7561 manual - Advanced Micro Controls Inc
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1. 7561 SSI Interface Module Ami 7500 RUN EH r4 Manual GG a g u Allen da do SLC 500 I O Module Manual 940 55010 Important User Information The products and application data described in this manual are useful in a wide variety of different applica tions Therefore the user and others responsible for applying these products described herein are responsible for determining the acceptability for each application While efforts have been made to provide accurate information within this manual AMCI assumes no responsibility for the application or the completeness of the information contained herein Throughout this manual the following two notices are used to highlight important points 5 WARNING WARNINGS tell you when people may be hurt or equipment may be damaged if the procedure is not followed properly CAUTION CAUTIONS tell you when equipment may be damaged if the procedure is not followed properly No patent liability is assumed by AMCI with respect to use of information circuits equipment or software described in this manual The information contained within this manual is subject to change without notice UNDER NO CIRCUMSTANCES WILL ADVANCED MICRO CONTROLS INC BE RESPONSIBLE OR LIABLE FOR ANY DAMAGES OR LOSSES INCLUDING INDIRECT OR CONSEQUENTIAL DAMAGES OR LOSSES ARISING FROM THE USE OF ANY INFORMATION CONTAINED W2. All warranty and support for this product and its application is provided solely by Advanced Micro Controls Inc Manuals at AMCI are constantly evolving entities Your questions and comments on this manual and the information it contains are both welcomed and necessary if this manual is to be improved Please direct all comments to Technical Documentation AMCI 20 Gear Drive Plymouth Indus trial Park Terryville CT 06786 or fax us at 860 584 1973 Revision Record The following is the revision history for this manual In addition to the information listed here revisions will fix any known typographical errors and clarification notes may be added This manual 940 55010 is the first release of the electronic version of this manual It is the equivalent of the printed version 940 05010 This manual corresponds to software revision 2 This software revision incorporates several new programmable features into the module that allow it to function as a general purpose SSI interface Also the format of the input and output data signifi cantly changed from the first software revision 20 Gear Drive Plymouth Ind Park Terryville CT 06786 1 Tel 860 585 1254 Fax 860 584 1973 ABOUT THIS MANUAL Navigating Through This Manual Bookmarks The table of contents in the printed version of this manual has been entirely replaced with Acrobat M bookmarks To access the bookmarks press the button here or in the toolbar The bookmarks w
3. TERRYVILLE CT 06786 T 860 585 1254 F 860 584 1973 LEADERS IN ADVANCED CONTROL PRODUCTS
4. 1 2 3 CLOCK m ge rU GOL DATA V Bt Gi Bic Bit 23XBit 24XBit 25 T i Bit 1 Y Bit 2 Y Bit a The first falling edge of the clock signal latches the SSI data Note Some transducers latch the data at the end of the previous interrogation amp The next 25 rising edges of the clock shift out the 25 data bits Tint is the time between interrogations Tip is the time between the end of the last interrogation and the start of the next Tmis the time that Bit 25 is valid which is typically 12 to 20 uS The transducer must have new data available within the Tip time period if the system is to work properly The table below gives the values of Tint and TM for the two different clock frequencies available with the 7561 ClockFra TINT TIDL 125 KHz 500uS 308uS 500 KHz 250uS 2024S Figure 1 2 SSI Protocol NOTE gt The formal SSI protocol definition includes a multi word transfer capability This is accomplished by holding the clock signal low for the TM time period and restarting the clock This signals the transducer to transfer additional bits of data instead of restarting at bit 1 The 7561 module does not support multi word transfers 4 ADVANCED MICRO CONTROLS INC INTRODUCTION Programmable Parameters The 7561 module is setup by programming its Programmable Parameters These parameters are broken down into two groups SSI Setup Parameters Five parameters that are used to extract the SSI
5. Cycle Program Format Word O X 0 01 Set this bit to program the SSI Clock Freguency MSB Number Number of Data Bits Data Logic and Data Type parameters The new values for all of these parameters are stored in O X 1 Program Scalars O X 0 02 Set this bit to program the Scalar Multiplier and Scalar Divisor parameters The new value of the Scalar Multiplier is stored in word O X 2 and the Scalar Divisor is stored in word O X 3 The range of both values is 1 to 32 767 and the Scalar Multiplier must be less than or equal to the Scalar Divisor Program Preset Value O X 0 03 Set this bit to program the Preset Value to the value specified by words O X 4 and O X 5 Note that programming the Preset Value has no effect on the Data Value To preset the Data Value you must set the PrstDV bit O X 0 00 ADVANCED MICRO CONTROLS INC BACKPLANE PROGRAMMING Output Image Table continued Command Bits continued RUT Program Rate Update Time O X 0 04 Set this bit to program the Rate Update Time to the value specified in word O X 6 The valid range of the Rate of Change Update Time is 1 to 1 000 mSec PgmDIR Program Count Direction O X 0 05 Set this bit to program the Count Direction parameter The parameter value is stored in the Count Direction bit O X 0 06 CntDir Count Direction Value O X 0 06 When the Program Count Direction bit O X 0 05 is set the 7561 programs the Count Direction based on this bit When set to zero the Count D
6. continued Preset Value The Preset Value parameter gives you the ability to offset the Data Value When you preset the Data Value the 7561 calculates an internal parameter called the Linear Offset The Linear Offset is the value needed to make the Data Value equal to the Preset Value The default Preset Value is zero Its range is 233 554 432 NOTE 1 Programming this parameter does not change the Data Value There is a separate command for presetting the Data Value to the Preset Value 2 The 7561 will issue a Preset Error message if you attempt to program a Preset Value that is outside of its range 3 Presetting the Data Value generates a linear offset If you are using a rotary encoder and wish to preset the position contact AMCI for assistance on developing the ladder logic needed to offset the Data Value in the SLC Count Direction This parameter is useful if your Data Value represents a linear position It gives you the ability to reverse the direction of motion needed to increase the position count For simplicity s sake the two values for this parameter are called Positive Direction and Negative Direction When this parameter is set to its default of Positive the Data Value is not changed When this parameter is set to Nega tive the Data Value is changed to 2 Data Value where n is the number programmed into the Number of Data Bits parameter If your Data Value represents a rotary position you can change t
7. data from the twenty five bit stream These parameters define the clock speed of the data transfer the position and length of the SSI data within the bit stream and the format of the data Data Setup Parameters Five parameters that affect the Data Value and Rate of Change information These parameters allow you to scale the Data Value preset it to a programmable count and set the update time of the Rate of Change information SSI Setup Parameters SSI Clock Frequency This parameter allows you to set the SSI clock frequency to one of two values 125 KHz or 500 KHz The default value of 125 KHz will work in all applications At this frequency the 7561 updates the data to the processor every 500 uSec At 500 KHz the 7561 updates this data every 250 uSec Therefore it may be advantageous to increase the SSI clock frequency if you have a high speed application Consult your transducer documentation to determine whether or not it will operate at 500 KHz Remember that the maximum SSI clock frequency is dependent on the length of the transducer cable Number of Data Bits amp MSB Number Parameters As the examples show in figure 1 3 these two parameters tell the 7561 where the SSI data is embedded in the twenty five bits The Number of Data Bits parameter specifies the length of the data and the MSB Number parameter specifies the bit that starts the SSI data The default value for the Number of Data Bits parameter is twenty four The defaul
8. one or more parameters is corrupted in the EPROM memory Acknowledge Bit 1 X 0 15 Set by the 7561 to acknowledge programming data from the processor Error Bits in word I X 0 are valid while this bit is set The 7561 resets this bit after the processor resets the Transmit Bit 20 Gear Drive Plymouth Ind Park Terryville CT 06786 15 Tel 860 585 1254 Fax 860 584 1973 BACKPLANE PROGRAMMING Output Image Table 16 Figure 4 2 shows the format of the Output Image Table data O X 0 contains Command and Transmit bits The other data words contain the values of the programmable parameters 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 x al Efe ITE le gt Ble wordo o o o o o o o 2 E 2 S Elz Ola a p lu a SSI Bit S Number of Word 1 z 0 0 corbaasmss S E 0 SSI Data bits o aja Word 2 0 Scalar Multiplier Word 3 0 Scalar Divisor Word 4 Upper 4 digits Preset Value PRESET SIGN e e e Word5 0 0 0 Lower 4 digits Preset Value Word6 0 0 0 0 0 o Velocity Update Time in mSec Figure 4 2 Output Image Table Data Format Command Bits PrstDV Format Scalars PrstVal Preset Data Value O X 0 00 Set this bit to preset the Data Value to the pro grammed Preset Value Note that you can program the Preset Value and preset the Data Value to the new Preset Value in a single Programming
9. result in damage to the module s circuitry and or undesired operation with possible injury to personnel You can install the 7561 module in any free slot except for the proces sor slot of an expanded local rack as long as power requirements are met 1 Align the modules circuit board with the top and bottom card guides in the rack 2 Gently slide the module into the rack until the top and bottom latches secure the module in place 3 To remove the module depress the top and bottom latches and slide the module out of the rack Front Panel Description Two LED s on the front panel shows the modules operating status RUN This green LED is on when the module is operational gt FAULT This red LED is on when there is a module fault NOTE The 7561 considers all twenty five SSI bits as data Therefore the 7561 cannot determine if there is a transducer penne AMG 7500 RUN G FAULT El Sa Transducer Input Connector Pin 1 at bottom Figure 3 1 7651 Front Panel error If your SSI transducer has error bits embedded in the SSI data your ladder logic should check these bits They are available in the raw SSI data the 7561 transmits to the processor If the transducer is not attached to the 7561 the SSI data will be all 1 s If you know that your SSI data can never be all 1 s use this as a check to see if the transducer is attached to the 7561 20 Gear Drive Plymouth Ind Park Terryv
10. the combined Data Value N7 21 from the number of encoder counts that you stored in N7 20 and store the resultin N7 22 This example assumes a 3 600 count encoder SUB SUBTRACT Source A N7 20 3600 Source B N7 21 3500 Dest N7 21 100 The zero count of the encoder is the same for either direction Therefore if the combined Data Value N7 21 is zero move a value of zero into the reversed count N7 22 Register N7 22 is now ready to be used as the position value by the rest of the program EQU EQUAL Source A N7 21 100 Source B 0 Source B Dest Figure 1 4 Reversing Count Direction in Ladder Logic Rate Update Time The Rate Update Time sets the amount of time between Rate of Change information updates to the processor Its range of values is 1 to 1 000 mSec with a default value of 100 mSec Decrease the time between updates for fast response to changes in this value Increase the time between updates for better averaging of this value 8 ADVANCED MICRO CONTROLS INC INSTALLATION Power Requirements The 7561 module draws its power from the I O rack s 5Vdc supply The maximum current draw is 0 215 amps Therefore the maximum current draw is 1 1 watt Add this to the power requirements of all the other modules in the rack when sizing the power supply Installing the Module Remove system power before removing or installing any module in an I O rack Failure to Observe this warning may
11. uses the Data Setup Parameters to convert the raw SSI data into the Data Value it reports to the processor The formula for determining the Data Value is Data Value SSI Data MUL DIV LO where MUL Scalar Multiplier DIV Scalar Divisor LO Linear Offset The Linear Offset is an intemal parameter that normally equals zero The Linear Offset is changed when you preset the Data Value Scalar Multiplier amp Scalar Divisor These two parameters are use to scale the SSI data Both parameters have a default value of one and can range in value from 1 to 32 767 The Scalar Multiplier must be less than or equal to the Scalar Divisor In other words the ratio of Multiplier to Divisor cannot be greater than one Linear displacement transducers from Balluff and MTS have resolutions measured in um count The 7561 can easily convert to a more familiar inch measurement system The table below shows the Multiplier and Divisor values needed to convert from various metric resolutions to inch resolu tions For example to convert data from a LDT with 5um count resolution to 0 0005 count resolution use a Multiplier of 50 and a Divisor of 127 Desired Resolution 0 0002 O 0 au 125 o Es __ Desired resolution exceeds resolution eel a me s amp 3 o a o ce a E Table 1 1 Scalar Values for Linear Measurement Conversion 6 ADVANCED MICRO CONTROLS INC INTRODUCTION Data Setup Parameters
12. 108 863 counts The Rate of Change has a range from 0 to 67 108 863 counts per second One type of SSI transducer the 7561 can interface with is the linear displacement transducer LDT LDTs are non contact absolute linear measurement devices that offer high resolution and accuracy The transducer tracks the absolute position of a magnet along its waveguide LDTs can be manufactured with a waveguide length from 2 to 300 inches There are two major manufacturers of SSI linear displace ment transducers Balluff and MTS Presently Balluff BTL 3 transducers offer a resolution and repeatability of up to 20 Figure 1 1 7561 Module um 0 0008 and an accuracy of up to 40 um 0 0016 MTS Temposonics III transducers offer a resolution and repeatability of up to 5 um 0 0002 and an accuracy of up to 50 um 0 002 The SSI protocol defines a twenty five bit serial data stream from the transducer that is synchro nized to clock pulses generated by the controller In this case the controller is the 7561 module The cable length from the transducer to the controller dictates the maximum allowable clock frequency In addition to the clock frequency the SSI protocol specifies that all data is transmitted using RS 485 signals However the protocol does not specify the content or format of the data bits The 7561 assumes the SSI data value is embedded somewhere in the twenty five bits and that other information such as error bits may also be include
13. 15 This bit stores the value of the SSI Clock Fre guency parameter When set to zero the SSI Clock Freguency parameter is set to its default of 125 KHz When this bit is set to one the SSI Clock Freguency parameter is set to 500 KHz 20 Gear Drive Plymouth Ind Park Terryville CT 06786 17 Tel 860 585 1254 Fax 860 584 1973 BACKPLANE PROGRAMMING Output Data Words continued Preset Value Format The Preset Value has a range of 33 554 432 Because the maximum number that will fit into one word is 32 767 the Preset Value is broken down into two words O X 4 and O X 5 The Preset Value is transmitted in sign magnitude format Bit O X 4 15 is the sign bit For example assume the Preset Value equals 12 345 678 First set the data table radix to decimal Enter the number 1234 in word O X 4 and the number 5678 in word O X 5 Next switch the radix to binary and set Preset Value sign bit O X 4 15 to P 18 ADVANCED MICRO CONTROLS INC BACKPLANE PROGRAMMING Programming Example Figure 3 3 is a three rung ladder logic example shows one way of programming the 7561 module It is certainly not the only way of programming the module The example uses the following addresses and assumes the module is located in slot 1 of the rack N 7 0 00 Manually set this bit to initiate data transfer to the 7561 module N 7 10 16 Holds the programming data to be written to the module O 1 0 6 Output Words of the 7561 O 1 0 15 Addre
14. ITHIN THIS MANUAL OR THE USE OF ANY PRODUCTS OR SERVICES REFERENCED HEREIN Standard Warranty ADVANCED MICRO CONTROLS INC warrants that all equipment manufactured by it will be free from defects under normal use in materials and workmanship for a period of 1 year Within this warranty period AMCI shall at its option repair or replace free of charge any equipment covered by this warranty which is returned shipping charges prepaid within one year from date of invoice and which upon examination proves to be defective in material or workmanship and not caused by accident misuse neglect alteration improper installation or improper testing The provisions of the STANDARD WARRANTY are the sole obligations of AMCI and excludes all other warranties expressed or implied In no event shall AMCI be liable for incidental or consequential damages or for delay in performance of this warranty Returns Policy All equipment being returned to AMCI for repair or replacement regardless of warranty status must have a Return Merchandise Authorization number issued by AMCI Call 860 585 1254 with the model and serial numbers along with a description of the problem A RMA number will be issued Equipment must be shipped to AMCI with transportation charges prepaid Title and risk of loss or damage remains with the customer until shipment is received by AMCI 24 Hour Technical Support Number 24 Hour technical support is available on thi
15. arameter has a range of two to twenty five The sum of the two parameters cannot exceed twenty six Scalar Error l X 0 01 Set when you attempt to program the Scalar Multiplier or Scalar Divisor parameters to a value outside of the range of 1 to 32 767 It is also set when the desired ratio of the two would be greater than one Preset Error l X 0 02 Set if the Preset Value is set to a value outside its range of 233 554 432 Rate Update Time Error l X 0 03 Set if you attempt to program the Rate Update Time parameter to a value outside of its range of 1 to 1 000 milliseconds Rate Overflow Error 1 X 0 05 Set if the Rate of Change information exceeds 64 108 863 counts per second Command Error l X 0 06 Set under three conditions 1 Your ladder logic attempts to program the module while the 7561 has a EPROM memory fault 2 No Command Bits O X 0 06 00 where set when the Program Cycle was initiated 3 One or more of the bits specified as zero in Word O X 0 or O X 1 are set to one The Command Error bit is reset when valid instructions are sent to the 7561 Message Ignored l X 0 07 If an error bit is set the error must be cleared by re programming the incorrect parameter This bit is set if you attempt to program a parameter with an incorrect value a second time Data Value Sign Bit 1 X 0 08 Set if the Data Value is negative E2PROM Error 1 X 0 12 Set when there is a EPROM memory error This bit is set if the value of
16. d 20 Gear Drive Plymouth Ind Park Terryville CT 06786 3 Tel 860 585 1254 Fax 860 584 1973 INTRODUCTION Overview continued The 7561 s Programmable Parameters are used to define where the SSI data is embedded in the bit stream and gives you the ability to scale this data For example assume that you are using a Balluff LDT that gives you one count per 20 um You can use the 7561 to scale this value to one count per 0 001 inch The calculated Rate of Change is scaled to the same units as the Data Value To continue the example the Rate of Change velocity is scaled to thousandths of an inch per second All parameter values are stored in non volatile EPROM memory Along with the scaled Data Value and Rate of Change information the 7561 reports the actual SSI data to the SLC processor This gives you the ability to use ladder logic to check the SSI data for any additional information it may contain such as error bits SSI Protocol Figure 1 2 shows how a 7561 module reads data from a SSI transducer Note that the formal SSI definition considers Bit 25 to be a stop bit which is always zero However AMCI is aware of some companies that are using Bit 25 as an information bit either as part of the data or as an error bit Therefore AMCI reads and includes this bit value in the SSI data reported to the SLC processor r TINT gt T o TM 1 2 3 23 24 di
17. he count direction with this parameter only if the number of counts in your Data Value is a power of two If it is not you can easily reverse the count direction with ladder logic 1 Subtract the Data Value from the number of encoder count and store it in a temporary register 2 If the Data Value equals zero then move zero into your temporary register 20 Gear Drive Plymouth Ind Park Terryville CT 06786 7 Tel 860 585 1254 Fax 860 584 1973 INTRODUCTION Data Setup Parameters continued Count Direction continued As an example the following ladder logic segment reverses the count direction of a 3 600 count encoder It uses the following registers l 1 1 2 Holds the Data Value from the 7561 Assumes the 7561 is in slot 1 N7 20 Holds the number of encoder counts which is 3 600 in this example N7 21 Holds the combined Data Value N7 22 Holds the reversed encoder count Because the Data Value can be greater than 32 767 it is transmitted to the processor in two words This rung combines the two words and stores the value in N7 21 Note that if your encoder has less than 10 000 counts this rung can be replaced by a rung that copies I 1 2 to N7 21 Also note that the maximum encoder counts supported with this logic is 32 768 MUL MULTIPLY Source A 11 1 0 Source B 10000 Dest N7 21 0 rADD ADD Source A N7 21 0 Source B I 1 2 3500 Dest N7 21 3500 Reverse the count direction by subtracting
18. ill appear in a window to the left of the document The bookmarks are multilevel just like the table of contents in the printed version Click on the arrows next to the bookmarks to expand or contract them When you see the section you want to go to click on the bookmark and the manual will jump to the correct page Thumbnails Thumbnails are small images of each page that you can use to navigate between pages They are not included in this file because they increase the files size by about 1090 and the bookmarks are much more useful 2 ADVANCED MICRO CONTROLS INC ki INTRODUCTION Overview Utilizing licensed Allen Bradley SLC500 I O interface technology the one slot 7561 SSI Interface Module accepts a single transducer input and plugs directly into the A B SLC rack The 7561 module reads and scales the data from any SSI transducer and also calculates the data s rate of change The meaning of the Data Value and Rate Of Change information depends on the type of transducer attached to the 7561 A SSI pressure sensor reports a pressure value and the 7561 calculates the pressure change per second A SSI position sensor reports a position value and the 7561 calculates the position change per second which is the velocity of the moving part Communicating through I O registers assigned to the slot the 7561 reports the Data Value Rate Of Change and actual SSI data to the SLC processor The Data Value has a range of 67
19. ille CT 06786 Tel 860 585 1254 Fax 860 584 1973 INSTALLATION Module ID Code All 7651 s have an ID Code of 3535 This reserves 8 Input and 8 Output words for the module When configuring the slot you can enter the SPIO CONFIG menu and reduce the number of scanned Input and Output words to seven each This will significantly decrease the access time for the module Compatible Transducers The 7561 Module is compatible with any transducer that outputs serial data using the SSI protocol The 7561 has been tested with both Balluff BTL 3 and MTS Temposonics III transducers Transducer Mounting Follow the mounting instructions you received with your SSI compatible transducer Transducer Power Supply An external isolated 24 Vdc supply is needed to power the SSI interface The 7561 draws a maximum of 0 030 amps to power its opto couplers Add this to the current requirements of the transducer when sizing the 24 Vdc supply Transducer Cable Installation Follow the transducer manufacturers suggestions when specifying the transducer cable Pre assembled and tested cables are usually offered by the transducer manufacturer When installing the transducer cable follow these general guidelines gt SSI signals are low voltage low power signals If you are using A B guidelines for cabling installation treat the transducer cable as a Category 2 cable It can be installed in conduit along with other low power cabling such as com
20. irection is set to its default value of Positive When this bit is set to one the Count Direction is set to Negative E CLR Clear E PROM Error O X 0 14 If there is a E2PROM error setting this bit will clear the error and reset all of the parameters to their default values TRMT Transmit Bit O X 0 15 A 0 1 transition on this bit initiates a Programming Cycle O X 1 Format Word Number of Data Bits O X 1 04 00 These five bits store the Number of Data Bits parameter It valid range is two to twenty five Note that the 7561 will generate a Format Error if the sum of the Number of Data Bits and MSB Number parameters exceeds twenty six DType Data Type Value O X 1 06 This bit stores the value of the Data Type parameter When set to zero the Data Type parameter is set to its default of Binary Data Type When this bit is set to one the Data Type parameter is set to Gray Code Data Type DLogic Data Logic Value O X 1 07 This bit stores the value of the Data Logic parameter When set to zero the Data Logic parameter is set to its default of Positive Logic When this bit is set to one the Data Logic parameter is set to Negative Logic MSB Number O X 1 12 08 These five bits store the value of the MSB Number parameter Its valid range is one to twenty four Note that the 7561 will generate a Format Error if the sum of the Number of Data Bits and MSB Number parameters exceeds twenty six SSICIk SSI Clock Frequency O X 1
21. munication cables and low power ac dc I O lines It cannot be installed in conduit with ac power lines or high power ac dc I O lines The shields of the transducer cable must be grounded at the 7561 module on y When installing the cable treat the shield as a conductor Do not connect the shield to ground at any junction box or the transducer This will eliminate ground loops that could damage the module or PLC Figure 3 2 is the pin out of the 7561 Transducer Input Connector The diagram also shows how to connect the external 24 Vdc supply to the module and color codes for transducer cables speci fied by Balluff and MTS 10 ADVANCED MICRO CONTROLS INC INSTALLATION Transducer Cable Installation continued Module Connector MTS AMCI Part MS 8 BALLUFF TEMPOSONICS Phoenix 4 MSTB2 5 8 ST 5 08 BTL3 ll SS TE DATA GRAY PINK 7e DATA GREEN GRAY a e PINK GREEN 5 pi Le YELLOW YELLOW 4 qp SHIELDS SHIELDS SHIELDS IS VVHITE BLUE 75 e SUPPLY COM BLUE WHITE ilo 24 Vdc I BROWN BROWN O O 424Vdc Vdc COM Chassis GND POWER SUPPLY Figure 3 2 7561 Connector Pin out 20 Gear Drive Plymouth Ind Park Terryville CT 06786 Tel 860 585 1254 Fax 860 584 1973 11 PA INSTALLATION Notes 12 ADVANCED MICRO CONTROLS INC BACKPLANE PROGRAMMING A 7561 module communicates with the SLC processor through the Input and Output Image Tables The Input Image Table is used transmit S
22. ow complete The 7561 checks the data is the order shown below 1 Clear E7PROM Error 5 Scalar Divisor Parameter 2 Number of Bits Parameter 6 Preset Value Parameter 3 MSB Number Parameter 7 Rate Update Time Parameter 4 Scalar Multiplier Parameter 8 Preset Data Value to Preset Value The SSI Clock Frequency Data Logic Data Type and Count Direction parameters are bit values that cannot be checked for errors Both states of the bit are valid If the module encounters an error it will set the appropriate error bit in Input Word 0 and stop processing the data All of your data must be correct before the 7561 accepts any changes 20 Gear Drive Plymouth Ind Park Terryville CT 06786 13 Tel 860 585 1254 Fax 860 584 1973 Input Image Table Figure 4 1 shows the format of the Input Image Table data I X 0 contains Error and Acknowl edge bits The other data words contain the Data Value Rate of Change and SSI data 14 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 BACKPLANE PROGRAMMING 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 x 5 5 50 5 T d oa a ololo To o o 2 2oOG2l0 E F fa el Sale a e B e 0 0 00 Upper 4 digits Data Value 0 0 0 Lower 4 digits Data Value 0 0 0 0 Upper 4 digits Rate of Change 00 0 Lower 4 digits Rate of Change r o 0 0101010 0 0 E Actual SSI Data a a a Act
23. s product For technical support call 860 583 7271 Your call will be answered by the factory during regular business hours Monday through Friday 8AM 5PM EST During non business hours an automated system will ask you to enter the telephone number you can be reached at The system will page one of two engineers on call Have your product model number and a description of the problem ready before you call ADVANCED MICRO CONTROLS INC ABOUT THIS MANUAL Introduction This manual explains the operation installation and programming of the 7561 SSI Interface Module for the Allen Bradley SLC 500 programmable controller systems Designed specifically for linear displacement transducers that use the SSI protocol the programmable features of the 7561 make it an efficient interface between any SSI transducer and the SLC 500 processor Itis strongly recommended that you read the following instructions If there are any unanswered questions after reading this manual call the factory An applications engineer will be available to assist you AMCI is a registered trademark of Advanced Micro Controls Inc The AMCI logo is a trademark of Advanced Micro Controls Inc SLC and SLC 500 are trademarks of Allen Bradley Company Temposonics is a registered trademark of MTS Systems Corporation This product incorporates technology which is licensed by Allen Bradley Company Inc Allen Bradley has not technically approved nor does it support this product
24. ss of the 7561 Transmit Bit 1 1 0 6 Input Words of the 7561 I 1 0 15 Address of the 7561 Acknowledge Bit Once the write to the 7561 has been enabled N7 0 0 copy the data to the module Note that the data does not have the transmit bit O 1 0 15 set Do this until the acknowledge bit I 1 0 15 is set Set to write to 7561 7561 Module ACK Bit N7 0 1 1 0 COP COPY FILE Source N7 10 0 la Dest 0 1 0 Length 7 Set the transmit bit O 1 0 15 as long as the write to the 7561 is enabled and the module has not responded by setting the acknowledge bit Set to write to 7561 7561 7561 Module ACK Bit TRMT Bit N7 0 I 1 0 O 1 0 HM C 0 15 15 Once the acknowledge bit is set unlatch the Write to 7561 bit N7 0 0 Set to write to 7561 Set to write to 7561 Module ACK Bit 7561 Module N7 0 I 1 0 N7 0 U 0 15 0 Figure 3 3 Sample Ladder Logic Program CAUTION The EPROM is guaranteed for approximately 100 000 Programming Cycles before writing to it will cause a non clearable EZPROM fault Therefore continuously presetting the Data Value or writing new parameters should be avoided If you application requires you to continuously preset the Data Value consider calculating and applying the required offset in the SLC program 20 Gear Drive Plymouth Ind Park Terryville CT 06786 19 Tel 860 585 1254 Fax 860 584 1973 ADVANCED MICRO CONTROLS INC PLYMOUTH INDUSTRIAL PARK
25. t value of the MSB Number parameter is one SSI DATA BITS 12345 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Number of Data Bits 16 MSB Number 9 16 Bit Data Value Number of Data Bits 20 20 Bit Data Value MSB Number 1 Figure 1 3 Embedded Data Value Refer to the documentation that came with your transducer to determine where the SSI data is located in the twenty five bit field If you are using a Balluff LDT the default values should work correctly If you are using a MTS LDT Set the Number of Data Bits equal to the LDT s number of bits and the MSB Number to one 20 Gear Drive Plymouth Ind Park Terryville CT 06786 5 Tel 860 585 1254 Fax 860 584 1973 INTRODUCTION SS Setup Parameters continued Data Type This parameter tells the 7561 to interpret the SSI data as a binary number or a gray code number The default value is Binary Data Logic This parameter is included to handle situations where the SSI data is reported with negative logic If this parameter is set the 7561 will assume the SSI data is reported with negative logic and will invert the data bits before performing any scaling The default value is positive logic When this parameter is left at its default value the 7561 will not invert the SSI data Data Setup Parameters Once the 7561 has extracted the SSI data from the twenty five bits it
26. tatus Data Value Rate of Change and SSI data to the processor The Output Image Table is used to setup the 7561 as well as adjust the Data Value from the processor This chapter details the format of the data in the Input and Output Image Tables and how to program the 7561 Data Addressing Data addresses are defined in the following manner LX n Input Image Table O X n Output Image Table Where X is the slot number of the 7561 and n in the word number in the data block When referring to a specific bit in a word the characters bb will be appended to the file address where bb is the bit address Programming Cycle Programming changes are written to the module with a Programming Cycle All programmable parameters can be changed and the Data Value can be preset with a single Programming Cycle Programming Cycles are controlled with the Transmit and Acknowledge Bits A Programming Cycle consists of six steps 1 Write the new data in the correct Output Image Table words 2 Set the Transmit Bit The 7561 will not act on the new programming data until the Transmit bit is set 3 Once the 7561 is done with the programming data it will set the Acknowledge Bit and any necessary error bits 4 Once your ladder logic sees the Acknowledge Bit set check for any errors 5 Reset the Transmit Bit after you ve responded to any errors 6 The 7561 responds by resetting the Acknowledge Bit The Programming Cycle is n
27. ual SSI Data m m Figure 4 1 Input Image Table Data Format Data Value and Rate of Change Format The Data Value has a range of 64 108 863 and the Rate of Change has a range of 0 to 64 108 863 Because the maximum number that will fit into one word is 232 767 these two values are broken down into two words each The Data Value sign bit is located at I X 0 08 and is set to 1 if the Data Value is negative For example assume the Data Value equals 12 345 678 The number 1234 is transmitted in Input Word 1 the number 5678 is transmitted in the Input Word 2 and the sign bit I X 0 OS is set to 1 The Rate of Change information is the magnitude of the change only It is a positive value regardless of the direction of change If your SLC processor supports floating point numbers you can convert the Data Value or Rate of Change information with the following steps 1 Floating Point Number Upper Word 10 000 Lower Word 2 For Data Value conversion only If the sign bit 1 then Floating Point Number 1 Floating Point Number ADVANCED MICRO CONTROLS INC BACKPLANE PROGRAMMING Input Image Table continued Status Bits FMTErr SCLErr PSTErr RUTErr ROvErr CMDErt Msglgn DVSgn E Err ACK Format Error 1 X 0 00 Set when there is an error with either the MSB Number or Number of Data Bits parameters The MSB Number has a range of one to twenty four The Number of Data Bits p
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