPLICATION
A wire screen manufacturer requires a cut to length system,and in addition, a
prewarning of an overspeed condition. The cutting machineis equipped with an
existing 12 tooth gear, driving a one foot circumference feed roller.
The Gemini 4200’s counter is to read in feet. When 15,000 feet has been
accumulatedonthetakeuproll,thecounteroutput istoturnonanddeactivatethe
drive system. The operator will then make the cut, load a new take up roll and
reset the Gemini to start a new roll.
In addition to cut to length, the same Gemini 4200 is to be used to indicate the
speed of the wire screen in feet per minute, while providing a “overspeed”
warning. The normal running speed of the material is 225 feet per minute. The
maximum allowable speed of the process is 250 feet per minute.
HARDWARE SETUP
The accompanying drawing shows how the hardware is setup for this
application. A Model PSAC proximity sensor is used to sense the teeth on the
gear. The application does not require bi-directional counting, so the Gemini
4200 will be programmed for the Count with Inhibit “Inputs 1 & 2 Response
Mode”. In this mode, both the rate indicator and counter will utilize the same
input signal. The switch settings and the wiring connections are as shown. The
Input 2 switch positions 5-7 are set to put the Input2 in the non-inhibit state with
maximum noise immunity.
SCALING THE COUNTER
In order to scale the counter, the procedure and formulas in Appendix “E” -
Scaling for Counting are used.
In converting pulse units to “Display Units”, it is known that 12 pulses are
equivalent to 1 revolution of the feed roll, which is equivalent to 1 foot linear
travelofthewirescreen.The“DisplayUnit”,thereforeis1 footandthe“Number
of Pulses” per display unit is 12.
STEP 1 - Calculate the Total Scaling Factor, “KT”, using Formula #1 of
Appendix “E”. KT= Display Unit / Number of Pulses
KT= 1/12 = 0.083333
STEP 2 - Determine the Number of Count Edges, “NCE”, necessary for this
application, and calculate the Remaining Scaling required, “KR”, using
Formula #2 of Appendix “E”.
Since the Total Scaling Factor, “KT”, is less than 1, single edge counting can
be used, therefore, the Number of Count Edges, “NCE”, is 1.
KR=K
T/NCE
KR= 0.083333/1 = 0.083333
This manual suits for next models
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