SAB-E-SSI User Manual
Contents
1. 1V will return Rapid Controls RPM to SSI Converter Jan 10 2006 Jumpers Jumper X2 This jumper selects the serial communications format X2 1 2 RS485 X2 2 3 RS232 Jumper X3 This jumper connects the RS485 line termination resistors Install 1 4 and 2 3 for the last board in a series of RS485 configured boards to provide line termination X3 1 2 Connects RS485 to 5V pull up terminator X3 3 4 Connects RS485 to ground pull down terminator Jumper X4 SAB E A This jumper selects the Analog input to the A D converter XA 1 2 The output of the Instrumentation Amplifier is presented to the A D converter XA 2 3 The high level input from JP2 1 is presented to the A D converter Jumper X5 SAB E A Jumper X5 allows gain adjustments on the Instrumentation Amplifier X5 1 2 The gain is adjustable from 2 to 5000 using the Gain potentiometer X5 Removed The gain is fixed at 1 0 12 of 16 December 1 2010 Jumper X6 X7 and X8 SAB E A These jumpers select the A D converter full scale input voltage range 10V is the factory set range but use the 0 to 10V setting for uni polar input Jumpers X6 X7 and X8 must be set identically for correct operation The instrumentation amplifier gain can be used to accommodate other ranges Connections Connector JP1 Communications DB9 JP1 1 RS485 JP1 2 RS232 Receive from host JP1 3 RS232 Transmit to host JP1 4 DTR in Used only for in circuit programming JP1 5 DC Com2. back porch is the time period following the least significant bit and ending 25 microseconds after the last clock A controller can sample the data at this time to determine the condition of the sensor This operation is required by some Rockwell motion controllers SSI LED The second green LED the SSI LED shows the status of the SSI interface If the Status LED is lit the SSI interface is being interrogated A dark Status LED indicates that no activity has been detected on the SSI clock lines Status Relay A pair of relay contacts are provided to indicate sensor status to a host device These pins are open if the sensor 1s not good and closed if the green Sensor Status led is lit These contacts are across JP1 5 and 6 The sensor is always considered good for the SAB E A 6 of 16 December 1 2010 Setup The dip switches are used to configure the SAB E SSI or to enter Setup Mode The dip switches are sampled when power is applied so power must be cycled to make changes effective When dip switch 8 is ON the device will enter Setup Mode When dip switch 8 is OFF the device will enter Normal Operation Mode Switches 1 and 2 of dip switch S1 are used to select the SSI emulation as follows OFF 24 Bit Gray Code 25 Bit Gray Code Switches 3 4 and 5 SAB E R only of dip switch S1 are used to select the transducer measurement resolution which is the value of the Least Significant Bit in the SSI data train The values shown
3. taste ed eode ete t dete tee eder 12 Jumper X7 and X8 SAB EB A Jieha aei araar e enne o Eo rnnt eren nente nene TTE ENS nennen enne 13 nne 13 Connector JP1 Communications 9 13 Connector 1 2 Start Stop or PWM Sensor connector SAB E R sse 13 Connector JP2 Analog input connector 13 Connector SSI emulation connector sees eere 13 Connections for SAB E A SSI with isolated analog sensor ccceccesseeseeseeeceeseeeseeseceneeseeeseeeeeseeseenseeesaeees 14 Connections for SAB E R SSI with isolated sensor eren 15 Et CLOSURE D 16 3 of 16 December 1 2010 General Operation The SAB E module transmits a binary or Gray Code SSI data value in response to an SSI interrogation from a host controller Under normal operation or Sensor Conversion mode the value transmitted in response is determined by measuring the Start Stop PWM or Analog sensor and then scaling it using the gradient desired SSI resolution and a user configured scalar In Remote Control Slave mode the SSI value output is directly controlled by a host device over the RS232 485 serial link and sensor measurement data is not used At power on the board reads dip switch 7 to determine the operational mode Sensor Conversion SW 7 OFF or Remote Control Slave SW 7
4. Start Stop sensor is approximately 9 the sensor length in inches The required for a PWM sensor is 9 the sensor length in inches the number of recirculations If this time exceeds the time between SSI clock trains or the PWM signal is asynchronous internally interrogated then the setting should be set to IS synchronized The default value is IS synchronized F Factory Defaults Returns all setup values to the factory defaults E Save to EEPROM Saves the current values to the EEPROM Any setup changes will be lost once power is cycled until saved V View Sensor Position Use this item to see the converted value of the sensor The numeric value printed is the value loaded into the SSI transfer register A change of 1 count represents a change of 1 count in the emulated SSI value The printed value is scaled using the scale resolution and gradient settings from the dip switch and setup items Remote Control When dip switch 7 is ON the device is in Remote Control mode and is controlled by commands from the serial port A sensor is not necessary in this mode When the Remote Control dip switch is on the serial port is configured for the baud rate defined in setup mode and the module is silent the status messages are not printed at power on It responds only to valid commands to its node id The Baud Rate for Remote Control is determined in Setup Mode 11 of 16 December 1 2010 Remote Control protocol Remote Contr
5. kHz clock speed Dip Switch programmable output resolution 24 or 25 bit mode programmable settable via Dip Switch Gray code or binary SSI output is settable via Dip Switch Blinking Red LED indicates good operation of processor and SSI update rate Green LED indicates SSI activity Convenient screw terminal connections Specifications Model SAB E R e channel of Start Stop or PWM transducer measurement e PWM Sensor can be free running internally interrogated and asynchronous to the converter e Start Stop and PWM measurement resolution is selectable via dip switch as 5 10 20 or 50 microns or 00025 0005 001 or 002 inches e 5uS hold off period for Start Stop sensors e SSI update rate can be as fast as 4 kHz e Minimum time between SSI interrogation is 250 uS or conversion time plus 50 uS whichever is greater Model SAB E A One channel of DC voltage input with differential or single ended input Jumper selectable input ranges include 10 V 0 to 10 V 5 V and 0 to 5 V Expanded input range is 10 25 to 10 25 VDC or 0 to 10 25V Optional input gain of up to 5000 with Instrumentation Amplifier 16 bit A D converter 0 000153 V resolution in unipolar mode or 0 00031 V resolution in bipolar mode Minimum time between SSI clock trains 250 uS All Models One channel of 24 or 25 bit binary or Gray code SSI transducer emulation Maximum SSI clock frequency of 500 kHz Maximum SSI update rate of 4 kHz Power requirement
6. December 1 2010 Rapid Controls SAB E SSI r Rapid Controls Mod SAB E SSI A 2 A10914 11 30 10 User Manual The SAB E SSI outputs SSI position information based on either a PWM or Start Stop magnetostrictive transducer or an analog voltage signal depending on the model of SAB E SSI The SSI output is designed to be compatible with MTS and other magnetostrictive sensors with SSI protocol output Both models respond to the SSI clock signal with a scaled position directly related to the input data This position data can be offset or scaled by the user The SAB E SSI R uses a high precision time to digital conversion to achieve up to 5 micron resolution from Start Stop or PWM sensors without recirculation A remote control mode allows the SSI value to be controlled directly by a host device When in this mode the host can set the SSI output value using RS 232 or RS 485 serial commands 1 of 16 December 1 2010 Features Model SAB E R e Measures a Start Stop or PWM output magnetostrictive sensor with up to 5 micron resolution e Green LED indicates sensor function Model SAB E A e Measures one channel of uni polar or bipolar voltage input 10V or 0 to 10V e 16 bit analog to digital converter e Expanded input range 10 26V prevents saturation e Instrumentation amplifier and precision reference provided All Models Outputs one channel of 24 or 25 bit SSI output Fast output supports up to 500
7. I31UI 155 LEDs Input SSI System AC 866 510 7688 www rapidcontrols com Status Output Detail Jumper Detail X2 5485 Termination Inst Amp Gain gus Install 1 2 3 4 X5 1 2 Gain Enabled x3 Comm Select Not Set Gain 1 1 2 RS485 Analog Input Range 2 3 RS232 X6 1 2 10 to 10 VDC Analog Source X7 2 3 0 to 10 VDC 1 2 Inst Amplifier MET 2 3 JP1 1 Direct 8 X6 X7 and X8 must be set identically 14 of 16 December 1 2010 Connections for SAB E R SSI with isolated sensor SAB E R SSI EMUL M 1 LA 2 LA 3 DIR 4 X3 485 TERMINATION B ei 5 INSTALL 1 2 3 4 B 4 2 7 8 495 9 JP4 BOOT LOADER Se INSTALL TO PROGRAM x2 B OOM 8 3 1 2 R5485 ELECTRICALLY aV PVR 3 2 R8232 ISOLATED 5 ALE AIL A E NT ps 4 Lu 3 AXDCE COMMON WALA 2 WALA 1 15 of 16 December 1 2010 Enclosure The SAB E SSI is mounted in a DIN rail mounted enclosure containing one or two SAB E SSI boards The enclosure is 4 64 inches deep x 5 31 high x 1 77 wide and uses 1 8 inches of DIN rail space 16 of 16
8. ON In Sensor Conversion mode the module immediately sends version and setup information over the RS232 port at 9600 baud The module beings monitoring the SSI clock lines waiting for an SSI interrogation The sensor will be interrogated during this period If possible the sensor conversion process will be synchronized with the start of the SSI clock This data will be used for the next SSI output value In the Slave Mode the module responds to serial commands from the host The slave mode baud rate is determined in Setup Mode The SSI value is determined by the commands from the host If dip switch 8 15 ON the module will enter Setup Mode allowing baud rate and other items to be changed T4 I i on Daten SSI TIMING T1 Min of 1 usec T2 Min of 2 usec but is controlled by cable length T3 25 usec T4 Min of 250 usec Figure SSI Timing Diagram 4 of 16 December 1 2010 SAB E R Specific Operation SSI Value For the SAB E R module the value transmitted in response to the SSI clock is determined by the transducer measurement resolution and the entered scale value The PWM or Start Stop transducer is measured with the resolution requested by dip switches 3 4 and 5 and the entered sensor Gradient The value measured is multiplied by the scale value before it is output If for example the scale is 0 5 then the SSI output will be 4 of the measured value The default scale is 1 0
9. SSI Timing For the SAB E R module the interrogation of the sensor occurs on the leading edge of the SSI clock train The resultant value will be loaded on the trailing edge of the next SSI clock train If the measurement takes longer than the SSI update time the last completed measurement will be resent Measurements may overlap the SSI update times PWM gates may be asynchronous or internally interrogated VALUE FROM MOST RECENT N vae FROM MOST RECENT CONVERSION LOADED a 1 CONVERSION LOADED HERE PR EN SYNCHRONIZED LOAD ddp NON SYNCHRONIZED LOAD Interrogate I Start Stop s 8 Inches usec 50 USEC gs i 1 FREE RUNNING PVM E C zt D zu D o e co zx D I j amp E t n m lt z e oe a N o T o P o K SAB E R Start Stop TIMING 5 of 16 December 1 2010 SAB E A Specific Operation SAB E A SSI value For the SAB E A module the value transmitted in response to the SSI clock is determined by the input voltage and the scale value The analog input is measured with a resolution of 1 65536 yielding a digitized value in the range 0 to 65535 The value measured is then multiplied by the scale value before it is output If for example the scale is 0 5 the maximum SSI output will be 2 of 65535 or 32768 and the value of each SSI count will be doubled The scale value can be greater tha
10. are for a single recirculation If a PWM sensor is used the values shown will be divided by the number of recirculations set in the sensor I E with switches 3 4 and 5 off and a 2 recirculation sensor attached the actual resolution will be 2 5 microns OFF 20microns 1270 0 0005 inch 2000 0 001 inch 1000 0 002 inch In Sensor Measurement Mode the actual value transmitted over the SSI data lines in response to the SSI clock is determined by several dip switch and setup items If the correct gradient is entered and the scale is 1 0 a change of magnet position of 1 inch should produce a change in SSI output value of 1 resolution Switch 6 SAB E R only indicates the type of Transducer interface that is being measured Start Stop Switch 7 determines the source of SSI value When switch 7 is OFF the SSI value that is output is determined by the sensor and the associated scaling If switch 7 is ON the SSI value is controlled by serial commands from a remote host device See section Remote Control Remote Control SSI value is sensor value 7 F ON SSI value is controlled by serial commands from Remote Host Switch 8 is used to force the Emulator into Setup mode at power on Setup Mode Normal Operation In Setup Mode 7 of 16 December 1 2010 SAB E A Specific Setup Analog Input Source Selection The SAB E A module has a choice of two analog inputs high level single ended or dif
11. ferential instrumentation amplifier Jumper X4 selects which of these inputs is presented to the A D converter When Jumper X4 is installed 2 3 then the analog value at JP2 pin 1 is connected directly to the A D converter filter without amplification It is referenced to pin 2 analog common When Jumper X4 is installed 1 2 then the output of the instrumentation amplifier is connected to the A D converter filter input The instrumentation amplifier allows low level signals to be amplified and has a differential input for noisy environments When Jumper X5 is removed the gain of the instrumentation amplifier is 1 0 allowing a differential input for high level signals When jumper X5 is installed the GAIN pot can be adjusted for gains from 2 to 5000 When using a differential analog input connect the DC common of the source to JP2 2 analog common ZERO LOW PASS FILTER LOW PASS FILTER LOW PASS FILTER GAIN_ Differential Input X4 1 2 With Gain X5 Installed Analog Input Scaling The SAB E A module converts the analog input to a count value based on the A D converter range jumpers The range jumpers are set to 10V at the factory but can be changed to accommodate 0 to 10V The A D converter divides the input range into 63858 parts multiples this value by the scale and then presents these counts on the SSI interface as SSI counts The table below gives the values for the two common ranges supported INPUT RANGE X6 X7 X8 Maximum
12. m eie RR ERROR I E 6 Status Relay ce eM e e ERREUR E ar EU e ed 6 P 7 SAB E A SpecifiC Setup u Do EUR EORR YU E V IE DRE UH 8 Analog Input Source Selection sere eee eee E E ee HE PU er HAT tee gend 8 Analogs Input scaling ete om P ERE CRDI Hr er E aie 8 Analog Input Expanded Range ee e ei REL EE ee E Ren CREER E EUR s 9 Setup Mode hie eie tene e e a e n HERE 10 Cre Grad lente sioe E EARS Rt eger iere ERR eR eee ERO REOR te e DAR EE dt 10 HE Holdoftz m v tte torte bte enean icta os tere en Probe tM ae eoe a 10 tet gita e d eoe p e 11 A Sensor data IS or IS NOT synchronized to SSI 1 2 serene 11 F gt Factory Defaults cinco ee ea e EC e nO e edite Ur TEE Weston 11 E Save to BEPROM Eee ic Pip tested ege teas 11 V View Sensor Position tnc ines i See e tee Ro a Fi Aa ne EE o n PE vans 11 Remote Controle E IAAI AEN RSME ARE Ee 11 Remote Control protocol eere ete ERU PE n t E In 12 JUtnp ts inira ore PREPARED RE E SEIS RR OVE CU ERE ee 12 Jumper 2 ca tetra Oeo datu eene dt betta M CAP Mt 12 JU per m e HERMES I E e apes teas et ed vec miles 12 J niper X4 S AB EZA etel ene gelu EE SETS UT 12 Jumper X5 SAB E A
13. mon JP1 6 N C JP1 7 N C JP1 8 N C JP1 9 RS485 Communications cable pinout SAB E Signal SAB E JP1 PC DB9 Tx Data RS232 jl 3 Rx Data RS232 2 Connector JP2 Start Stop or PWM Sensor connector SAB E R JP2 1 Sensor common Isolated from the and JP4 connectors JP2 2 Interrogate to sensor JP2 3 Interrogate to sensor JP2 4 Gate from sensor JP2 5 Gate from sensor Connector JP2 Analog input connector SAB E A JP2 1 High level analog Input JP2 2 Analog common 2 3 Instrumentation Amplifier input 2 4 Instrumentation Amplifier input JP2 5 10V Reference Output Connector JP3 SSI emulation connector JP3 1 SSI data out 1 3 2 Ch0 SSI data out 3 ChOSSI clock in JP3 4 SSI clock in JP3 5 Status relay contact 2 closed contacts indicate good sensor 6 Status relay contact 1 JP3 7 7 5 to 27 Volts DC to power the board JP3 8 DC Common 13 of 16 December 1 2010 Connections for SAB E A SSI with isolated analog sensor RS232 Receive RS232 Transmit DTR DC Common Ground wwo Jens RS485 Rapid Controls 4 SAB E SSI A DC Common Ground DC Power 24VDC 10V Ref Out Inst Amp In Inst Amp In Analog Common Analog In Status 1 Status 2 SSI Clock SSI Clock SST DATA SSI Data PNW HUD CO 92e
14. n 1 0 but with a resultant loss in resolution For example a scale of 2 0 will yield a maximum SSI count of 131070 The default scale is 1 0 SAB E A SSI Timing For the SAB E A module the SSI clock trains must be separated by 250 usec K minimum of 250 usec 3 1 1 Interrogate A D Conversion 250 usec A D Conversion 250 usec SAB E A Analog conversionTiming Status The SAB E SSI has three LEDs for status indication one red and two green The red LED is the System LED The first green LED is the Input LED and second is the SSI LED System LED The red LED or System LED blinks during normal operation The blink rate indicates the update rate of the SSI clock After every 500 occurrences of an SSI interrogation the LED will change state from lit to dark or from dark to lit An SSI update frequency of 1kHz will result in the red LED blinking at a rate of 1 Hz In setup mode the red LED will be lit solid If no SSI clock is detected the red LED will flash very quickly Input LED The first green LED the Input LED indicates the status of the input sensor or voltage source A lit Input LED indicates that the input sensor is operating correctly A dark Input LED indicates a problem with the input sensor such as a missing magnet The Input LED status is also appended to the back porch of the SSI data stream with a low indicating good sensor status and a high indicating a fault The
15. ol commands consist of the ASCII Start of Message character followed by the ASCII Node ID 1 2 3 4 5 6 7 8 or 9 followed by the command and optional data followed by the message termination char Carriage Return ASCII The response to a good command message is the character followed by the carriage return ASCII Response to an incorrect command will be a followed by the carriage return ASCII Oxd The Mode command determines the SSI mode and data length A B character anywhere in the message will select binary operation G character anywhere in the message will select Gray Code operation The numeric values 24 or 25 must precede or follow the B or G characters 1MB24 will result in 24 bit binary operation for Node 1 3M25G will result in 25 bit Gray Code operation for Node ID 3 The Mode command P determines the value if the SSI data A numeric value followed by the carriage return is interpreted as a decimal value F character preceding the hexadecimal numeric value followed by the carriage return is interpreted as hexadecimal value 1P210000 will result in a data value output of 210 000 for Node ID 1 2PH210000 will result in a data value output of 210 000H 2 162 688 decimal for Node ID 2 The Version command V will return an ASCII string with the version of the software example
16. put Analog Input Expanded Range The voltage input to the module is actually scaled down by a factor of 0 974 before being presented to the A D converter This is done to allow for a small amount of inaccuracy in the placement of linear sensors in hydraulic cylinders The A D converter saturates when it s input reaches 10V or 10V preventing change in feedback beyond these values By scaling the input down the effective range is increased to 10 26V When you use the 0 to 10V range the range is limited to 0 to 10 26 volts The range is not increased below 0 but is increased above 10V A slight loss in measurement resolution is another result of the expanded range 9 of 16 December 1 2010 Setup Mode Setup Mode allows setting of the gradient variable the update time the remote control baud rate and viewing of the sensor data via a terminal or terminal emulator such as HyperTerminal Turn Dip Switch 8 ON and then power cycle the unit to enter Setup Mode The unit will respond with a Software version banner on the serial port at 9600 baud 8 bits No parity and 1 stop bit A menu will prompt for the setup values After changing the values you must save them to the EEPROM or they will be lost when the SAB E SSI is powered off Turn Switch 8 OFF and then power cycle the unit The new value will then be in effect The SAB E A Setup Menu Rapid Controls ANALOG to SSI Converter Nov 21 2006 SSI length 25 bit SSI format binary Senso
17. r is Analog Setup Mode for Rapid Controls Analog to SSI converter Select item to change Remote Control Comm Baud Rate 9600 Remote Control Node ID 1 Analog Filter length 1 Scale 1 0000000 View sensor position Save to EEPROM Factory Defaults Quit Menu zu lt 1 The SAB E R Setup Menu Rapid Controls RPM to SSI Converter Nov 21 2006 SSI length 25 bit SSI format binary SSI Resolution 0 005 mm Sensor is Start Stop Sensor Gradient is 9 0000000 Sensor Scale is 1 0000000 Setup Mode for Rapid Controls RPM to SSI converter Select item to change B Remote Control Comm Baud Rate 9600 N Remote Control Node ID 1 Gradient 9 0000000 H Holdoff 7 A Sensor data IS synchronized to SSI Clock S Scale 1 0000000 V View sensor position E Save to EEPROM F Factory Defaults Q Quit Menu G Gradient The gradient would typically be the value read from the sensor housing and is used to calibrate the module to the sensor The default value is 9 0 microseconds per inch This item is not visible on the SAB E A module H Holdoff The Holdoff time is the time when gate pulses are blocked from the sensor immediately after the interrogate signal is issued Occasionally sensors may have a sporadic or false gate which can be blocked by extending the holdoff time A high holdoff value can make a sensor appear no
18. s 7 5 26 VDC at lt 300 mA optional features may consume more current Enclosure is 4 64 inches deep x 5 31 high x 1 77 wide 118 x 135 x 46 mm Enclosure occupies 1 77 inches 45 mm of DIN rail space Ordering Information Model Input Output Channels SAB E SSI R Start Stop or PWM differential RS422 SSI differential RS422 1 SAB E SSI R 2 Start Stop or PWM differential RS422 SSI differential RS422 2 SAB E SSI A Analog Voltage 10V or 0 10V SSI differential RS422 1 SAB E SSI A 2 Analog Voltage 10V or 0 10V SSI differential RS422 2 2 of 16 December 1 2010 Contents Ordering Information x aoro n eti et t vr ee ine Opt ev Hud Pee 2 oui e O 3 General Operation rear e Re RR TE IRAE VAS E EG ERR R 4 SAB E R Specific Operation sese nennen enne nnne enne nnne nnns 5 DOT Value site coche tla hate nebat te etta tht ete Go ec See 2 SSI Timing see e e e ee RR IRE n e Per ER p e rere edi 5 SAB E A Specific Operation aee et hr et ede NI EO rends 6 SAB B ASSSLVAlUE tete rtt usted e 6 SAB E A SSI Timing itcr bas hay Ne d re b puede ne 6 STATUS sie ed cd o e nme Ue erdt t o ra e teed uv up c teet enit uud 6 System TED vint a deo on ati dete 6 p t LED PEDE 6 SSLEED anat aee RE de e hte m e
19. t to work when the magnet is close to the head 10 of 16 December 1 2010 The Holdoff function is not used when the PWM mode is selected Interrogate Holdoff Holdoff Effective Gat ipu HOLDOFF TIMING S Scale The scale is applied to the sensor position data before it is presented to the SSI output The scale allows the output value to be adjusted for units other than the values selected by the dip switch or to adjust for recirculations For example if you were using a PWM sensor with 4 recirculations you could apply a scale of 0 25 to adjust the output to recirculation The default value of the scale is 1 0 A Sensor data IS or IS NOT synchronized to SSI clock This setting an be used to optimize the availability of the converted data to the SSI clock The data resulting from the conversion of the start stop or PWM sensor can be loaded as soon as it s available not synchronized or wait for the end of the next SSI clock synchronized Loading it immediately will make it available for the next SSI clock train to read However in the event that the time required to convert the sensor data is longer than the time between SSI clock trains or if the sensor is an asynchronous PWM sensor the data load must be synchronized to the SSI clock to avoid loading the data while the SSI clock is active The time required to convert the data for a
20. usable MilliVolts SSI Count scale 1 0 OVto 10V 1 2 1 2 1 2 10 27 to 10 27V 0 31332216 0 to 10V 2 3 2 3 2 3 0 to 10 27V 0 15666108 8 of 16 December 1 2010 To calculate what the value of each SSI count is in the units of the input sensor divide the sensors full scale range in units by 63858 Remember that the full scale range is the number of units from 10V to 10V or 0 to 10V depending on the sensor and the A D converter input range Example 1 scale 1 0 Assume you have a 100 mm sensor that outputs 10V fully retracted and 10V fully extended You must use the 10V to 10V A D range and the Units per SSI count will be 100mm 63832 0 001565975mm SSI count Example 2 scale 1 0 Assume you have a 750 PSI pressure sensor that outputs at 0 PSI and 10V at 750 PSI You can use the OV to 10V range and the units per SSI count will be 750 PSI 63858 0 011745 PSI SSI count Example 3 same as example 2 but the scale is set to correct to an even number of PSI SSI count Assume that in example 2 you would like each SSI count to have a value of 1 100 PSI You can accomplish this by setting the scale To obtain the needed scale divide the PSI SSI count obtained in the example 2 calculations by the desired PSI SSI count 0 011745 0 01 1 17448 Enter this value as the scale The measurement resolution will not be increased but the values output on the SSI data lines are multiplied by the scale before being out
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