LCA15F High Speed Weighing Amplifier / Digitiser
Contents
1. soe 23 Instruction Set for ASCII Serial Communications 24 Modbtis Protocol c Pres eripe 25 LCATOR Printer 26 Chapter 8 Trouble Shootings Guide c0ccsccivnsivessdvascdes sencascudesands ssivaabaneswace 32 Chapter 9 LCA15F Specifications eee e 33 DC Analogue Outputs Eo Reese Fere es FoU P Ee Eu ede PUER FERA dees 33 Control 7 Alarm Relay Rt Que uud ea eo a presa tenis ER TA Y 33 The Comtu nications Port Dat a feces tev 34 Data Retention and Protection S E a S ERROR Eme 34 1 Mantracourt Electronics Limited LCA15F User Manual ENVirOnmenital II UIT 34 34 Ph sical sss E 34 Power SUPPLIES eh oer n Cn d a a tans e deese v NA des 34 LECA15F Order Code Sier OR PU EET Rede 35 Instrument Setup Record Sheet niri esie repre errore ua adve eoe 36 WARRANT dese ero v Duvet ce ue den de 36 Mantracourt Electronics Limited LCA15F User Manual 2 Chapter 1 Introduction to the LCA15F The In Line Intelligent Strain Gauge Amplifier LCA15F is a High speed version of the LCA15 and is a co2. LR1 LS1 LS3 LP1 LP2 Standard LCA15F with relay module and RS232 RS485 Communications and 110 240 volts AC power supply LCA15F Accessories The following accessories are available to allow for expansion of systems Function Order Code IF25 Interface Connect up to 25 LCA15Fs IF25 NOTE Details of the unit appears in a separate publication Printers Time date and display data TDP Display data only DP 35 Mantracourt Electronics Limited LCA15F User Manual Instrument Setup Record Sheet Product Product Code Serial No Tag No Date Location Measurement type range amp engineering units Communication Baud Rate LCA15F VALUE Inp t PASS SP1 IF1 SP2 IF2 HYS OA CALL CALH At dA OPL OPH dP CP SdSt or LAb Ln for printer rs WARRANTY All LCAF products from Mantracourt Electronics Ltd Mantracourt are warranted against defective material and workmanship for a period of 3 three years from the date of dispatch If the Mantracourt product you purchase appears to have a defect in material or workmanship or fails during normal use within the period please contact your Distributor who will assist you in resolving the problem If it is necessary to return the product to Mantracourt please include a note stating name company address phone number and a detailed description of the problem Also please indicate if it is a warranty repair
3. The sender is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit Mantracourt warranty does not apply to defects resulting from action of the buyer such as mishandling improper interfacing operation outside of design limits improper repair or unauthorised modification No other warranties are expressed or implied Mantracourt specifically disclaims any implied warranties of merchantability or fitness for a specific purpose The remedies outlined above are the buyer s only remedies Mantracourt will not be liable for direct indirect special incidental or consequential damages whether based on the contract tort or other legal theory Any corrective maintenance required after the warranty period should be performed by Mantracourt approved personnel only Gh ISO 9001 REGISTERED FIRM THE QUEEN S AWARDS l p e FOR ENTERPRISE In the interests of continued product development Mantracourt Electronics Limited reserves the right to alter product specifications without prior notice DESIGNED amp MANUFACTURED IN THE UK Code No 517 074 Issue 3 2 16 04 13 Mantracourt Electronics Limited LCA15F User Manual 36
4. LCA15F High Speed Weighing Amplifier Digitiser Module E User Manual www mantracourt co uk THE QUEEN S AWARDS FOR ENTERPRISE mantracourt Contents Page Chapter 1 Introduction to the 5 3 Chapter 2 Installing the LCAT5F 5 Environmental Req irerments riso e Ce gale Po eO er e M RE SO Pe tute 6 Conditions ioter cM 6 Terminal CONMECCIONS c 7 Chapter 3 The LCA15F Controls amp 8 The Configurable Parameters 8 Configurable Parameters ior sxe 9 Chapter 4 Strain Gauge Input to the LCA15F ccscsscscccsccsccscesscscescesscescenssssescescesssessessesceseeseeees 10 The Strain Gauge 10 Hardware COnfiguration2 10 Auto Calibration exc ote eoe ahs OO EIN De dds 11 Display Averaging GA PERI LP 11 Selection of Live Peak and Trough Valley eene nhe ehe ehe he ener 12 Chapter 5 Outputs 13 Output Scali
5. 19999 In Flight compensation for 5 2 Relay 2 operates at SP2 IF2 HYS 0 19999 Hysteresis amount applied to SP1 and SP2 OA 0 31 Output Action Relays energise or de energise above SP level Analogue output normal or inverted and latching CALL 19999 Calibration Low Display value for low calibration point Must be less than CALH CALH 19999 Calibration High Display value for high calibration point Note When CALH 0 the LCA15F display scaling is 19999 to 19999 At 19999 Auto Tare value dA 0 7 Display Averaging 1 to 64 standard display updates 8 15 Display Averaging 1 to 64 display updates for peak hold OPL 19999 Output Low minimum Display point for minimum analogue output OPH 19999 Output High maximum Display point for maximum analogue output dP Decimal Code dP Position Point 0 19999 To set the required position of the 1 1 9999 decimal point on the display 2 19 999 3 199 99 4 1999 9 5 19999 Cp 0 129 Comms Protocol 0 to 127 Printer 128 MANTRABUS 129 ASCII SdSt 0 254 Serial Device Station Number This is the address code for each LCA15F when the communications port is used or LAb Selects the desired label for the printer Ln Log Number rs 0 255 Sets Display Resolution 0 amp 1 Resolution of 1 least significant digit 2 255 Resolution setting of last digits InP Input Automatically returns the LCA15F to the input after scrolling Variable sequence is completed and updates permanent memory Note Invalid param
6. By writing 0200H via command 19 This writes the current contents of the variables store in the LCA15F into the EEPROM By writing 0400H via command 19 This updates the variables store from the current contents of the EEPROM Examples To disable the EEPROM on an LCA15F whose Station number is set to 47 OFFH 02FH 013H 01H 080H OBDH To re enable the EEPROM and update the RAM with the old EEPROM constants OFFH 02FH 013H 04H OOH 080H OB8H To re enable the EEPROM and update it with the new RAM data OFFH 02FH 013H 00H 02H 00H 080H OBEH For response see Response to Command 3 to 22 Command 20 Output Relay Reset DATA transmitted to LCA15F for Command 20 OFFH Station number 094H CHKSUM Where CHKSUM Station Number EXOR with 094H Example To output a relay reset to an LCA15F whose Station Number is set to 47 OFFH O2FH 094H OBBH Note MS BIT SET For response by LCA15F see Response to Commands 3 to 22 Command 21 Auto Tare DATA transmitted to LCA15F for Command 21 OFFH Station number 095H CHKSUM Where CHKSUM Station Number EXOR with 095H Example To output an Auto Tare command to an LCA15F whose Station Number is set to 47 OFFH O2FH 095H Note MS BIT SET For response by LCA15F see Response to Commands 3 to 22 Command 22 Peak Hold Reset DATA transmitted to LCA15F for Command 22 OFFH Station number 096H CHKSUM Where CHKSUM Station Number EXOR with 096H Exampl
7. VORKO BAUD SETTING 25 see diagram over page Figure 7 2 Connecting Multiple LCA15Fs 25 LCA15F s TO OTHER IF 255 IF25 CURRENT LOOP RS232 INTERFACE SUPPLY VOLTAGE 110 240 VAC ng HOST CONTROLLER Connecting Multiple LCA15Fs to the IF25 Interface Notes 1 Maximum loop voltage is 50V dc 2 Loop is isolated from host and LCA15Fs Loop should be earthed via Rx on IF25 254 3 IF25 used for up to 25LCA15Fs 4 At 19 200 Baud max cable length is 100m metres using cable type BICC H8085 LC3 Isolated RS232 484 29 Mantracourt Electronics Limited LCA15F User Manual Figure 7 3 The LC3 Isolated RS232 485 RS485 Mode Connections The SCR must not be used for RS232 connections For RS485 the SCR connection on the LC3 s can be daisy chained together and connected to a screen Ov if available from the masters RS485 comms port When multi dropping in RS485 mode The last device only should be fitted with LK2 which acts as a 120R terminating resistor Figure 7 4 Connecting Multiple Units on RS485 Fit LK2 in last device COM1 X Tx Rx R RS232 485 Converter NOT SUPPLIED Figure 7 5 RS232 Mode Connection to PC Note LK21 Must be made for RS232 operation 5 7 Rx 2 3 Tx 3 2 Mantracourt Electronics Limited LCA15F User Manual 30 Figure 7 6 RS232 Mode Connection to Printer Note 1 LK21 Must be made for RS232 operation
8. at the transducer end of the cables Use individually screened twisted multipair cable e g FE 118 2117 the pairs should be Tx amp Tx Rx amp Rx Terminate screens at SCR The screens should not be connected at the host port Use screened twisted pair cable e g RS 626 4761 Terminate screen at SCR The screen should not be connected at the host port SCR should be connected to a good Earth The Earth connection should have a cross sectional area sufficient enough to ensure a low impedance in order to attenuate RF interference 5 Mantracourt Electronics Limited LCA15F User Manual Cable Information For Reference only Country UK 118 2117 Individually shielded twisted multipair cable 7 0 25mm 2 pair Tinned copper drain Individually shielded in polyester tape Diameter 4 1mm Capacitance m core to core 115 pF amp core to shield 203 pF UK 585 646 Individually shielded twisted multipair cable 7 0 25mm 3 pair Tinned copper drain Individually shielded in polyester tape Diameter 8 1mm Capacitance m core to core 98 pF amp core to shield 180 pF UK 626 4761 Braided shielded twisted multipair cable 7 0 2mm 1 pair Miniature twin round Diameter 5 2 mm Capacitance m core to core 230 pF amp core to shield 215 pF Environmental Requirements LCA15F units can operate in any industrial environment provided the following limits are not exceeded at the point of installation Opera
9. by writing to a holding register the data sent is ignored See table LCA15F Printer Format CP must be set between 0 127 Printer selection enables the LCA15F to print its current display value to a printer via its communications port This display value can either be assigned a date and time stamp and or a log number depending on the user set options entered under mnemonic The log number can be reset or preset using the mnemonic Ln This value is not saved on power fail A label can be suffixed to the printed display value using the mnemonic A large range of labels are available to the user To initiate the printer function press the key followed within 1 second by the 9 key The printer function can also be initiated from remote contact by adding 32 to dP r The time and date are set in the TDP printer itself using its own menu The printer allows the entry of an additional custom text message Three connections are required between the LCA15F communications port and the printer with a maximum cable length of 100 metres See Chapter 8 for Details All standard LCA15F options are available with the exception of the communications modules which cannot be connected when the printer option is used NOTE The printer is not isolated from the Strain Gauge input When using RS232 module the printer is not isolated from the input Additional Mnemonics for the Printer Operation When the printer option is fitted fur
10. loop to RS232 interface which when included allows for an expansion of up to 250 LCA15Fs The RS232 port is available for Time Data or data only printers to be used logging all desired activities Baud speeds between 300 and 19200 are programmable The power supply module is available for 220 240V AC and 110 120V AC or 24 48V DC Further options provide the LCA15F in an IP65 die cast case for harsh environments or a PCB only Eurocard version is available for customers enclosures Two variants are available for rack mounting 3 Mantracourt Electronics Limited LCA15F User Manual Figure 1 1 Bagging Hopper suspended on 3 Grain Gauges only 2 shown Bagging Control Output Analogue Remote Output Indicator Figure 1 2 Drum Filling Control Output Ratform placed on 4 Grain Gauges Figure 1 3 Mixing Control RECIPE MIXING INGREDIENTS Strain Gauge 4 Weighing Point A Control Outputs Analogue Retransmission Recorder Mantracourt Electronics Limited LCA15F User Manual Chapter 2 Installing the LCA15F In order to maintain compliance with the EMC Directive 2004 108 EC the following installation recommendations should be followed Inputs Comm s Port Analogue Output Use individually screened twisted multipair cable e g FE 585 646 The pairs should be pins 1 amp 6 pins 2 amp 5 pins 3 amp 4 Terminate all screens at SCR The screens should not be connected
11. reasonably flexible If all five digits are entered no decimal point need be included If less than five digits are entered with no decimal point then the last digit is assumed to be the units Under normal circumstances the EEPROM in the LCA15F continually refreshes the working RAM However it can be disabled via the serial input by sending the instruction DROM 256 after the Station No In this condition all read write operations to or from the EEPROM are inhibited There are two instructions which will re enable the EEPROM 23 Mantracourt Electronics Limited LCA15F User Manual 1 ERRD this performs a read from the EEPROM and updates the working RAM with the contents of the EEPROM 2 ERWR this instruction writes the new RAM values into the EEPROM In both cases the EEPROM continues to refresh the RAM Instruction Set for ASCII Serial Communications Request for data DATA sent to LCA15F Data returned from LCA15F CR xxx DISP CR xxx SPACE DISP YYYYYY CR Station No label Station No label numerical value CR xxx DOSP CR SPACE DOSP SPACE CR Station No incorrect label Station No incorrect label DATA sent to LCA15F Data returned from LCA15F CR xxx SP1 100 0 CR Station No label numerical value CR xxx SP3 100 0 CR Station No incorrect label numerical value Table 7 1 Labels DISP DESCRIPTION SP1 REQUEST DISPLAY READING IF1 SET POINT 1 SP1 SP2 IN FLIGHT 1 IF1 IF2 SET POINT 2 SP2 HY
12. Mantracourt Electronics Limited LCA15F User Manual Chapter 3 The LCA15F Controls amp Parameters The Programmer Unit Is a small hand held unit together with a connection lead which plugs into a type socket on the main assembly board There is also an option for a permanent field programmer fitted internally All user controls displays and indicators are mounted on the front panel which provides a 4 5 digit LCD display and four flush mounted keys A flashing symbol in the top left hand corner of the display indicates programming mode Figure 3 1 Programmer Unit Panel Layout LP2 PROGRAMMER Table 3 1 Control Panel Guide 9 Used to scroll through and change the set up data by displaying mnemonics for each configurable parameter followed by the appropriate data When in programming mode it should be noted that the first digit in the display may not be visible but the program indicator will be flashing to indicate that the instrument is in programming mode even though no digits can be seen to be flashing Selects the display digit required Selection value is indicated a flashing digit and flashing program indicator A Increments each selected display digit 0 9 Pressing the 4 key under programming conditions will display the leading digit as either 1 1 ora blank display for zero R Resets the display to the input variable and enters new data in the LCA15F memory Returns the display to the curr
13. Note 2 If no RTS is available from the printer fit LK2 40E AP24 AAP40 NOTE When using an RS232 to RS485 converter which has a non biased receiver the following actions are recommended To bias the device 1 Terminate the receiver with 140R in place of the usual 120R 2 Fit a 1 5K from the receive negative to the receiver 5V supply a 3K3 to the 12V supply 3 Fit a 1 5K from the receive positive to the receiver supply Ground 31 Mantracourt Electronics Limited LCA15F User Manual Chapter 8 Trouble Shooting Guide This chapter is designed to assist in the identification of problems relating to the installation and setting up of the LCA15F 1 General Connection and setup parameters No display on power up a Check supply is present at the LCA15F terminals Display shows 1 or 1 continually without a weight applied to the Strain Gauge a Check input connections to the LCA15F from the Strain Gauge b If connecting a 4 wire device ensure terminals 1 amp 2 and 5 amp 6 are linked c Check Strain Gauge output between input terminals 3 amp 4 of the LCA15F d Check that the CALH weight is applied and is not the same or lower than CALL Display over ranges 1 or 1 when or before the maximum required weight is applied to the Strain Gauge a Check output of Strain Gauge is set to the correct sensitivity settings on the DIL switch Display very noisy a If using a 4 wire device ensure terminal
14. Protection of data and function s Watchdog timer giving repeat auto resets Impending power fail detection and shutdown Low power detection and hold off Environmental Storage temperature 20 to 70 C Operating temperature 10 to 50 C Relative humidity 95 max non condensing Front panel sealing To IP65 CE Approvals European EMC Directive 2004 108 EC BS EN 61326 1 2006 BS EN 61326 2 3 2006 Low Voltage Directive 2006 95 EC BS EN 61010 1 2001 Rated for Basic Insulation Normal Condition Pollution Degree 2 Permanently Connected Insulation Category lll Physical Case dimensions 200 x 120 x 75mm Case materials Light grey ABS Weight 725g Terminals 2 5mm saddle field terminals Accessibility All electronics accessible through front panel Power Supplies 210 260v 50 60Hz 10W 97 120v AC 50 60Hz 10W 9 32v DC 50 60Hz 10W Mantracourt Electronics Limited LCA15F User Manual 34 LCA15F Order Codes Input Standard Strain Gauge Outputs Standard Analogue Optional Modules Communications Port Output Control Alarm Relay Power Supplies Program Units Example LCA15F LR1 LC3 LS1 10v DC 160mA Output Range DC voltage Ov to 10v DC current 4 to 20mA Current Loop Multidrop RS232 RS485 Output Function 2 Relays SPCO on 5 1 amp 2 220 240v AC 50 60Hz 10W 110 120v AC 50 60Hz 10W 9 32V DC 50 60Hz 10W On Board Remote Hand Held LCA15F LC1 LC3
15. S IN FLIGHT 2 IF2 OA HYSTERESIS HYS At OUTPUT ACTION DA AUTO TARE At OPL DISPLAY AVERAGES dA OPH OUTPUT LOW OPL DP OUTPUT HIGH OPH SDST DECIMAL POINT dP r DROM CAN NOT BE WRITTEN TO SDST CP ERRD DISABLE EEPROM DROM 256 ERWR ENABLE EEPROM AND READ FROM IT RLYS ENABLE EEPROM AND WRITE TO IT OUTPUT RELAY STATUS 0 BOTH OFF 1 RELAY 1 ON 2 RELAY 2 ON 3 BOTH RELAYS ON RES OUTPUT RELAY RESET TARE AUTO TARE PKR PEAK HOLD RESET Mantracourt Electronics Limited LCA15F User Manual 24 Modbus Protocol This Modbus protocol has been implemented in accordance with Modicon Modbus Protocol Reference Guide P1 MBUS 300 Rev C With the following conditions applying The following conditions apply Baud Rate must be set for 9600 The format is Modbus RTU UART s shall be set for 8 bit word 1 start 1 stop amp no parity Data is considered to be half duplex using 2 or 4 wire medium To Select Modbus Protocol Set CP 130 Modbus states a new framing character is assumed after the time period to receive 3 5 characters 3 65mS has elapsed As a dedicated timer is not available for this function this time value has been increased to 25mS This means the master must not transmit a new message until 25mS after the previous message last byte has been sent The instrument only uses 3 commands Read holding register Preset single register amp Preset multiple registers Read holding register amp Preset mul
16. TARE At 14 E UPDATE DISPLAY AVERAGES AND HOLD FUNCTION dA 15 F UPDATE OUTPUT LOW OPL 16 10 UPDATE OUTPUT HIGH OPH 17 11 UPDATE DECIMAL POINT AND RESET FUNCTION DP r 18 12 CAN NOT BE WRITTEN TO AND LCA WILL RETURN A NAK SDSt CP EEPROM 19 13 ENABLE DISABLE 20 14 OUTPUT RELAY RESET 21 15 AUTO TARE 22 16 PEAK HOLD RESET COMMAND Request Peak Trough and Live Displays Data transmission to LCA15F for Command 0 Station Number 80H CHKSUM Where CHKSUM Station Number EXOR with 82H Example To obtain Live Peak Trough value of the LCA15F whose Station Number is 47 send the following data QFFH 2FH 80H OAFH Note MS Bit Set 19 Mantracourt Electronics Limited LCA15F User Manual Response Command Byte 1 Station Number 2 3 Live reading 4 5 Peak reading 6 7 Trough reading 8 EXOR CHKSUM of above data Command 1Request for all data DATA TRANSMITTED TO LCA15F FOR COMMAND 1 OFFH Station Number 081H Chksum Where Chksum Station number EXOR with 081H Example To obtain a complete dump of the variables in the LCA15F whose Station number is 47 send the following Data OFFH 02FH 081H OAEH Note MS Bit Set Response To 1 From LCA15F Byte 1 Station number 2 3 DISPLAY 4 5 SET POINT 1 6 7 IN FLIGHT 1 8 9 SET POINT 2 10 11 IN FLIGHT 2 12 13 HYSTERESIS 14 15 OUTPUT ACTION 16 17 A D COUNTS FOR LOW CALIBRATION POINT 18 19 A D COUNTS FOR HIGH CALIBRATION POINT 20 21 DISPLA
17. Y LOW CALIBRATION VALUE 22 23 ISPLAY HIGH CALIBRATION VALUE 24 25 AUTO TARE 26 27 DISPLAY AVERAGING 28 29 OUTPUT LOW 30 31 OUTPUT HIGH 32 33 DECIMAL POINT POSITION 34 35 STATION NUMBER 36 EEPROM ENABLE DISABLE FLAG 37 RELAY STATUS 38 EXOR CHECKSUM OF THE ABOVE DATA NOTE Most significant byte proceeds least significant byte for data sent by LCA15F Command 2 Request Display Data DATA transmitted to LCA15F for Command 2 OFFH Station number 082H Chksum Where Chksum Station number EXOR with 082H Example To obtain the display reading of an LCA15F whose station number is 47 send the following Data Mantracourt Electronics Limited LCA15F User Manual OFFH 02FH 082H Note MS Bit Set Response To Command 2 From LCA15F BYTE 1 Station No 2 Display reading M S Byte 3 Display reading L S Byte 4 EXOR checksum of above data and Station No If when using commands 1 or 2 an error is detected by the LCA15F then the Not Acknowledgement string is transmitted by the LCA15F Commands 3 To 18 Write Data To LCA15F Parameter Commands 3 to 18 all have the same format Format for data transmitted to LCA15F for Commands 3 to 18 OFFH Station No Command No MSN NMSN NLSN LSN CHKSUM Where MSN Most significant nibble of data NMSN Next most significant nibble of data NLSN Next least significant nibble of data LSN Least significant nibble of data with MSBIT set CHKSUM The followin
18. ay Inversion are set digitally using programmer keypad and display in engineering units Hysteresis value applies to both SP1 and SP2 Fail safe operation by setting inversion to give normally energised operation Latching Reset By volt free contact to field terminals or by communication 33 Mantracourt Electronics Limited LCA15F User Manual The Communications Port Data Operation All LCA15F display data can be retrieved via communications port along with relay and EEPROM status All LCA15F user configurable data can be changed including EEPROM enable display and relay reset LCA15F Station Number cannot be changed The LCA15F communications port provides for a 2 way data link An intelligent host e g Personal Computer Main Frame or PLC is able to acquire the LCA15F s displayed value and read or modify the user configurable parameters using any of the following a RS232 for a one to one communication as in the case of a printer PC or PLC b RS485 for the connection of up to 25 LCA15F units on a single RS485 line 20mA Current Loop for up to 250 LCA15F units on a single RS232 line via the IF25 interface With high noise immunity and isolation over distances up to 1Km Protocols available are ASCII and MANTRABUS selectable by the CP mnemonic on the display of the LCA15F programmer Data Retention and Protection Retention 10 years for set values minimum of 10 000 write cycles but typically 1 000 000
19. data up to 19 2K Baud is possible the actual rate being selected by an eight position slide switch on the communications module of which only 7 positions are used The Baud rate depends upon the communications hardware specification distance and cable type Position 1 300 Position 2 600 Position 3 1200 Position 4 2400 Position 5 4800 Position 6 9600 Position 7 19200 FAST MANTRABUS ONLY Fast MANTRABUS Format selected when CP is 128 To signify commencement of a new block of data the HEX number FFH is used as a frame character followed by the station number of the unit under interrogation This is entered via the LCA15F keypad under mnemonic SDSt and ranges from 0 254 The LCA15F acts upon incoming data only if its own station number immediately follows the FFH character New data must be received as a string of four nibbles bits 7 4 set to zero which are assembled into two bytes and written into the variables store within the LCA15F The most significant nibble must be received first and the last nibble must have the most significant bit bit 7 set to indicate the end of data This is followed by the checksum The data transmitted from the LCA15F is always sent as complete bytes The station number precedes the data and the checksum follows the data The data format used is signed 15 Bit The most significant Bit of the most significant Byte is set for negative numbers Operation There are two mod
20. e To output a Peak Hold reset to an LCA15F whose Mantracourt Electronics Limited LCA15F User Manual 22 Station Number is set to 47 OFFH 2 096H 9 Note MS BIT SET For response by LCA15F see Response to Commands 3 to 22 Example of a Basic Code to Communicate with Fast MANTRABUS open the serial port with no handshaking OPEN COM2 4800 N 8 1 RS DS BIN FOR RANDOM AS 1 request display from device 1 Frame FF Station No Command 2 Checksum of 1 And add 80 hex all bytes except frame to this byte as it is the last before as the checksum talk CHR amp HFF CHR amp H1 CHR amp H82 CHRS amp H1 XOR amp H82 print the string to the port PRINT 1 talk must add semicolon after string to stop transmitting a carriage return wait for a while this depends on how many bytes you are expecting and the baud rate input all the bytes in the serial buffer input from Ica15f INPUTS LOC 1 21 ASCII Format selected when CP is 129 The serial data to and from the LCA15F is formatted as eight bit words with no parity preceded by one start bit and followed by one stop bit The baud rate up to 9 6k Baud is selected on the COMMS module All communications are carried out using the standard ASCII character set Incoming line feeds and spaces are ignored upper and lower case letters are permitted The incoming data is continually monitored for Carriage Return characters Chr 13D If one is received the next thre
21. e characters 000 999 are compared with the LCA15F station number SDST previously entered via the keypad N B leading zeros must be included If no match is found the data that follows is ignored The next characters received up to 4 max are decoded as the label i e which variable in the LCA15Fis to be acted upon If the label is received incorrectly and cannot be decoded the LCA15F will return a followed by a C R character If the received label is followed by a C R the LCA15F will return the current value of the variable in question Because there is no hardware handshaking all transmission from the LCA15F is performed one character at a time upon receiving a Null character Chr 0 prompt from the Host system Thus for every character transmitted a prompt character is required The output from the LCA15F is an ASCII string of sixteen characters the last one being C R The first four characters are the Station No with leading zeros if necessary followed by a space The label then follows with spaces added if required to make a total of four characters The next seven characters is the numerical value of the required variable with polarity spaces d p and leading zeros added as required If the received label is followed by an character the LCA15F accepts the following numerical data which must be terminated by a C R and updates the variable in question and returns a C R character to the host when prompted Data input is
22. e direction of the input value as it changes For example In alarm applications A High High operation allows for a rising input value to operate on two set points to define an acceptable quantity weight or band of operation A Low Low operation operates on a falling value A High Low operation will operate on a rising or falling value setting a band by one set point operating normally and the other being an inverted action In Flight Compensation The setting of an In Flight value causes the set points to automatically adjust to control the flow of the material being weighed For example if SP1 is used to control flow a certain amount will be Flight between the supply point and receiving point causing a positive error when the required weight is reached The In Flight compensation value is adjusted by the user to reduce SP1 to prematurely stop the flow allowing the In Flight amount to make up the required total set by SP1 A similar situation exists for SP2 Mantracourt Electronics Limited LCA15F User Manual 16 Hysteresis HYS Once a Hysteresis value has been set it will be applied to both set points entered It is effective for both normal and inverted action When Hysteresis is applied to set points with normal output action the input is allowed to rise to the set point value and the output is then turned off The output is held off until the input value has dropped to the set point minus the Hysteres
23. e the range defined by OPL and OPH the analogue output will remain constant at its minimum or maximum output value Inversion of the analogue output can be set by the output action mnemonic OA See Relay Output Module Chapter 6 Example Assume a 4 20mA output module is required to provide an output of 4mA for 1000Kg and 20mA for 6500Kg Set OPL to 1000 and OPH to 6500 It will be necessary to determine OPL and OPH by graphical or mathematical means if the known display values do not coincide with the minimum and or maximum analogue output Figure 5 1 Analogue Output Max 19999 OP 6500 Output scaled over the complete display range ie OPHI 19999 OP LO 19999 py OP LO 1000 Output scaled over the complete display range ie Display 0 HI 6500 OP LO 1000 Min 19999 Analogue Output Min 4mA 20mA 13 Mantracourt Electronics Limited LCA15F User Manual Method of Calculating OPL amp OPH from any known output values DisplaySpan LowOutput MinOutput HighOutput LowOutput OPL LowDisplay OPH HighDisplay DisplaySpan MaxOutput HighOutput m HighOutput LowOutput Low output Known low output High output Known high output Min output Lowest measurable value of output module Max output Highest measurable value of output module Display span Highest required display value minus lowest required display value Example Using 4 20mA
24. ent value after Hold If during the programming sequence selection is not completed the display will revert to the input variable after 2 minutes The Configurable Parameters A series of parameters or programmable functions are provided in the LCA15F to allow the user good flexibility for monitor and control applications These parameters are included as constants in the LCA15F database and are accessed and checked via the programmer keypad or the communications port Data which is entered by the user is retained by EEPROM for up to 10 years without back up power New data when entered overwrites previous entries when the key is pressed unless the EEPROM has been disabled via the communications port Mantracourt Electronics Limited LCA15F User Manual Password Protection A 4 digit password number must be entered The number is accessed when PASS is displayed At this point it is necessary to enter either the factory set number 1111 in digit positions 2 5 or the password number specifically ordered by the customer Configurable Parameters Table 3 2 CODE VALUE FUNCTION Inp 19999 Live input reading P 19999 Peak reading t 19999 Trough valley reading PASS 19999 Security Password Correct value required to proceed further SP1 19999 Set Point 1 desired trip value of output 1 IF1 19999 In Flight compensation for SP1 Relay 1 operates at SP1 IF1 SP2 19999 Set Point 2 desired trip value of output 2 IF2
25. es of operation namely data requests by the host controller and data changes Data requests from the LCA15F consist of either a complete dump of the data variables stores in RAM or the display reading Mantracourt Electronics Limited LCA15F User Manual 18 Data changes consist of writing new data to LCA15F variables thus changing parameters such as Set Points in flights etc An acknowledgement message is returned to the LCA15F to indicate that the new data has been acted upon Updating The required mode or variable to be updated is determined by the station number followed by the command byte An EXOR checksum consisting of the station number command byte and any following data must be appended to the received data It is most important that the byte proceeding the checksum must have its most significant bit set to signify the end of data The LCA15F works out its own checksum and if it disagrees with the received one a not acknowledge NAK message is returned Communications Commands The following is a list of commands available for reading to or writing from the LCA15F COMMAND No DEC HEX DESCRIPTION 1 1 REQUEST ALL DATA INCLUDES WEIGHT INPUT 2 2 REQUEST DISPLAY DATA 3 3 UPDATE SET POINT 1 SP1 4 4 UPDATE IN FLIGHT 1 IF1 5 5 UPDATE SET POINT 2 SP2 6 6 UPDATE IN FLIGHT 2 IF2 7 7 UPDATE HYSTERESIS HYS 8 8 UPDATE OUTPUT ACTION OA 9 9 RESERVED 10 A RESERVED 11 B RESERVED 12 C RESERVED 13 D UPDATE AUTO
26. eter values Should an invalid figure be entered against any parameter it will be rejected and the display will return to show the parameter mnemonic 9 Mantracourt Electronics Limited LCA15F User Manual Chapter 4 Strain Gauge Input to the LCA15F The Strain Gauge Input The LCA15F offers a direct connection to most low level foil strain gauge sensors The following example is for calibration of a Strain Gauge A 10 volt excitation is provided and it is monitored to compensate for any variation due to supply drift load regulation or voltage drop in the cable between the sensor and the LCA15F The maximum supply current is 150mA which allows for the connection of 4 x 350 Ohm Strain Gauges Strain Gauge sensitivity is preset via DIL switches to 0 5 0 8 1 0 1 25 1 5 2 0 2 5 3 5 5 10 20 50 100 and 200 mV V Select the next value higher than the Strain Gauge output maximum SW1 mV V 1 25 10 0 20 0 50 0 100 0 200 0 OFF mV V mV V nominal full range gain within 3 Hardware Configuration The LCA15F is supplied set to 2 5mV V maximum To check if the Strain Gauge and application is within this range apply the following formula Maximum load weight x Strain Gauge output voltage Strain Gauge rated range For example 1 5 tonne x 2 5mV V 1 875mV V 2 tonne From the resultant figure is 2 5mV or less then calibration can be carried out If it is greater Select a
27. ey and check that the program light flashes h Apply the known higher value weight Check that the displayed value agrees with the high calibration weight applied to the Strain Gauge If this is not correct alter the display value by pressing the gt amp 4 keys Ensure that the Strain Gauge is free from disturbance and press the key The display will now indicate the Strain Gauge auto calibrated high value Note 1 The Calibration value is not entered into the memory until either the 9 key or the R key is pressed Note 2 CALH must always be greater than CALL in both weight and entered values Note 3 Pressing the R key at any time will return the display to normal operation Note 4 For best accuracy and resolution the calibration weight should be approximately 7596 of the Strain Gauge capacity Note 5 For range check before autocal set CAL H to O and display will be that of the A D counts It is important that the A D span between the CALL weight and CALH weight is greater than the span of the values entered for CALL and CALH otherwise the display resolution will not be 1digit Note 6 CALH can be set before CALL if required Note 7 CALH and CALL can be programmed individually with any time period between provided that the R reset key is pressed to store the value Auto Tare The auto tare facility allows for any unwanted weight or tare value to be compensated for in the weighing process Compensation is ach
28. g EXOR d with each other Station number command number MSN NMSN NLSN LSN with MSBIT set Example To change SP1 to 200 0 on an LCA15F whose station number is 47 The following data is sent Please note the following points apply 1 The decimal point is ignored i e 200 0 equals 2000 digits 2 The data is sent in Hex nibbles so 2000 07H OOH OFFH 02FH 00H 07H 80H OA6H Note MSBIT set Response to Command 3 to 22 If the data has been accepted by the LCA15F then the following acknowledgement string is transmitted by the LCA15F Station number 06H ACK If there are any errors with the data received by the LCA15F then the following Not Acknowledgement NAK string is transmitted by the LCA15F Station number 015H NAK Command 19 EEPROM Enable Disable The EEPROM disable facility can be used for any of the following l To limit the number of write cycles to EEPROM reducing degradation 1 Change data in the LCA15F RAM only allowing EEPROM to hold power up values Leave base constants in the EEPROM for later update to RAM which allows manipulation of the data before writing to the RAM Writing new data from the RAM to the EEPROM EEPROM disable is achieved by writing 0100H to the LCA15F via command 19 In this state all writing to or reading from the EEPROM is inhibited 21 Mantracourt Electronics Limited LCA15F User Manual The EEPROM can be re enabled in two ways
29. he case Figure 2 1 The LCA15F Field Connection Terminals FIELD TERMINAL CONNECTORS PROGRAMMER AT Auto Tare OV Common SC Screen E Excitation S Sense Input ind IN Input S Sense E Excitation 2 4 20 mA 4 ANALOGUE PT Printer LR Latch Relay Peak RELAY SENSITIVITY SELECTOR MODULE mVN ON mVN ON 05 23678 20 45 ADDITIONAL OUTPUTS o o o o o o o o o v WATCHDOG s LED N 10 Volt ta READ INSTRUCTION MANUAL BEFORE INSTALLATION NOTE THE LOADCELL amp CONTACT INPUTS ARE NOT INTENDED TO BE CONNECTED TO VOLTAGES TO EARTH ABOVE 50V ac OR 120V dc Please tkk the appropriate box PROGRAMMING PASS PASSWORD HYS HYSTERESIS dA DISPLAY AVERAGING Cp COMMS PROTOCOL GUIDE SP1 SET POINT OA OUTPUT ACTION PEAK HOLD LABEL FOR PRINTER F1 INFLIGHT 1 CALL CALIBRATION LOW OPL OUTPUT LOW Ln 106 NUMBER See Manual 5 2 SET POINT 2 CALH CALIBRATION HIGH OPH OUTPUT HIGH DISPLAY for full data 1 2 INFLIGHT 2 At AUTO TARE dP DECIMAL POINT RESOLUTION Figure 2 2 The 4 Wire Strain Gauge LCA15F TERMINAL BLOCK SCREEN INPUT OUTPUT OUTPUT INPUT Figure 2 3 The 6 Wire Strain Gauge LCA15F TERMINAL BLOCK SCREEN EXCITATION SENSE OUTPUT OUTPUT SENSE EXCITATION 7
30. higher setting with the DIL switch as necessary Before any calibration can be set it will be necessary to decide upon the calibration values and place the decimal point in the appropriate position To do this scroll through the parameters entering the password as appropriate as described in Chapter 3 until the decimal point parameter is reached dP r Once the decimal point is set the auto calibration parameters can be set in real engineering terms Mantracourt Electronics Limited LCA15F User Manual 10 Auto Calibration Connect the Strain Gauge switch on the LCA15F Connect the Programmer for RL1 version Allow a warm up period of 10 minutes before carrying out the procedure as follows a Press the key until PASS appears b Enter the password using and 4 keys then press 5 key C Keep pressing the 9 key until CALL Cal Low appears d Press the key and check that the program light flashes IMPORTANT NOTE Always ensure that the programmer indicator flashes even though the displayed value may not need to change e Check that the displayed value agrees with the low calibration weight applied to the Strain Gauge this may be zero If this is not correct alter the display value by pressing the amp amp a keys Ensure that the Strain Gauge is free from disturbance and press the 9 key to capture and calibrate the CALL value f CALH Cal High now appears on the display g Press the k
31. ieved by operating a closing contact connected between the AT terminal and zero volts on the field terminals It is possible to view the Auto Tare value by scrolling to the At mnemonic which will display the offset present in the Auto Tare mode If required Auto Tare can be keypad adjusted to any desired value to give a zero or fixed offset adjusted to any desired value to give a zero or fixed offset Display Averaging dA In certain applications due to the rapid changes in the display the least significant digits may not be readable In these cases the LCA15F readings may be averaged over a number of updates and can be set as follows 11 Mantracourt Electronics Limited LCA15F User Manual Table 4 1 Display update time 0 1 reading standard approx 0 04s 1 2 readings 0 08 2 4 readings approx 01 6s 3 8 readings approx 03 2s 4 16 readings approx 06 4s 5 32 readings approx 1 28s 6 64 readings approx 2 56s 7 Fast update mode approx 0 01s Selection of Live Peak and Trough Valley Readings Any one of these readings can be chosen as the default reading by the values placed in the dA Display Averaging mnemonics as follows Default live reading dA 0 7 Live Display averaging value Default reading dA 8 15 Live Display averaging value Default Trough Valley reading dA 16 23 Live Display averaging value The values of the three readi
32. is value For inverted action the input drops to the set point and the output goes off and comes on again when the input rises to the set point plus the Hysteresis value Output Action OA The Output Action facility allows the user to determine whether set points produce normal or inverted and latched or unlatched output operation The Output Action OA is entered by a code to suit the requirements of the user Thirty two Output Action options are available The value of the OA to be entered in the algebraic sum of the following components SP1 Inverted 1 SP2 Inverted AN OP Inverted SP1 Latched SP2 Latched 16 Fast Analogue Output 32 Example 1 If SP1 requires to be latched and inverted and the analogue output is normal enter8 1 9 Example 2 To invert the analogue output and latch SP2 enter 4 16 20 Latching Outputs The latching facility allows the relay module output to be held until reset externally Latching is applied to the off status of the relay SP1 or SP2 Figure 6 1 LR1 Module NO o C o ra RLI ISP 1 Ow Igp2 Relay 9 l oat Status C o RL2 pa LEDs NC o o To meet the Specified EMC Fast transient requirements it is important that the ferrite ring supplied is fitted as per the following instructions Illustration showing ferrite ring FEC 323 4940 fitted to the LR1 relay wiring Two turns of the wiring are passed th
33. mpact microprocessor based unit specifically designed to control weighing applications Its flexibility of design allows for the connection of most Strain Gauges pressure or strain gauges over a wide range of sensitivity Housed in a light grey ABS case it is sealed to IP65 standard to meet most environmental conditions The basic unit offers the following facilities simple auto calibration of the highest and lowest weights required easy auto tare setting and peak hold facility password facility gives protection to setup parameters DC analogue outputs of 4 20mA and 0 10V are standard with full scaling over any desired range and the ability to invert these outputs if required Gain sensitivity is selectable via DIL switches between 0 5 and 200mV V Several plug in options are available An optional relay output module provides for 2 set points and hysteresis can be applied to both set points together with In Flight compensation Relays can be inverted and latched All these facilities being set digitally in real engineering terms from the plug in programmer unit or from an optional internal display module Both relay and analogue outputs have a high level of isolation An Optional communications modules provide for 20mA noise immune current loop RS232 or RS485 connections to a PC PLC or main frame This allows for the input variable to be viewed and any setup parameters changed Multiple 20mA LCA15Fs can be connected via an IF25 current
34. ng eR erii pete esu E ep te EI iiim 13 Method of Calculating OPL amp OPH from any known output cece eee cece ence eene ene ehe enhn nnns 14 Calibration ORE Weve de ve epu 14 Fast Analogue The UAFAO reset ether rere 15 Chapter 6 Relay Output Module esee sees esee ens 16 General Descriptiori 2 6o a e rasa Un 16 M dule rre Ere Return SER RE eeu deste esee dede clap ese eres 16 Set Points SP crees eire Sere e eue epe s roe Me ie i ke Sent ec ERA vu s euge d sides Ue ae Dore sea Ve ra Dao UTER EROR 16 lm Elight Compensation 2 e cos Fre cade o yen 16 Hysteresis 5 dete 17 Qutput Action E 17 latching QUEDUTS seh 17 Chapter 7 The Communications eese sesso reso 18 Introduction iicet reete PE eee Rea So bea de wd RR EM E e ERO EAT bag CET RR SERE ee aede RI EP UE 18 Serial Communication Protocol he err sese scere etes 18 Fast MANTRABUS Format selec
35. ngs are viewed by pressing the scroll 9 key which will show the appropriate value for 2 minutes after which the display will revert back to the chosen default readings Where an Auto Tare value and Peak Trough are both operative it is important to be aware that an Auto Tare function although activated in the normal way will zero the input but not the display which will retain the Peak Trough value Mantracourt Electronics Limited LCA15F User Manual 12 Chapter 5 Analogue Outputs Two analogue outputs are available offering a DC current range and a DC voltage range They are fully scalable optically isolated and generated from the displayed input value The 4 to 20mA output is pre calibrated to an accuracy of within 0 15 of the range The 0 10V output is accurate to within 2 of the 4 to 20mA output OUTPUT RANGE DC voltage OV to 10V DC current 4 to 20mA Notes 1 Maximum current load on voltage modules is 2 2 Maximum drive voltage available in current modules is 20V 3 Response time from 33 step input to settle within 1 of final value 40mS 4 When a Fast Analogue Output Module is fitted set the OA mnemonic to 32 Output Scaling Output scaling factors are set by the user and determine the display range over which the analogue module operates OPL Output Low This sets the displayed value at the module s minimum output OPH Output High This sets the displayed value at maximum output If the display is outsid
36. output module where it is required to produce 6mA at a display value of 400 and 18mA at a display value of 1100 OPL 400 1007 6 4 18 6 1400 OPL 400 12 400 116 66 OPL 283 33 OPH 1100 erem Ge s 18 6 OPH 1100 12 1100 116 66 OPH 1216 66 Note 1 OPH must be greater than OPL Note 2 If OPL or OPH are greater than 19999 then divide both OPL and OPH by 10 this will give less resolution Decimal point can be placed anywhere to suit reading Calibration Re calibration can be made by adjusting the gain and offset potentiometers or by adjusting the values of OPL and OPH An offset can be achieved by increasing the values of both OPL and OPH and the gain by increasing the range between OPL and OPH Figure 5 2 Showing the Potentiometers for Gain amp Offset Adjustment GAIN ADJUST OFFSET ADJUST Mantracourt Electronics Limited LCA15F User Manual 14 Fast Analogue The UAFAO Module Important Note 1 The output action mnemonic OA must be set to 32 when operating with this module Important Note 2 When changing the value of OA to or from 32 it is necessary to power the unit off and back on again as a reset Figure 5 3 UAFAO Connections ICT 1 15 Mantracourt Electronics Limited LCA15F User Manual Chapter 6 Relay Output Module General Description The Relay output module provides output control signals which can be used fo
37. r switching functions such as ON OFF control and alarm indications The relays are activated by the values programmed for the Set Points The output configuration will be for open or closed relay contacts and latching Output Function 2 Relays SPCO on SP1 and SP2 The connections for which are shown in Chapter 2 Module Functions The LCA15F can be programmed so that the relay output module reacts to all or any of the following functions e Set points e In Flight compensation e Hysteresis e Relay inversion e Latching Set Points SP Set points are used to produce output signals at any required value so that the operation of the monitored process can be maintained to preset levels Any excursion beyond set points will activate the relay or relays to provide alarm or initiate control as required Two set points SP1 and SP2 can be programmed to suit different applications The actions of either or both set points can inverted if required For normal operation the set point output is active until the input reaches the set point level In this condition when the input value is less than the set point the SP indicator is on and the output relay is energised producing a closed circuit on a normally open contact When the set point value is reached the SP indicator is off and the relay is de energised producing an open circuit output For an inverted operation the reverse conditions apply Normal and inverted action is determined by th
38. rough the ring positioned 12cm from the LR1 end of the cable to improve immunity to electrical fast transients and bursts 17 Mantracourt Electronics Limited LCA15F User Manual Chapter 7 The Communications Port Introduction The LCA15F communications port provides for a 2 way data link An intelligent host e g Personal Computer Main Frame or PLC is able to acquire the LCA15F s displayed value and read or modify the user configurable parameters using any of the following a RS232 for a one to one communication as in the case of a printer PC or PLC b RS485 for the connection of up to 25 LCA15F units on a single RS485 line C 20mA Current Loop for up to 250 LCA15F units on a single RS232 line via the IF25 interface With high noise immunity and isolation over distances up to 1Km d Baud Rates 300 600 1200 4800 9600 e Isolation 130V RMS or DC max to analogue input or any other port 4 communication formats FAST MANTRABUS ASCII MODBUS RTU and PRINTER are selected from the mnemonic CP via the keypad of the programmer Integrity is ensured by pre programmed default parameters should a loss of communications with the host occur Serial Communication Protocol General Incoming data is continually monitored by the LCA15F on its serial input line Each byte of data is formatted as an eight bit word without parity preceded by one start bit and followed by one stop bit Transmission and reception of
39. s 1 amp 2 amp 5 amp 6 are linked b Check output voltage of Strain Gauge Display operating in wrong direction a Check connections to input terminals 3 amp 4 are correct way round b Check the type of Strain Gauge compression or tension Unit will not auto calibrate a Check that CALH is not zero and its weight is greater than CALL b Check that input is not overranged on CALH weight Access to parameters not possible beyond the PASSWORD PASS a Check for special password if not 1111 with your company or Mantracourt Quote serial number as a reference 2 Relay Output Module Incorrect Relay Operation a Check set point in flight and hysteresis values are correct b Check latching and invertion settings in output action OA are correct c Check connections to output terminals 3 MANTRABUS ASCII Format No Communications a Check that a comms module is fitted b Check correct CP code is entered for required protocol c Check connections to LCA15F from IF25 are correct d Check IF25 green LEDs are on and RX LED is on and TX LED is off Press TX TEST TX LED should light e Check RS232 connections from the host to the IF25 are correct f Check SdSt serial device station number is correct g Check Baud rate settings on LCA15F s are correct for the host h Check host comms port is set to 8 bit word 1 start bit 1 stop bit no parity i Check correct protocol is being observed by the host Mantracour
40. t Electronics Limited LCA15F User Manual 32 Chapter 9 LCA15F Specifications Strain Gauge Input Calibration Automatic digital by use of keypad and 1 or 2 known weights Auto Tare Auto Tare values can also be viewed and manually changed if required Auto tare value is retained on power down Auto Tare is affected from the field terminals Sensitivity Range 0 05 to 200mV V Factory set to nom 2 5mV V DIL Switch Selectable Preset to 2 Excitation 9V6 DC nominal 160mA maximum Compensation sense wires to compensate for cable connection volt drops and any variation in 10V supply Accuracy after 90 days 0 08 of reading 0 05 of FSD typical user Autocal Temp Drift 0 002 C typical e 2 5mV V Display Rate Programmer keypad selectable between 0 01 and 2 56 seconds Display Average Set by programmer keypad up to 64 standard updates Frequency Strain Gauge input to analogue output 3dB point 13 5hz Response DC Analogue Outputs Range Max Drive Typical Accuracy MIN MAX Capability of of FSD reading 4 20 20V 1K 0 1 0 1 0 10V 2mA 0 1 1 Isolation 130V RMS or DC to any other port 0 10V can be calibrated by offset and gain pots if required or alternatively PL and OPH Response time from step input to within 1 of final value 40mS Control Alarm Relay Output 2 SPCO relays 5 1 and SP2 Contact Rating 240V 5A AC Setpoint In Flight Compensation Hysteresis Latching and Rel
41. ted when CP is 128 ehe ehe hne ethernet enne 18 Operation s gach de oet eae er DER Ree ER PR EARN 18 entire 19 Communications Comlmnalids ciii onore Re cie ct EN t e dc de IE E PEN RA eI E Dr e ere eoe Ee RA UU UR vex eT ies tica Me 19 COMMAND Request Peak Trough and Live Displays 19 Response To Command 9 20 Command 1 Request forall data i eere Ree erdt ite dee es 20 Response To 1 From EGAT5F 20 Command 2 Request Display Data ists t steir ehe hh ehe hh e e ehe er ese ere eres 20 Resporise To Command Z From ECATbE rre esee Mists Dex ees 21 Commands 3 To 18 Write Data To LCA15F Parameter 21 Response to Command 30 22 e ete teuer Esa eoe RES 21 Command 19 EEPROM Enable Disable cesses rr LIII eI ve enero cane qa eo nd Lager e ye Ta Vico nos 21 Command 20 Output Relay E ikai 22 21 Auto 2 2 22 Gommand 22 Peak Hold Reset 22 ASCII Format selected when is 129
42. ther mnemonics are included in the normal range After the dP r mnemonic are the following Mantracourt Electronics Limited LCA15F User Manual 26 At this mnemonic the printer type and print format number is selected This number being appropriate to the type of printer used Details are advised with each type of printer selected Present types available are For the ITT IPP 144 40E printer the following numbers apply 0 Prints a sequential los number with the current display and unit of measure e g 00014 0011 3 tonne 1 Prints date and time with a sequential log number current display and unit of measure e g 00015 0001 7 tonne 2 13 07 99 12 05 06 Prints a sequential number current display unit of measure with customer text message No 1 e g MANTRACOURT ELECTRONICS LCA15F PRINTER 3 00012 000 2 tonne Prints date and time with a sequential log number current display unit of measure and a customer text message No 1 e g MANTRACOURT ELECTRONICS LCA15F PRINTER 00013 0023 6 tonne 13 07 99 12 03 04 4 7 Digitec 6700 series 8 9 Amplicon AP24 and AP40 Eltron LP2142 The label file must be called MEL and the label must contain a LOG NUMBER THE DISPLAY VARIABLE amp a LABEL not zero 12 ASCII string on print command 127 Continuous ASCII stream of the display data transmitted on every display update Note 1 9 gives an inverted print out Note 2 itis anticipated that further types of printer will be added and additional n
43. ting Temperature 10 C to 50 C Humidity 95 non condensing Storage Temperature 20 C to 70 C Two power supply options are available Units can operate from the following 220 240V AC 50 60Hz 10W LS1 110 240 110V AC 50 60Hz 10W 9 30V DC 10W LS3 Running current 250 480mA Dependent upon module configuration start up current 3Amps for 20mS Important Note To remove the power supply module using a pair of pointed nose pliers squeeze together the nylon barbs in the two pillars fitted at the top of J2 and C10 so they become ineffective Pull the board away from the pillar by the inter board connector Then from pillar by J2 Remove the two nylon pillars from the main board by twisting over in readiness for the power supply with NEW pillars Conditions Power in Watts I LCA15F and LP1 with 1 x 350R Strain Gauge connected and 4 20mA 12 24 analogue output providing 20mA into a short circuit 2 24 2 88 Il With relay module fitted add 0 58W 0 65W With RS232 module fitted no device connected add 0 07W 0 09W IV For each additional 350R Strain Gauge add 0 38W 0 48W Note Maximum number of Strain Gauges 6 x 350R or equivalent Mantracourt Electronics Limited LCA15F User Manual 6 Terminal Connections Connection between the LCA15F unit and input output signals including power supplies are made via 2 5mm field terminal blocks inside the unit Access to the terminals is made through glands in the bottom of t
44. tiple registers is limited to reading a single register Data is sent amp returned as signed 15 bit ie 1000 03E8 amp 1000 83E8 Broad cast commands are not supported Exception Responses The following exception codes will be supported only 01 Illegal function 02 Illegal data address 03 Illegal value Register Allocation Register Mnemonic No Disp y Da ADCALH CALL CAM s IE 101 Relay Reset 102 Disable EEROM 103 Enable RAM from EEROM 104 Enable EEROM from RAM 25 Mantracourt Electronics Limited LCA15F User Manual Example of reading a holding register Following example is for reading Display Net from station 1 Data sent 01 03 00 01 00 01 D5 CA See MODBUS manual for reference Data returned 01 03 02 MSB LSB CRC_HI CRC_LO Example of writing a holding register Command 06 Following example is for writing IF1 1200 digits to station 1 Data sent 01 06 00 03 04 BO 7A BE See MODBUS manual for reference Data returned 01 06 00 03 04 BO 7A BE Example of writing a holding register Command 16 Following example is for writing IF1 1200 digits to station 1 Data sent 01 10 00 03 00 01 02 04 BO CRCHi CRCLo See MODBUS manual for reference Data returned 01 10 00 03 00 01 BO CRCHi CRClo Note only 1 register can be written to using command 16 Action Commands These are registers above 99 They are executed
45. umbers will be allocated as appropriate LAb Label Number A number can be selected for the appropriate unit of measure See table below Note 0 NO LABEL 0 BLANK 1 Deg R 18 m 35 ton 52 RPM1000 2 19 36 Dev 53 3 Deg F 20 ft 37 W 54 kHz 4 Kelvin 21 degrees 38 kW 55 V DC 5 Ib in 2 22 L s 39 MW 56 mV DC 6 bar 23 L min 40 pH 57 ADC 7 mbar 24 L h 41 ppm 58 mA DC 8 kPa 25 gals s 42 uS 59 V AC 9 atm 26 gal min 43 Ohms 60 mV AC 10 mmHg 27 gal h 44 m s 61 AAC 11 inHg 28 RH 45 ft min 62 12 inH20 29 gram 46 RPM 63 spare 13 cmHg 30 kg 47 RPMx10 64 spare 14mm 31 lb 48 RPMx100 65 spare 15 Wh 32 kWh 49 cos 66 spare 16 Db 33 mile h 50 km h 67 knots 17 tonne 34 68 s 51 ms Ln Log Number 27 Mantracourt Electronics Limited LCA15F User Manual range of numbers 0 to 19 999 is available Any sequential number logging activity can be preset as desired between these numbers The number will reset to zero after 19 999 The log number is not saved on power fail and resets to zero on power up Provision is made in the LCA15F for communications via one of TWO module options LC1 The 20mA current loop module for connection to an IF25 interface LC3 An RS232 485 isolated module for connection to a PC or PLC in a single or multiple function Mantracourt Electronics Limited LCA15F User Manual 28 Connections for these options are shown Figure 7 1 LC1 Current Loop 2
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