User Manual
Contents
1. Z SG Strain Gauge Converter General Description Module Z SG is a strain gauge signal converter Measurements taken using the 6 wires or 4 wires technique are available through Modbus RTU serial protocol or the analog output The module is also characterised by e Facilitated power supply and serial bus wiring by means of the bus housed in the DIN rail Communication configurability by DIP switch or software RS485 serial communication with MODBUS RTU protocol maximum 32 nodes Protection against ESD discharge up to 4 kV Input insulation 1500 Vac compared to all the other circuits Insulation between communication and power supply 1500 Vac Insulation between analog output and power supply 1500 Vac Analog output in voltage or current with settable limits Strain gauge calibration with standard weight Strain gauge calibration not required if the sensitivity of the strain gauge is known Configurable digital I O Rejection at 50 and 60Hz Configurable Resolution Sampling frequency settable from 12 53 Hz to 151 71 Hz Stable weight indication via Modbus register digital output Remote writing of the tare in volatile and or non volatile memory by digital input Modbus register Modbus commands Strain gauge directly powered by instrument Ratiometric measurement Sensitivity from 1 to 64 mV V settable by DIP switch for integer values via software for real integer values e Alarm generated when programmable threshold is e2. indicates that this product should not be treated as household waste when you wish to dispose of it Instead it should be handed over to an applicable collection point for the recycling of electrical and electronic equipment By ensuring this product is disposed of correctly you will help prevent potential negative consequences to the environment and human health which could otherwise be caused by inappropriate disposal of this product The recycling of materials will help to conserve natural resources For more detailed information about the recycling of this product please contact your local city office waste disposal service or th retail store where you purchased this product This documentis property of SENECA srl Duplication and reprodution are forbidden if not authorized Contents lof the present documentation refers to products and technologies described in it All technical data contained in the document may be modified without prior notice Content of this documentation is subject to periodical revision ____ SENECAs rI KaNet Via Germania 34 35127 Z I CAMIN PADOVA ITALY 1S09001 2000 Tel 39 049 8705355 8705359 Fax 39 049 8706287 e mail info seneca it_ www seneca it M1001204 E ENGLISH 16 16
3. and non volatile memory 50700 0xC60C Save the known weight in non volatile memory SENECA M1001204 E ENGLISH 14 16 Remote Memorizing of the Tare The memorizing of the tare may be perfomed in the following ways Action Memorizing Memorizing Notes in Volatile in Non Memory Volatile Memory 4 5 Digital ith ON J e igital Input wi EE 45 Only for Modes 2 or 4 Once the Digital Input with ON E D e tare has been saved restart the a module in these modes q 5 Digital Input with ON m E E Bit in reg STATUS 45 or with ON UJ Command 49594 a i Bit in reg STATUS 45 or with O Command 49594 7 B 4 5 Command 49914 with ON m m e p 4 5 Command 49914 with ON m E e APPENDIXA Configuration of Sampling Frequency Rejection The table below provides the values that can be set in the Modbus register CONFIG FREQ_REJ 40060 together with the corresponding sampling frequency values It is also indicating whether rejections are enabled at 50 or 60 Hz Value of Register Sampling Rejection Rejection CONFIG FREQ_REJ Freq Hz 50 Hz 60 Hz 40060 151 71 74 46 49 95 SENECA M1001204 E ENGLISH 15 16 Disposal of Electrical amp Electronic Equipment Applicable throughout the European Union and other European countries with separate collection programs This symbol found on your product or on its packaging
4. functions are described below SENECA M1001204 E ENGLISH 3 16 Stable Weight Function The Stable Weight function informs the user of the precise moment in which weight has stabilised This information is available via Modbus register see the Modbus Registers section Register 40066 STATUS and can also be signalled by digital output after previous selection and programming by Modbus This function is characterised by the two parameters AWeight and ATime The weight is considered stable whenever the net weightin the ATime has changed by a quantity lower than AWeight Digital input output The instrument offers the possibility to select either a digital input or a digital output This selection input or output is made only by DIP switch Digital Input allows to memorize the tare during all the calibration phases and may be used as an alternative to the lateral button On the normal functioning it may be used to acquire the temporary tare which will be lost at the turn off of the module at the next start up the tare value acquired on calibration will be loaded Digital Output the output can be configured via Modbus for three different operating modes and switches to ON or OFF status always according to Modbus setting whenever 1 The Gross Weight exceeds the Full Scale of the strain gauge Default Setting 2 The Weight is stable and the Net Weight exceeds the threshold set 3 The Weight is stable Analog Output The analo
5. s programming configuration must be the 1 0 2883 or later This software may be downloaded from the web site www seneca it During initial programming the EEPROM SW3 8 in OFF position default setting values originally programmed as follows can be used Address 1 SPEED 38400 baud PARITY none BIT NUMBER 8 STOP BIT 1 The module can also be programmed through the front connector COM while paying attention to set the following connection parameters Address 1 Speed 2400 Baud PARITY none STOP BIT 1 The Com communication port behaves in the same way as the RS485 bus port except for the communication parameters described above It also has priority over the RS485 serial port and closes after 10 seconds of inactivity SENECA s r l KaNet Via Germania 34 35127 Z I CAMIN PADOVA ITALY Tel 39 049 8705355 8705359 Fax 39 049 8706287 IS09001 2000 e mail info seneca it_ www seneca it SENECA M1001204 E ENGLISH 8 16 MODBUS REGISTERS Z SG has MODBUS 16 bits words registers accessible by RS485 or RS232 serial communication In the next paragraphs we shall describe the supported MODBUS commands and the functions of the registers Supported MODBUS Commands Code Function Description 03 Read Holding Registers Reading of word registers up to 16 at a time 04 Read Input Registers Reading of word registers up to 16 at a time 06 Write Single Re
6. the weight is stable and is expressed in units of 100 ms Weight is considered stable whenever the net weight WEIGHT_FLOAT 40064 65 in the ATime has changed by a quantity lt than AWeight Default Value 1 100 ms RESOLUTION DIGITAL_OUT_TYPE Sets the resolution and the shifting of the digital output if selected by DIP switch 40059 R W Bit 15 0 Resolution set by bit 14 8 1 24 bit Resolution Bit 14 8 If Bit 15 0 it sets the resolution value multiplied by 1000 Default 30000 monopolar points Bit 7 Defines the shifting of the output upon the appearance of the condition set by the Bit 6 0 O The output is normally opened and closes whenever the condition selected arises default 1 The output is normally closed and opens whenever the condition selected arises Bit 6 0 Defines the operation of the digital output and switches to ON or OFF according to the status of Bit 7 when any of the following conditions arise 0 The Gross Weight exceeds the Full Scale Default setting 1 The Weight is stable and the Net Weight exceeds the threshold set 2 The Weightis stable Net Weight WEIGHT_FLOAT 40064 65 SENECA M1001204 E ENGLISH 12 16 STATUS Status Register 40066 R W Bit 15 5 Notused Bit 4 Stable weight 1 signals that the weight is stable Bit 3 Memoriz
7. EPROM i e Fixed Address 01 S y y O jel Fixed Address 02 _ __ S y y O Je e Fixed Address 03 _ ____ y e Fixed Address 04 0 i X X xX x x x Fixed Address as from binary representation ej e e j j Fixed Address 63 _ ____ DIGITAL I O SELECTION ENABLING LATERAL BUTTON OF CALIBRATION SW2 1 Digital Input Besides it enables the lateral button of calibration e Digital Output __jele 420 mA TA l E MODE Modes 2 and 4 are selected e Modes 1 and 3 are selected The tare value acquired by the lateral button or digital input is saved on non volatile memory for Modes 2 and 4 eje Manual calibration of the strain gauge for Modes 1 and 3 The default configuration is the following Address 1 38400 no parity 1 stop bit For further informations consult the Calibration Addendum containing the calibration procedures SENECA M1001204 E ENGLISH 7 16 N GAUGE SENSITIVITY swel o eS Pt etm le 2myv_ S O lej tam S O Jele 8myv S O ej 16myv_ i O e fe 32mYV__ S O ele 61 d Sensitivity from MODBUS register SENSE_RATIO 40044 Real values not only integer may be set too 485 TERMINATOR pele Terminator OFF the SW3 2 is not used le x Terminator ON the SW3 2 is not used PROGRAMMING The release of Z NET3 software to be used for product
8. Max Voltage 30 V Other Features ADC 24 bit Thermal drift 25 ppm K Sampling frequency settable from 12 53 Hz to 151 71 Hz Interference rejection settable at either 50 Hz or 60 Hz Insulation voltage 1500 Vac between the measurement input and all the other circuits 1500 Vac between power supply and communication 1500 Vac between power supply and analog output Protection IP20 Environmental conditions Temperature 10 65 C Humidity 30 90 non condensing Altitude up to 2000 m a s l 20 85 C Power supply calibration RS485 communication Removable 3 way screw terminals 5 08 mm pitch Rear IDC10 connector for DIN rail 3 5 mm stereophonic front jack for RS232 COM connection Lateral button for strain gauge calibration Box PBT black Dimensions and weight 100 x 112 x 17 5 mm 140 g Reference standards EN61000 6 4 2002 electromagnetic emission industrial environment Storage temperature Signalling by LED Connections EN61000 6 2 2005 electromagnetic immunity industrial environment EN61010 1 2001 safety All circuits must be insulated from the other circuits under dangerous voltage with double insulation The power supply transformer must comply with EN60742 Insulated transformers and safety transformers SENECA MI001204 E ENGLISH 2 16 MODULE Z SG CALIBRATION The calibration procedures are illustrated in detail
9. UT_FL Limited 31000 31000 WEIGHT_FLOAT_H Register containing the net weight value in technical units of weight floating point format most significant word 40064 THRES FLOAT L Threshold in unit of weight floating point format least significant word 40055 R W WEIGHT_FLOAT_L Register containing the net weight value in technical units of weight floating point format least significant word 40065 SENECA M1001204 E ENGLISH 11 16 SENECA M1001204 E ENGLISH 13 16 AWEIGHT_FLOAT_H Weight variation in technical units accepted for stable weight floating point format most significant word 40056 R W Bit 15 0 With the Register 40058 ATime it permits to establish when the weight is stable This represents the variation in units of weight accepted for stable weight Weight is considered stable whenever the net weight WEIGHT_FLOAT 40064 65 in the ATime has changed by a quantity lt than AWeight Default 1 AWEIGHT_FLOAT_L Weight variation in technical units accepted for stable weight floating point format least significant word 40057 R W ATIME Time in units of 100 ms used to establish whether or not the weight is stable 40058 R W Bit 15 0 With the registers 40056 57 AWeight establishes whether or not
10. dress 1 SENECA MI001204 E ENGLISH 9 16 Bit 7 0 Set the type of parity control 00000000 No parity NONE Default 00000001 Even parity EVEN 00000010 Odd parity ODD BAUDR Register for the setting of the Baudrate and 40005 R W the response delay time in characters Bit 15 8 Set the serial communication speed value Baudrate 00000000 0x00 4800 Baud 00000001 0x01 9600 Baud 00000010 0x02 19200 Baud 00000011 0x03 38400 Baud Default 00000100 0x04 57600 Baud 00000101 0x05 115200 Baud 00000110 0x06 Not permitted 00000111 0x07 2400 Baud Bit 7 0 Set the response delay time in characters that represents the number of pauses of 6 characters each to be entered between the end of the Rx message and the start of the Tx message Default value 0 SENSE RATIO _FL_H Sensitivity of the strain gauge in mV V 40044 R W floating point format most significant word Bit 15 8 If the DIP switches SW2 7 8 9 are all in ON position the sensitivity of the strain gauge in mV V is set by this register floating point format most significant word SENSE RATIO FL_L Sensitivity of the strain gauge in _mV V 40045 R W floating point format least significant word FULL SCALE FL_H Full scale of the strain gauge in technical 40046 R W units floating point format most significant word Bi
11. etto provide either a digital input or digital output The connections in the two cases are as follows Digital Input Digital Output Load O 24 Vdc 24 Vdc INDICATIONS BY LED ON THE FRONTAL PANEL PWR LED GREEN Meaning o O Steady Power supply is present ERR LED YELLOW Meann SSS Steady Flashing Signallings relative to the calibration phases For further informations see the Calibration Addendum containing the calibration procedures RX LED RED Steady Data are being received through the RS485 communication port Steady Data are being transmitted through the RS485 communication port SERIAL INTERFACE For detailed information on RS485 serial interface consult the documentation provided by the website www seneca it in the section Prodotti Serie Z PC MODBUS TUTORIAL SENECA M1001204 E ENGLISH 6 16 DIP SWITCH SETTING The settings of the DIP switches define the module s communication parameters address and speed and other parameters we are going to explain In order for the setting modifications made to be confirmed valid the module must be switched off and on again In all the following tables the indication corresponds to a DIP switch set in ON no indication is provided when the DIP switch is set in OFF COMMUNICATION SPEED BAUDRATE swill o _ 9600 Baud e 19200 Baud fe 38400 Baud e e 57600 Baud ADDRESS swi 3 4 sfe 7 s oo y y Communication Parameters from E
12. g output permits the retransmission of the net weight as follows If the Net Weight in units of weight lt MINOUT the output relays 0 Ifthe Net Weight in units of weight gt MAXOUT the output relays 100 At intermediate values the progression is linear Where MINOUT and MAXOUT in Mode 1 and 2 may be set via MODBUS The default values are respectively 0 00 and 10000 00 Rejection at 50 and 60 Hz Rejection to interference at both 60 and 50 Hz can be enabled at the same time See Appendix A for details on setting and optimisation Calculation of Measurement Moving Average The moving average of a settable number of samples NR_SAMPLINGS 1 100 can be calculated In this way the Net Weight displayed is the calculated moving average value For Mode 1 and 2 NR_LSAMPLINGS may be set via MODBUS default 100 Installation rules The module is designed to be installed in vertical position on a DIN 46277 rail In order to ensure optimum performance and the longest working life the module s must be supplied adequate ventilation and no raceways or other objects that obstruct the ventilation slots Never install modules above sources of heat we recommend installation in the lower part of the control panel Electric connections RS485 SERIAL PORT AND POWER SUPPLY The electric connections for power supply can be made by using either the terminals or the bus for the Seneca DIN rail The RS485 bus connections are available only by using t
13. gister Writing of a word register 16 Write Multiple Registers Writing of word registers up to 16 at a time The two functions have the same effect HOLDING REGISTER The 16 bit Holding Registers have the following structure Most Significant bit Vv Least Bit Index Significant bit Vv Vv 15 14 13 12 44 10 9 817 6 5 4 3 2 4 0 Word 16 bits MODBUS Register The Bit notation x y shown in the table indicates all the bits from x to y For example Bit 2 1 indicates bit 2 and bit 1 and illustrates the meaning of the various linked combinations of the values of the two bits Remember that the MODBUS 3 4 6 and 16 single and multiple reading and writing functions can be executed on the following registers The following indication only readable or also writable is provided for every register R Readable W Writeable REGISTER Description ADD R W MACHINE ID Bit 15 8 contain the module s ID 23 40001 R hexadecimal 0x17 Bit 7 0 contain the firmware s revision FW_CODE Register that contains the firmware s internal 49002 R code HW_REL Register that contains the instrument s 40003 R hardware version ADDR Register for the setting of the module s 40004 R W address and parity control Bit 15 8 Set the module s address Permissible values from 0x00 to OxFF decimal values in the range of 0 255 Default ad
14. he bus for the DIN rail SENECA M1001204 E ENGLISH 4 16 Bus connector for DIN rail Power Supply AC Power Supply from terminals 2 O 10 40 Voc 2 0 W 3 OL 19 28 Vac RS485 GND RS485A Power Supply AC RS485 B There is no insulation between RS485 and the analog output RS232 SERIAL PORT Connection cable DB9 with a 3 5 mm stereo Jack can be assembled as indicated in the following figure or can be aunt as an accessory 3 5 mm Stereo Jack ANALOGUE INPUT GND Tx Rx The figure below shows the connections to be made for connection to a strain gauge The terminals have the following meaning 7 Strain gauge positive power supply 8 Strain gauge positive power supply reading 9 Strain gauge positive reading 10 Strain gauge negative power supply 11 Strain gauge negative power supply reading 12 Strain gauge negative reading The use of shield cables is necessary for the electronic connections 6 wires measurement 4 wires measurement Excitation 7 Excitation 11 10 Excitation SENECA M1001204 E ENGLISH 5 16 ANALOG OUTPUT The module provides an analog output in voltage 0 10 VDc 0 5 VDC or current 0 20 mA 4 20 mA We recommend using shielded cables for the electric connections above l l iret a i Current a S i P i Output l 5 Qa 5 O There is no insulation between RS485 and the analog output DIGITAL INPUT OUTPUT The module can be s
15. ich the moving average must be calculated The WEIGHT_FLOAT Register provides the mean value calculated Permissible values 1 100 Default 100 ADC_VAL Filtered ADC value 40062 Bit 15 8 Value of the net weight in technical units which corresponds to the minimum value of the analog output 0 The value is in floating point format most significant word and so referred to the net weight in floating point format Default 0 00 WEIGHT_SHORT Net weight value in 30000 scale 40063 MINOUT_FL_L Value of the net weight in technical units of weight which corresponds to the minimum value of the analog output floating point format least significant word 40053 R W THRES_FLOAT_H Threshold in unit of weight floating point format most significant word 40054 R W Bit 15 0 If the net weight WEIGHT_FLOAT 40064 65 exceeds the threshold value set and the weight is stable the digital output whenever set in the second operating mode is closed or opened Default 0 00 Net weight value in 30000 scale Equal to 0 if the WEIGHT_FLOAT 40064 65 is equal to MINOUT_FL 40052 53 value of the weight corresponding to the minimum value of the analog output Equal to 30000 if the WEIGHT_FLOAT is equal to MAXOUT_FL 40050 51 value of the weight corrisponding to the maximum value of the analog output Values lt 0 if WEIGHT _FLOAT lt MINO
16. ing of the tare on volatile memory 1 a memorizing of the tare is required the value is valid up to the next start up of the module Bit 2 Gross Weight lt Memorized Tare 1 signals that the gross weight is lt Tare value saved in memory Bit 1 Gross Weight gt Max Full Scale of the strain gauge 1 signals that the gross weight is gt Maximum allowed Full Scale Bit 0 Alarm Status 1 It signals that the net weight value has exceeded the threshold and that the weight is stable STATUS_DIP SWITCH Status of the Dip switches 40067 R Bit 15 Indicates the status of DIP1 SW1 Bit 14 Indicates the status of DIP2 SW1 Bit 13 Indicates the status of DIP3 SW1 Bit 12 Indicates the status of DIP4 SW1 Bit 11 Indicates the status of DIP5 SW1 Bit 10 Indicates the status of DIP6 SW1 Bit 9 Indicates the status of DIP7 SW1 Bit 8 Indicates the status of DIP8 SW1 Bit 7 Indicates the status of DIP1 SW2 Bit 6 Indicates the status of DIP2 SW2 Bit 5 Indicates the status of DIP3 SW2 Bit 4 Indicates the status of DIP4 SW2 Bit 3 Indicates the status of DIP5 SW2 Bit 2 Indicates the status of DIP6 SW2 Bit 1 Indicates the status of DIP7 SW2 Bit 0 Indicates the status of DIP8 SW2 COMMAND Commands Register 40068 R W Bit 15 0 By inserting the next codes the following actions are performed 43948 OxABAC Module reset 49594 0xC1BA Save the tare in volatile memory 49914 OxC2FA Save the tare in volatile
17. on the appropriate attached addendum Anyway they are briefly listed below Calibration Mode 1 The user has at his disposal a PC with Z NET3 software release 1 02883 or later to download from www seneca it web site and a weight of known value It is not necessary that the known weight is equal to the full scale of the strain gauge or to the full scale of the measurement Calibration Mode 2 The user has at his disposal a PC with Z NET3 software and a strain gauge with declared sensitivity Calibration Mode 3 The user does not have at his disposal a PC but has a weight of known value equal to the full scale of measurement Calibration Mode 4 The user does not have at his disposal a PC and a weight of known value but has only a strain gauge with declared sensitivity DIP switch Position Lateral button for calibration Frontal Panel and Leds Calibration Button ERR PWR Sw teaaadd Sw ieee To use the lateral button for calibration move to OFF position the DIP switch 1 of SW2 DESCRIPTION OF OPERATION The strain gauge s measured value is translated into an analog output signal current or voltage The measurement of the input is available through Modbus RTU protocol upon query by RS485 bus and or RS232 jack Serial communication parameter settings can be made either by Modbus RTU or DIP switch whereas the settings selectable via SW2 cannot be configured via Modbus except the sensitivity The instrument s various
18. provides the values of these parameters according to the value set in this register Default value 82 0x0052 corresponding to the Sampling Frequency 49 95 Hz Rejection at 50 Hz and 60 Hz Enabled NRSAMPLINGS_TARE Sets the number of samplings of the ADC upon which the moving average will be calculated and indicates the tare value used 40061 R W Bit 15 8 Value of the net weight in technical units of weight which corresponds to the maximum value of the analog output 100 The value is in floating point format most significant word and so it has to be referred to the net weight in floating point format Default 10000 00 Bit 15 9 Not used MAXOUT_FL_L Value of the net weight in technical units of weight which corresponds to the maximum value of the analog output floating point format least significant word 40051 R W Bit 8 Used Tare value only for Modes 2 and 4 0 the value of the tare had not never been written on the memory at the start up the factory value will be loaded 1 the value of the tare had been written at least once on the memory at the start the last set value will be loaded MINOUT_FL_H Value of the net weight in technical units of weight which corresponds to the minimum value of the analog output floating point format most significant word 40052 R W Bit 7 0 The number of samplings upon wh
19. t 15 8 If the full scale of the strain gauge is declared Mode 2 with both SW2 4 5 in OFF position sets the full scale of the strain gauge in technical units of weight kg pounds etc Floating point Format most significant word Default 10000 00 FULL SCALE _FL_L Full scale of the strain gauge in technical 40047 R W units floating point format least significant word KNOWN Known weight of the strain gauge in technical 40048 R W WEIGHT_FL_H units floating point format most significant word Bit 15 8 If the full scale of the strain gauge is not declared SENECA MI001204 E ENGLISH 10 16 Mode 1 SW2 4 OFF and SW2 5 ON it sets the known weight of the strain gauge in technical units of weight kg pounds etc Floating point format most significant word Default 10000 00 CONFIG FREQ_REJ Configuration register for setting of rejection and sampling frequency 40060 R W KNOWN WEIGHT_FL_L Known weight of the strain gauge in technical units of weight floating point format least significant word 40049 R W MAXOUT_FL_H Value of the net weight in technical units of weight which corresponds to the maximum value of the analog output floating point format most significant word 40050 R W Bit 15 0 The value of this register sets the sampling frequency and the characteristics interference rejection Appendix A
20. xceeded Measurement stabilisation through the calculation of the moving average value of a programmable number of samplings Complete configurability by Z NET3 software Technical Specifications Power supply Consumption e e e o e e e e o e e e e e 10 40 Vde or 19 28 Vac 50 60 Hz max 2 0 W RS485 2400 115200 Baud RS232 2400 Baud Address 01 Parity NO Data 8 bits Stop bits 1 Communication Ports Protocol MODBUS RTU Analog Input Input Type 6 wires or 4 wires differential measurement input Full scale 5mvV 320 mV Error Calibration 0 01 ofthe full scale value Linearity 0 01 ofthe full scale value Thermal Stability 0 0025 C ofthe full scale value Insulation 1500 Vac respect to the remaining circuits SENECA MI001204 E ENGLISH 1 16 Strain gauge characteristics Power supply voltage 5 Vdc Minimum impedance 87 Q equivalent derived from several strain gauges connected in parallel Sensitivity From 1mV V to 64 mV V Terminals 4or6 Analog Output Output Voltage 0 10 Vdc 0 5 Vdc minimum load resistance 2 kQ Output Current 0 20 mA 4 20 mA maximum load resistance 500 Q Transmission error 0 1 max range Response time 10 90 5ms Digital Input or Output as alternative Optoisolated digital Input Max Voltage 30 V Optoisolated digital Output Max Current 50 mA
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