70 Series Modbus Protocol Manual
Contents
1. I 1 32768 150 Volt AAA V ss V3 E Mi Total RE E SIS E i El es 1 32768 4500 Amp a Volt Scale Scale 40009 Le Total E Scale Volt E 32768 32767 1 32768 4500 Amp Scale Volt Scale Scale vars 0 LO HE E Tl o TE i ne Scale Amp Scale Volt 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale 3 40012 Watts C T5 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale W Scale 3 40013 VARs A T5 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale vars 3 40014 VARs B T5 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale vars 40015 VARs C Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale vars iw 0 TA 0 DT 33 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address AAA e SE II A A ST rr e DT pete e areas A A _ oo fg e eer NEI AE ee We Kg Dee DA CS e O E d eee ENA AAA AL RRA eee em ee SU cc A AAA dl cc EE AR il PR VAS A Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale a VAs B Data 32767 1 32768 1500 Amp Scale Volt Scale VAs VAs C Data 32767 1 32768 1500 Amp Scale Volt Scale VAs 34 ML0037 September 8 2011 Copyright 2011 Bitro2. be edited The TUC or Totally User Configurable register sets are intended to allow you to define your own custom register sets There are two independent custom register sets TUC1 and TUC2 The button next to the Register set dropdown list changes from View Registers to Edit Registers when one of these editable register sets is selected Click on Edit Registers to begin configuring a register set The View Registers Edit Registers button brings you to the Modbus Register Configuration page A register summary list is shown which includes the register number measurement name and calculation type of the selected register set 40017 ter Measurement Health RMS Amps A RMS Amps B RMS Amps C RMS Volts A RMS Volts B RMS Volts C RMS Watts Total RMS VARs Total RMS Watts A RMS Watts B RMS Watts C RMS VARs A RMS VARs B RMS VARs C CT Scale Factor Normalized Ratio VT Seale Fartnr Narmalized Ratin Click the Edit List button to modify the register list This button Calc Type B16_LOC_HEALTH_LO B16_2S_10_M10 B16_2S_10_M10 B16_2S_10_M10 816 28 150 0 816 28 150 0 816 28 150 0 816 28 4500 0 816 28 4500 0 816 28 1500 0 816 28 1500 0 816 28 1500 0 816 28 1500 0 816 28 1500 0 816 28 1500 0 B16W_RATIO_NORMAL R1RW RATIA NORMAI standard non editable register sets All available measurements and data are ML0037 is disabled for the Available j Selecte
3. Bitronics 50 Series SCADA Meters Modbus Manual September 8 2011 ML0037 Document Revision E 2011 by Bitronics LLC lt NovaTech Bitronics D 3 Orion ML0037 September 8 2011 Copyright 2011 Bitronics LLC TABLE OF CONTENTS 50 SERIES MANUAL SET nn c0iecssdcccccscodesesesdcvacdesasesedectcnscnesecetecestcvsdusssvetececesussesssedsoadetsnoss ededanddendsseevaccancddenevstedsecceades 5 5 CERTIFICATION EE 6 INSTALLATION AND MAINTENANCE 5 c cccessccccsaccscoosesscoccconnscstecesdeconuesdvetensacecasvsccctendosedaseusdendsstadsdevesssencensassseversddacsss 6 WARRANTY AND ASSISTANCE 20 220 ccscsccincccccssngsiecocecsctsusescsscvcecestsesescescucssesssescdcsadedenssdsetecdcecesndvessescadatensessstecsncdecdsseses 6 COPYRIGHTANOTICE E 7 TRADEMARKS 2 24 64 7 SAFETY SECTION WE H 1 0 MODBUS INTERFACE 20 2 4122 8 1 8 152 Modbus Address cea io Lo ala ert Mabie ce ASSAR a 8 onset 8 VA Data Formatuen moniu or ao i ana ROL 8 1 4 1 Modbus Calculation Type Codes ii 10 1 COMPIQUIATION ER 13 1 5 1 Setting CT and A OI A er 13 1 5 2 Resetting Energy and Demands iii 14 13 AU E An ul alal eek eal oud eek aaa aaa e EES 14 1 6 Register Sets and Register Types AA 14 14 ERa ER E E EEA AEAEE E AAEN EIE A ESEA EA ETATE E EAEN A 16 1 9 Heartbeat Slate 16 1 10 Meter 16 1 11 Custom Register 15 AA aa 16 2 0
4. 0 Register count low Read 2 registers total 8 fones Ja Notes RESPONSE Function Code 03 Read Holding Registers Byte Name Example Notes EM Slave Address 2 Function code 2 3 Brecon fa 2registers 2 bytes each Data high 40008 E Watts Total 6670 hex 26224 decimal 5 Data low 40008 70 6 Data high 40009 66 VARs Total 6650 hex 26192 decimal 7 Data low 40009 CRC 16 low CE MEM CN 21 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 2 6 2 Preset Single Register Function Code 06 This function writes to a single register An attempt to write to a READ ONLY register results in an exception response The response to a valid writeable register command is an echo of the command The following example shows reset Energy command by writing 1 to register 40100 COMMAND and RESPONSE Function Code 06 Preset Single Register Byte Name Example Notes 2 Function code fe 3 Stat address 5 Data high E 7 e CN 2 6 3 Preset Multiple Registers Function Code 16 0063 hex 99 to specify register 40100 This function writes one or more contiguous registers An attempt to write to a READ ONLY register results in an exception The following example shows writing the Reset registers 40100 40103 COMMAND Function Code 16 Preset Multiple Registers Byte Name Example Notes Slave Address 10 hex 16 decimal Start address high
5. 00 63 hex 99 decimal 40100 reset energy 4 Start address low 63 Register count high__ 00 We write 4 registers 40100 40103 6 Register count low 7 Byte count 08 Fourregister 8 bytes Data High joo Write 1 to register 40100 Reset energy e aaow fo Data nigh joo Write 1 to register 40101 Reset demand amps Datalow JI Data hign 00 Write 1 to register 40102 Reset demand volts Data non S Write 1 to register 40103 Reset demand power Data low CRC 16 low 22 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 3 0 MODBUS OVER ETHERNET TCP If the 50 Series meter is equipped with the Ethernet port enabled for protocols then it will respond to Modbus commands via TCP The 50 Series can communicate with any device certified by Schneider Automation Inc for Modbus over Ethernet as well as other devices The 50 Series meters can support either Modbus or DNP3 and HTML protocols over the Ethernet link but must be set the same as the serial port if the device is equipped with one The table below lists default port assignments for all Ethernet based protocols supported by the 50 Series Protocol Port number DNP3 20000 TCP UDP ms sono HTML 80 TCP The Modbus TCP interface allows up to 8 simultaneous connections to 50 Series meters The configuration parameters are described in Appendix C Any Unit_ld including zero will be accepted since there is only one device per IP addr
6. 5 ratio CT and a 100 1 CT will have a value of 100 stored For example to calculate a CT and VT ratio for Phase A from the data stored in the M650 use the following equation 40041 Phase A CT Ratio Divisor 40042 Phase A PT 4004 Phase A PT no OBE Value 40043 Phase A PT Ratio Divisor 40044 The M650 M651 meters calculate all measured quantities in SECONDARY UNITS except energy like other Bitronics instruments such as MultiComm and PowerPlex The CT and VT ratio information is used to calculate the primary values In the event of a CT VT Ratio Checksum Failure the value in the Normalized CT Ratio and Normalized VT Ratio registers default to 1000 and the value in the CT Ratio Divisor and VT Ratio Divisor default to 1000 This results in a 1 1 CT Ratio and 1 1 VT Ratio WARNING TO PRESERVE SYSTEM PERFORMANCE ONLY WRITE TO RATIO REGISTERS WHEN THE RATIOS NEED TO BE CHANGED 13 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 1 5 2 Resetting Energy and Demands The Energy and Demand registers can be RESET by writing a non zero value to the appropriate Holding Registers Reset Functions Reset Energy Reset Demand Amps Reset Demand Volts Reset Demand Power 1 5 3 Tag Register The 50 Series meters provide a TAG register for user identification purposes This register is a READ WRITE register that allows the user to write a number from 0 to 65 535 in the tag register The tag register is stored
7. Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address el en AA TT el el lb Pr ee As A i A E AA TI eee TT A td A 40100 Reset Energy T22 ES Setting PIC LEE Tr 3 6 16 Reset Demand Amps joe 4 Setting M350 A3 TT 6 16 40102 Reset Demand Volts Setting 1 M350 V3 TT 00 3 6 16 40103 Reset Demand Power A Setting BS vas iL 38 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address Bee di a A LC AAA A AAA A Ma i A A lA s eee A dl O ee T g Ol tes RE ETC gh ENE CCL qa Gita ice de Eco oe CEST rr n SUE e 5 AAA AA AA A AAA AO R ar eee 8 cale OT TTT ee ere ee EH A cale ee A l e eee E cale Scale ee 40124 Max Average VARs B T6 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale e dl TT 8 39 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies i Step Address 3 40126 Max Average VAs A T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAs 3 40127 Max Average VAs B T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Sca
8. C MODBUS CONFIGURATION PARAMETERS Configuration Parameter Modbus Session Description Default or Options Session The number of the session you are configuring Option of 1 8 default is 1 Type The session type Option RTU TCP default is RTU Slave address The source address for the selected session Default is 1 Points List The register set to be used for the meter The options are the Bitronics Legacy Fixed BiLF 12 bit or 16 bit Default is BiLF12 Tag Register Location of the tag register Default is 0 Receive Frame Timeout ms Serial Maximum amount of time ms to wait for a complete frame after receiving valid frame sync characters Default is 4000 ms Inter Character Timeout ms The amount of time ms of silence at the end of a frame before timeout At 9600 baud 4 ms is 4 character times Default is 4 ms Accommodation Factors these are the maximum allowable values Some older RTUs may not be able to accommodate the maximum and the settings can be reduced to work with those RTUs Delimiter 1 Delimiter 1 and 2 are used only with Modbus ASCII for Default is 13 carriage return and line feed Delimiter 2 Delimiter 1 and 2 are used only with Modbus ASCII for Default is10 carriage return and line feed Legacy RTU For this and all of the remaining items in this section Max Holding Regs to Read Default is 125 Max Holding Regs to
9. Example 1234 5 stored as 12345 Unsigned 16 Bit Integer Normalized Ratio ratio Normalized Ratio Ratio Divisor Example 1 234 12 34 123 4 and 1234 are all stored as 1234 Unsigned 16 Bit Integer Ratio Divisor ratio Normalized Ratio Ratio Divisor valid Ratio Divisors are 1 10 100 1000 Example X XXX stored as 1000 XX XX stored as 100 XXX X stored as 10 Signed 16 Bit 2 s Complement Saturation 2 Gain Value Integer Value 16384 Example 0 250 stored as 4096 Float Value Integer Value 2047 2048 Scale 10 Value 2047 AMPERES inst Fund Demand Max 3048 X10 CT ratio Example 5 0 A stored as 3071 when Amp Scale 1 1 Unsigned 16 Bit Integer 12 Bit Offset Binary Saturation 150 Float Value Integer Value 2047 2048 Scale 150 Value 2047 N Inst Fund Demand Min Max x 150 x VOLTS L N inst Fund Demand Min Max 2048 PT ratio Example 119 97 V stored as 3685 when Volt Scale 1 1 Unsigned 16 Bit Integer 12 Bit Offset Binary Saturation 1000 Float Value Integer Value 2047 2048 Scale 1000 Value 2047 WATTS VARs VAS prr PHASE Inst 2048 x 1000 x PT ratio X CT ratio Example 500 W stored as 1023 when Volt Scale 1 1 Amp Scale 1 1 Unsigned 16 Bit Integer 12 Bit Offset Binary Saturation 3000 Float Value Integer Value 2047 2048 Scale 0 Value 2047 WATTs VARs VAs lant ins Dem
10. MODBUS rioni eri arrangiarsi 19 251 Introduction 0 19 3 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 2 2 MODBUS RTU Message Framing i 19 2 3 MODBUS RTU 00 19 2 4 MODBUS Function Codes eger 2 0 cedar ania A A AA 19 2 5 MODBUS Exception 2001086 20 2 6 Supported MODBUS Commande Ne 20 2 6 1 Read Holding Registers Function Code 03 21 2 6 2 Preset Single Register Function Code 06 22 2 6 3 Preset Multiple Registers Function Code 16 22 3 0 MODBUS OVER ETHERNET 6 etgee dergdeeded deiere eege ege ee deed ee Nee EENEG 23 3 0 1 55 nenesinin a a e A a a a a a aa e a 23 Appendix A Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 1 24 Appendix B Bitronics Legacy Modbus Register Assignments BiLF16 16 bit ee 32 Appendix C Modbus Configuration Parameters ssscccccssssssssececcccccsssssseeccccccuassseeeeccccccacsseeeeesecsaaaseeeeeesccoaagssseees 43 4 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 50 SERIES MANUAL SET ML0035 ML0036 ML0037 ML0038 ML0039 ML0040 M650 Family User Manual 50 Series DNP3 Protocol 50 Series Modbus Protocol M350 Family User Manual M651 Family User Manual M653 Family User Manual VERSION HISTORY ABRIDGED V1 010 V1 030 V1 040 V1
11. Optimal Resolution on the basis that resolution of the protocols are optimized based on secondary full scale and therefore independent of CT and VT settings The Primary Units mode creates protocol values that include CT and VT settings which 14 ML0037 September 8 2011 Copyright 2011 Bitronics LLC requires the user to choose a scaling factor in multiples of 10 The scaling factor must be selected such that it achieves the desired resolution and does not cause an overflow in the protocol value The Scaling mode selection and the scaling factors are maintained separately for both Modbus and DNP and are configured on the Settings Protocol webpage Below is a screen shot and explanation of the Primary Units mode Scaling _ Optimal Resolution 9 Primary Units Amps per count 0 100 x Volts per count 1 000 D Watts per count 10 00 E There are three new configurable parameters e Amps per count APC e Volts per count VPC e Watts per count WPC There are three new calculation types e Currents B16 25 PRIMARY Measurement Protocol Value APC e Voltages B16_2S PRIMARY_V Measurement Protocol Value VPC e Powers B16 2S PRIMARY P Measurement Protocol Value WPC When Primary Unit mode is selected appropriate calculation types are substituted per the following table This substitution occurs across all pre defined and user configured register sets Note other calculation types are unaffected as they represent their
12. Write TCP IP Default is 125 IP Address The IP address of the master a value of 0 allows any IP address to connect Default is 0 0 0 0 IED Listen Port The port that the 50 Series IED listens on Default is 502 ML0037 43 September 8 2011 Copyright 2011 Bitronics LLC 3 15 10 B 4 15 10 T Update for email address change 5 31 10 Added M350 references and added registers 40115 40159 BiLF16 D 2 14 11 Added M651 and custom register set references 9 08 11 Added Primary Units ML0037 September 8 2011 44 Copyright 2011 Bitronics LLC 44 NovaTech Bitronics D 3 Orion Bitronics LLC 261 Brodhead Road Bethlehem PA 18017 610 997 5100 Fax 610 997 5450 www novatechweb com bitronics
13. and software that is protected by copyrights owned by one or more of the following entities Bitronics LLC 261 Brodhead Road Bethlehem PA 18017 Schneider Automation Inc One High Street North Andover MA 01845 Triangle MicroWorks Inc 2213 Middlefield Court Raleigh NC 27615 Freescale Semiconductor Inc 6501 William Cannon Drive West Austin TX 78735 USA gzip inflation uses code Copyright 2002 2008 Mark Adler inarp uses WinPcap which is Copyright 1999 2005 NetGroup Politecnico di Torino Italy and 2005 2010 CACE Technologies Davis California TRADEMARKS The following are trademarks or registered trademarks of Bitronics LLC The Bitronics logo Bitronics PowerPlex Triplex Triple ll MultiComm PowerServe SubCycle Technology SubCycleStuf The following are trademarks or registered trademarks of the DNP User s Group DNP DNP3 The following are trademarks or registered trademarks of Schneider Automation Inc MODSOFT Modicon Modbus Plus Modbus Compact 984 PLC SAFETY SECTION Please refer to the M650 User Manual ML0035 the M350 User Manual ML0038 or the M651 User Manual ML0039 for information regarding safety installation commissioning and decommissioning ML0037 September 8 2011 Copyright 2011 Bitronics LLC 1 0 MODBUS INTERFACE 1 1 Description The 50 Series meters support the Modbus protocol on the serial ports This port can be configured for RS 232 or RS 485 Refer to the M650 and M350 User Manua
14. one byte exception code upon errors The check bytes are generated using the CRC 16 polynomial generator sequence x16 x15 x2 1 with the remainder pre initialized to all 1 s The most significant byte of the CRC is transmitted first 2 4 MODBUS Function Codes 19 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics instruments currently support the function codes shown in the following table Note that the values are shown in hexadecimal base 16 This table also shows the value that a slave would return upon an error MODBUS Function Codes Master Slave Meaning Function Error Read Holding Registers Read values from transducer 066 866 PresetSingle Register Write ratio or reset energy demand Preset Multiple Registers Write ratio or reset energy demand 2 5 MODBUS Exception Codes Bitronics instruments return exception codes back to the master upon certain conditions All functions codes greater then 127 decimal 7Fie or 0x7F indicate a slave error response The message byte indicates the exception code according to the following table MODBUS Exception Codes Meaning Illegal Function Master command contained an unrecognized function code 2 Illegal Data Starting address is illegal Note that some registers are read only and some Address are read write 3 Illegal Data Either the register count is invalid or an attempt to write an illegal register Value value was found Note that this code can be cau
15. values such as Frequency Power factor in primary units even in Optimal Resolution mode Also since the 12 bit calculation types are not included in the substitution this means that the Modbus BiLF12 register set is not affected Modbus DNP Optimal Replaced by Manual Resolution Calculation Type Calculation Type T2 T2 B16 25 10 M10 B16 25 PRIMARY T3 T3 B16 2S 15 5 16 25 PRIMARY T4 T4 B16 25 150 M150 B16 25 PRIMARY V T23 T23 B16 2S 300 M300 B16 2S PRIMARY V na na B16 25 600 M600 B16 25 MULT 10 Power supply voltage T5 T5 Pip 2S 1500 M1500 B16 25 PRIMARY P T6 T6 16 25 4500 M4500 B16_2S PRIMARY 15 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 1 8 Health Check The 50 Series has several self tests built in to ensure that the instrument is performing accurately The results of these self tests are available in the Health Check register 40001 which is a simple 16 bit binary value Each bit represents the results of a particular self test with 0 indicating the test was passed and 1 indicating the test was failed If Health status failures occur the meter may have experienced an operational failure The table below provides a reference of error codes Contact the factory for further instructions Health Check Error Codes Description 0 Checksum error on analog output either 0 1mA or 4 20mA calibration constants 2 Checksum error on gain calibration of inputs 4 C
16. 050 V1 060 V1 070 V1 090 V2 010 V3 000 ML0037 2010 03 25 2010 05 14 2010 06 17 2010 07 14 2010 07 20 2010 08 03 2010 10 27 2011 02 18 2011 09 08 M650M3x51x models with firmware download capability Add 0 1mA add per phase power demands to protocols Add M350 models add configurable display screens Add secondary volts screens more info to front panel menu Add support for B3 models Add support for 1A input and 4 20mA output Add support for M651 models Add support for configurable points Add support for M653 models split core CTs passwords analog events Primary Units September 8 2011 Copyright 2011 Bitronics LLC CERTIFICATION Bitronics LLC certifies that the calibration of our products is based on measurements using equipment whose calibration is traceable to the United States National Institute of Standards Technology NIST INSTALLATION AND MAINTENANCE Bitronics LLC products are designed for ease of installation and maintenance As with any product of this nature installation and maintenance can present electrical hazards and should be performed only by properly trained and qualified personnel If the equipment is used in a manner not specified by Bitronics LLC the protection provided by the equipment may be impaired WARRANTY AND ASSISTANCE This product is warranted against defects in materials and workmanship for a period of thirty six 36 months from the date of their original shipment from the fact
17. 48 3000 Amp Scale Volt Scale W 0 1 2048 3000 Amp Scale Volt Scale vars 4095 1 2048 3000 Amp Scale Volt Scale vars 4095 1 2048 3000 Amp Scale Volt Scale vars Data 2047 4095 1 2048 3000 Amp Scale Volt Scale VAS Data 2047 4095 1 2048 3000 Amp Scale Volt Scale VAS Data 2047 4095 1 2048 3000 Amp Scale Volt Scale VAS Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address AA E AA AE A PPP E A AE Sa Ar eee A AA E a ne A A A ee AA SAA ARA ege ee ATi n oo plot IPT NESTE o A E 0 E EE Si ERC o A cl rl ED AA es An E o el IE i er E re Pile RE d 29 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address Eee ee AAA TT el ea NA o Pr er 1 lt C eee o A lh AAT dle e DE SI O RR 3 6 16 40100 Reset Energy Setting 65536 65536 Po i KEE TI 3 6 16 Reset Demand Amps fie 4 Setting 65536 65536 M350 A3 TT 3 6 16 40102 Reset Demand Volts T20 Setting 65536 65536 M350 V3 1 ee 6 16 40103 Reset Demand Power T20 oe Setting 65536 65536 Ra FEL A DA
18. 5 T22 T23 T24 12 ML0037 September 8 2011 Copyright 2011 Bitronics LLC The above equations provide answers in basic units VOLTs AMPs WATTS VARs VAs and Hz If the user desires other units such as KILOVOLTS KILOWATTS or KILOVARS the answers given by the equations should be divided by 1 000 If the user desires MEGAWATTS or MEGAVARS the answers given by the equations should be divided by 1 000 000 Energy values are in units of kWh or kVARh The Value referred to in the equations would be the value stored in the register that you wished to convert to engineering units For example if you wanted to convert Phase A Amperes into engineering units Value would be the value in 40003 ENERGY is stored as 32 BIT values in static COUNTER registers Energy values are in units of PRIMARY kWh or kVARh 1 5 Configuration 1 5 1 Setting CT and VT Ratios The 50 Series meters are capable of internally storing and recalling CT and VT ratios The CT and VT ratios are set using the web configuration interface and are stored in non volatile memory on the CT VT section of the power supply board Ratios can be read from registers 40041 through 40044 Each ratio is stored in two registers one for the Normalized Ratio and the other for the Ratio Divisor Allowable constants for the normalized ratios are 1000 to 9999 The Ratio Divisors may be 1 10 100 or 1000 only The number stored will be the high side rating of the CT Ratio or VT Ratio Both a 500
19. A a a I O e a e a Pa G e re CE AAA AA 30 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address 40108 Volts CA Scale AO dl 2047 4095 1 2048 150 Volt Scale V M350 V3 40109 pere Max Volts AB paa Scale PRF 2047 4095 1 2048 150 Volt Scale V M350 V3 A I a I e E eg nr AAA ee O A Y e Ed O ee Coe Pe ee e eb e When connected to 2 Element DELTA or 3 wire systems the Per Element quantities may have no direct physical meaning All registers are available in M650 M651 although some don t apply for B3 models registers available in M350 A3 or V3 are indicated under Meter 31 ML0037 September 8 2011 Copyright 2011 Bitronics LLC APPENDIX B BITRONICS LEGACY MODBUS REGISTER ASSIGNMENTS BILF16 16 BIT Note that all registers are available in M650 M651 although some don t apply for B3 registers for M350 A3 or V3 are indicated under the Meter column Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address 40001 Health 0 Data 0 Norm 1 Fail E 1 zero Error 32 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address 8 e E ee e eege R eg er e A A AAA E ees fome fre Trimmer ES E MESA EE
20. Volt Re SR 32768 32767 1 32768 1500 Amp Scale Volt Scale i Scale 40141 Min Average VARs A T6 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 3 40142 Min Average VARs B T6 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 40143 Min Average VARs C T6 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 40144 Min Average VAs A T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAs n 40145 BE Average VAs B Pi Scale Volt REIS RS 32767 1 32768 1500 Amp Scale Volt Scale Scale VAS 40 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies i Step Address 40146 Min Average VAs C Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAS ee Ne e El CPP Pi tese EE 401 o vir E e ED def SE il Cole A I dici Ee When connected to 2 Element DELTA or 3 wire systems the Per Element quantities may have no direct physical meaning All registers are available in M650 M651 although some don t apply to B3 registers available in M350 A3 or V3 are indicated under Meter 41 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 42 ML0037 September 8 2011 Copyright 2011 Bitronics LLC APPENDIX
21. ale 1 1 Signed 16 Bit Integer 2 s Complement Saturation 15 Float Value Integer Value 32768 Scale 15 Value 32768 Example 150 A stored as 16384 when Amp Scale 20 1 Signed 16 Bit Integer 2 s Complement Saturation 150 Float Value Integer Value 32768 Scale 150 VOLT Sap S L N Inst Fund Demand Min Max 32 768 RATIO AMPERES y ins Fund Demand Max x 15 x CT RATIO Example 119 998 V stored as 26214 when Volt Scale 1 1 Signed 16 Bit Integer 2 s Complement Saturation 1500 Float Value Integer Value 32768 Scale 1500 Value WATTS VARs VAS per pHASE ns 32768 Xx 1500 x PT ratio X CT raro Example 750 0 W stored as 16384 when Volt Scale 1 1 Amp Scale 1 1 Signed 16 Bit Integer 2 s Complement Saturation 4500 Float Value Integer Value 32768 Scale 4500 Value WATTS VARs VAs Jroraz ns Demand Min Max 32768 x 4500 X PT ratio CT rario Example 90 0 kW stored as 8192 when Volt Scale 20 1 Amp Scale 4 1 Signed 16 Bit Integer 2 s Complement 3 Decimal Places Value POWER FACTOR true Displacement 1000 10 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Type Value Bit Mask Description E 12 345 stored as 12345 Signed 16 Bit Integer 2 s Complement 2 Decimal Places FREQUENCY Ste 100 Example 123 45 stored as 12345 4 Signed 16 Bit Integer 2 s Complement 1 Decimal Place
22. and Min Max 2048 x 3000 x PT ratio X CT ratio a Unsigned 16 Bit Integer 12 Bit Offset Binary Saturation 10 11 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Type Value BitMask Description Example 349 10 kW stored as 3040 when Volt Scale 6 1 Amp Scale 40 1 Unsigned 16 Bit Integer 12 Bit Offset Binary Saturation 15 Float Value Integer Value 2047 2048 Scale 15 AMPERE AE CT SN Inst Fund Demand Max 2048 RATIO Example 11 79 A stored as 2369 when Amp Scale 5 1 Unsigned 16 Bit Integer 12 Bit Offset Binary 1 Decimal Place Float Value Integer Value 2047 10 Example 121 4 degrees stored as 3261 Unsigned 16 Bit Integer Bit Control Status 0 stored as zero 1 stored as 65536 Unsigned 16 Bit Integer 3 Decimal Places Example 54 321 stored as 54321 Bit Example 1 bit is set 0 bit is clear Signed 16 Bit Integer 2 s complement Saturation 300 Float Value Integer Value 32768 Scale 300 Example 207 846 V stored as 22702 when Volt Scale 1 1 Signed 16 Bit Integer 2 s Complement 3 Decimal Places offset by 60 Float Value Integer Value 1000 60 0 Example 60 005Hz stored as 5 T19 Unsigned 16 Bit Integer 12 Bit Offset Binary 3 Decimal Place Float Value Integer Value 2047 1000 Value 2047 PF True Displacement 1000 Example 0 978 Power Factor stored as 302
23. anual MODICON MODBUS PROTOCOL REFERENCE GUIDE PI MBUS 300 may be purchased for a nominal fee directly from Modicon Inc 2 2 MODBUS RTU Message Framing Each message from either a master or slave consists of a continuous stream of characters A silent interval of 3 5 character times 3 5 11 bits 9600 baud 3 5 millisecond or more separates these streams Bitronics 50 Series instruments implement this requirement by waiting for a 4 millisecond configurable gap between characters If the stream is valid and is addressed to this instrument then the instrument responds as follows Enable the output interface drivers RS 485 option only Wait TX Delay time if configured Send the response as a continuous stream Disable the output interface drivers RS 485 option only 2 3 MODBUS RTU Message Content The MODBUS RTU message stream consists of an address byte a function code byte a number of message bytes and two check bytes The address byte which is in the range 1 247 specifies the identity of the slave device The function code byte in a master command indicates the operation that the slave is to perform The function code byte in a slave response is the same value as the master command function code if no error occurs otherwise it has 128 added to it The message bytes in a command contain additional information needed to perform the command Message bytes in a response contain the data requested if no error has occurred or a
24. d 40001 Health 40002 RMS Amps A 40003 RMS Amps B 40004 RMS Amps C 40005 RMS Volts A 40006 RMS Volts B 40007 RMS Volts C 40008 RMS Watts Total 40009 RMS VARs T 40010 RMS Watts A 40011 RMS Watts B 40012 RMS Watts C 40013 RMS VARs A 40014 RMS VARs B 40015 RMS VARs C otal 5 Reserved lt lt Use BiLF16 List September 8 2011 7displayed in the Available list in the left Copyright 2011 Bitronics LLC hand pane The present register configuration is shown in the Selected list in the right hand pane Measurement and data items can be added to and removed from the Selected list using the buttons on the page Highlights all measurement data items in Available list Places highlighted measurement data items from Available list into the Selected list Multiple items can be selected at once using the shift or control keys Places a Reserved placeholder item in the Any item that appears in the Selected list Selected list appears gray in the Available list Removes highlighted items from the Selected list The same data item can be used in Shifts highlighted items in the Selected list up by WEE one point position Items added to the Selected list PION i a will be placed above the first Shifts highlighted items in the Selected list down hiehll hted item by one point pos
25. ess 3 0 1 IP Addressing The TCP IP stack needs to be configured with an IP address a SUBNET mask and a ROUTER GATEWAY address It is very important that the network have no duplicate IP addresses Configuration of the address may be accomplished by a web browser or via the front panel menu buttons The units are pre configured with an IP address subnet mask gateway address of 192 168 0 171 255 255 255 0 192 168 0 1 23 ML0037 September 8 2011 Copyright 2011 Bitronics LLC APPENDIX A BITRONICS LEGACY MODBUS REGISTER ASSIGNMENTS BILF12 DEFAULT 12 BIT Note that all registers are available in M650 M651 some don t apply for model B3 registers for M350 A3 or V3 are indicated under the Meter column Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address Health 0 Bit O Non zero Error Data 0 Norm 1 Fail 1 Bit 4 Non zero Error Bit 5 Non zero Error li o Bit 7 Non zero Error Bit 15 Non zero Error AAA cco E G SET Ki dini 24 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address Me ie ee ee ee A A O rf friar e ey ee Volt ee fi 4095 AAA 150 Volt Scale kass V3 Ea E Total Amp si a e 4095 1 2048 3000 Amp Cm Volt Scale W Scale 40009 VARs T
26. hecksum error on phase calibration of inputs 12 Indicates firmware download in progress and measurements are offline 1 9 Heartbeat State Counter 50 Series meters provide a Heartbeat State Counter Register that allows the user to determine the time between successive polls This counter will increment by the number of milliseconds that have elapsed since the last time the data was updated Another use of this register is as a visual indicator that the data is changing it allows users of certain MMs to identify disruption in the polling of the instrument The Heartbeat State Counter is a full 16 bit counter that rolls over at 65535 65 535 seconds The counter starts at zero on power up and is NOT stored in non volatile memory 1 10 Meter ID Register 50 Series meters provide a Meter Type ID register for model identification purposes 40055 for 50 Series default register set which returns a value of 600 BiLF12 Modbus BiLF DNP 601 BiLF16 Modbus or 602 TUC DNP Modbus 1 11 Custom Register Lists From the Protocol Configuration page there are four Modbus register set choices in the Register Set dropdown box BiLF16 BiLF12 TUC1 and TUC2 The BiLF12 and BILF16 Bitronics Legacy Fixed register set definitions can be viewed by clicking on the View Registers button located next to the Register Set dropdown box These standard register sets cannot _ix Edit Registers ML0037 September 8 2011
27. ics LLC 1 2048 3000 Amp Scale Volt Scale VAS Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies Address le ee Eee AO a er NN Ae Pri e Io total A A El CU fl ee ee a A A ees e T A A SAA e AA A AAA A ee SA 8 A A e A AS AA Mr o i A MA G E e Ed O ege fg eg eege H e ec A Ano ee AAA AAA HR 27 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Modbus Address 3 40057 3 40058 40059 Contents 40060 Demand Min Volts B 40061 3 40062 3 40063 3 40064 MN Demand Max VAs Total aye Demand Min VAs Total Demand Min Volts C Demand Watts Total Demand Max Watts Total Demand Min Watts Total Demand VARs Total 3 Demand Max VARs Total 3 Demand Min VARs Total Demand VAs Total ML0037 Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Amp Scale Volt Scale Amp Scale Volt Scale Amp Scale Volt Scale Amp Scale Volt Scale Amp Scale Volt Scale Amp Scale Volt Scale Amp Scale Volt Scale Scale T16 T16 T16 T16 Amp Scale Volt T16 T16 T16 16 T Amp Scale Volt Scale September 8 2011 Values Dependencies 28 Type 1 2048 150 Volt Scale V Na 4095 1 2048 3000 Amp Scale Volt Scale W 4095 1 2048 3000 Amp Scale Volt Scale W a 4095 1 20
28. in non volatile memory and can also be read written through the web interface 1 6 Register Sets and Register Types The 50 Series meters are shipped with a pre defined set of registers and data types These fixed registers do not change The List of Available Measurements may be found in the User Manuals It is possible to create a custom register list from the available measurements The Ethernet port and web browser are required to create the custom register list See section 1 10 for more detail For users who wish to use the 50 Series on systems configured for other Bitronics products a legacy register list may be selected This legacy register list cannot be modified and will cause the M650 M651 to emulate the response of a Bitronics MultiComm or PowerPlex product Note that the M350 has a fixed list that follows the same mapping as that of the M650 M651 only with gaps where the unavailable measurements would be The Bitronics Legacy register list BiLF12 can be found in appendix A There is also a BiLF 16 register set shown in Appendix B that provides better resolution To use the M650 M651 with a Bitronics Analog Output Converter AOC model NAO8101 or NAO8102 it will be necessary to select the legacy registers BiLF12 12 bit 1 7 Primary Units An option exists to choose Primary Units instead of the pre existing scaling mode Optimal Resolution adding the concept of scaling modes to Mx50 The pre existing scaling mode is called
29. ition If no items are highlighted in the Selected list items are added to the end of the list Clears the Selected list for selected DND Type Replaces the entire Selected list with the standard BiLF points list A Class O Enable can be entered to programmatically configure Class O for all items in the list 18 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 2 0 MODBUS PROTOCOL 2 1 Introduction The MODBUS protocol is an open standard which defines a command response method of communicating digital information between a master and slave device The electrical connection between devices is known as a bus In MODBUS two types of devices attach to the bus master and slave devices A master device issues commands to slaves A slave device such as a 50 Series meter issues responses to master commands that are addressed to them Each bus must contain exactly one master and may contain as many slaves as the electrical standards permit All devices on a bus must operate according to the same electrical standards i e all must be RS 232C or all must be RS 485 RS 232C standards specify that only two devices may be connected to a bus i e only one slave is allowed RS 485 specifications allow up to 32 devices 31 slaves on a bus The MODBUS protocol specifications define two types of transmission modes ASCII and RTU This manual describes only the more common RTU mode For more information the m
30. le Volt Scale Scale VAs 40128 Max Average VAs C T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAs 40129 Average Watts A Amp Scale Volt A 32768 32767 1 32768 1500 Amp Scale Volt Scale a Scale 40130 EISES Watts B Ed Scale Volt 32768 32767 1 32768 1500 Amp Scale Volt Scale N Scale Pe 40131 EI Average Watts C Amp Scale Volt Pg 2 32768 32767 1 32768 1500 Amp Scale Volt Scale a Scale 40132 Average VARs A Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 3 40133 Average VARs A T5 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 3 40134 Average VARs A T5 Amp Scale Volt Data 32768 32767 1 32768 1500 Amp Scale Volt Scale Scale VARs 3 40135 Average VAs A T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAs 3 40136 Average VAs B T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale VAs 40137 Average VAs C T6 Amp Scale Volt Data 32767 1 32768 1500 Amp Scale Volt Scale Scale i 40138 BE Average Watts A BS Scale Volt 3 32768 32767 1 32768 1500 Amp Scale Volt Scale N Scale 40139 Ki Min Average Watts B PS Scale Volt eee i 32768 32767 1 32768 1500 Amp Scale Volt Scale A Scale KA 40140 Average Watts C ER Scale
31. ls for hardware details The Modbus network is a MASTER to SLAVE network that is to say one node asks a question and a second node answers A NODE is a Modbus device PLC Computer M650 etc that is connected to the network Each SLAVE NODE has an ADDRESS in the range of 1 to 247 it is this address that allows a MASTER to selectively request data from any other device Address 0 is a BROADCAST ADDRESS that can be used with certain MODBUS functions to allow the MASTER to address all SLAVE NODES at one time The 50 Series meters do not respond to BROADCAST messages The Modbus implementation in the 50 Series conforms to all standard Modbus specifications and capabilities such as maximum nodes distance signal sensitivity etc The 50 Series meters are classified as SLAVE DEVICES in the Modbus structure The data items that are available from the instrument can be obtained via the Modbus Network by issuing a READ HOLDING REGISTERS command from the requesting node 1 2 Modbus Address The serial port in the 50 Series meters can be set up to be RS 232 or RS 485 and support baud rates up to 115200 Configuring the Serial Ports can be accomplished by using the display buttons or via a standard web browser while setting the address is done via a web browser only 1 3 Transaction Timing The instrument completes a set of calculations approximately every 100ms The HOST CPU processor services the Modbus port by interrupts received from the co
32. nd VARs Total Demand Max VARs Total Demand Min VARs Total Demand VAs Total 8 Demand Max VAs Total 40070 Min VAs Total Scale Volt 32768 32767 1 32768 4500 Amp Scale Volt Scale W ML0037 Amp Scale Scale Amp Scale Scale Amp Scale R Scale Amp Scale Scale Amp Scale Scale Amp Scale Scale Amp Scale Scale Amp Scale Scale September 8 2011 Volt Volt Volt Data 32767 1 32768 VAS Volt 32768 32767 1 32768 eyes 32767 1 32768 1 32768 vars Data 32768 32767 1 32768 vars Volt Volt Data 32768 32767 1 32768 vars Data 32767 1 32768 VAS Volt Data 32767 1 32768 VAs 36 4500 Amp Scale Volt Scale W 4500 Amp Scale Volt Scale W 4500 Amp Scale Volt Scale 4500 Amp Scale Volt Scale 4500 Amp Scale Volt Scale 4500 Amp Scale Volt Scale 4500 Amp Scale Volt Scale 4500 Amp Scale Volt Scale Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address A rd deci i A A Cl too as a C E ft 4d E a JAP TES4L FASES ls Cc taste ee beleet lel O e E E E TI DO eee TT e EE i i ss Aa A A la ii rr el e free i ri A lr RRE TES 37 ML0037 September 8 2011 Copyright 2011
33. nics LLC 40030 40031 032 40 Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Modbus Contents Values Dependencies Address ai 40036 pe Geometric 7 Scale al 32767 1 32768 4500 Amp Scale Volt Scale Scale VAS A A gt A eee AA der i dd aa eco js APA E Elsa CCC o CEEE 3 6 16 40043 3 6 16 40044 Be Scale Factor Divisor LEC EPA 1000 Multiply by 10 valid values are 1 10 100 1000 M350 V3 Demand Amps A 1 32768 10 Amp Scale M350 A3 1 frre um A A ASA s A A i ca ie eeng A o ee A ll ee ee e A O EE NO eege ee e de E T ed 35 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Modbus Address Contents Bitronics Legacy Modbus Register Assignments BiLF16 16 Bit Values Dependencies 40055 Demand Volts 0 Scale Co e 32767 1 32768 150 Volt Scale V M350 V3 32767 1 32768 150 Volt Scale V M350 V3 40057 6 Max Volts 8 ER Scale 32767 1 32768 150 Volt Scale V M350 V3 32767 1 32768 150 Volt Scale V M350 V3 40059 Min Volts A Scale ER i 32767 1 32768 150 Volt Scale V M350 V3 40060 Rasa Min Volts B a Scale e H Hl 32767 1 32768 150 Volt Scale V M350 V3 Mis Min Volts C ER Scale e 000 A 32767 1 32768 150 Volt Scale V M350 V3 Demand Watts Total Demand Max Watts Total Demand Min Watts Total t Dema
34. ory Products repaired at the factory are likewise warranted for eighteen 18 months from the date the repaired product is shipped or for the remainder of the product s original warranty whichever is greater Obligation under this warranty is limited to repairing or replacing at our designated facility any part or parts that our examination shows to be defective Warranties only apply to products subject to normal use and service There are no warranties obligations liabilities for consequential damages or other liabilities on the part of Bitronics LLC except this warranty covering the repair of defective materials The warranties of merchantability and fitness for a particular purpose are expressly excluded For assistance contact Bitronics LLC at Telephone 610 997 5100 Fax 610 997 5450 Email bitronics novatechweb com Website www novatechweb com bitronics Shipping 261 Brodhead Road Bethlehem PA 18017 8698 USA ML0037 September 8 2011 Copyright 2011 Bitronics LLC COPYRIGHT NOTICE This manual is copyrighted and all rights are reserved The distribution and sale of this manual is intended for the use of the original purchaser or his agents This document may not in whole or part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without prior consent of Bitronics LLC except for use by the original purchaser The product described by this manual contains hardware
35. otal T16 Amp Scale Volt Data 4095 1 2048 3000 Amp Scale Volt Scale Scale vars 40010 Watts A T15 Amp Scale Volt Data 4095 1 2048 1000 Amp Scale Volt Scale W Scale 3 40011 Watts B T15 Amp Scale Volt Data 4095 1 2048 1000 Amp Scale Volt Scale Scale y saio O of o ni 40013 VARs A T15 Amp Scale Volt Data 4095 1 2048 1000 Amp Scale Volt Scale Scale vars 40014 VARs B T15 Amp Scale Volt Data 4095 1 2048 1000 Amp Scale Volt Scale vars 40015 VARs C T15 Amp Scale Volt Data 4095 1 2048 1000 Amp Scale Volt Scale Scale vars 0 iy 0 LL LL 0 DT 8 40018 ae Residual Scale AS 2047 4095 1 2048 15 Amp Scale A 25 ML0037 September 8 2011 Copyright 2011 Bitronics LLC Bitronics Legacy Modbus Register Assignments BiLF12 Default 12 Bit Modbus Contents Values Dependencies i Step Address E H ee EE e e a E Wf er Kee E re CON EI GE ER a E E PCT TI JF a eg Cid e EPR eee AAA EE I e FI 40032 Unused Pie spare unused register SES 40033 VAS A T15 Amp Scale Volt Data 2047 4095 1 2048 1000 Amp Scale Volt Scale Scale VAs 40034 Amp Scale Volt 1 2048 1000 Amp Scale Volt Scale Scale VAs 40035 T15 Amp Scale Volt 1 2048 1000 Amp Scale Volt Scale Scale VAs 40036 16 VAs Total Geometric T Amp Scale Volt Scale 26 ML0037 September 8 2011 Copyright 2011 Bitron
36. rresponding serial port Incoming messages are parsed and response initiated in approximately 50 ms 1 4 Data Format The 50 Series meters contain a set of holding registers 4XXXX into which the instrument places values that correspond to the measurements the instrument is making These holding registers can be read by any other device on the network using a READ HOLDING REGISTER Function Code 3 When using HOLDING REGISTER DATA the Health Check Register should always be read and checked before interpreting data since some failure modes will cause erroneous data to be presented See Section 1 7 Appendix A provides the Legacy or Bitronics Legacy Fixed BiLF register set for the 12 bit default Appendix B provides the 16 bit BILF version ML0037 September 8 2011 Copyright 2011 Bitronics LLC NOTE Unless otherwise specified all points are READ ONLY ML0037 September 8 2011 Copyright 2011 Bitronics LLC 1 4 1 Modbus Calculation Type Codes The Modbus Type codes for Optimal Resolution that are applicable to the register assignments in the appendix tables are highlighted within the following Calculation Type table Value Bit Mask Description Unsigned 16 Bit Integer kWh KVARh Value aen X 10 000 Value LOW Signed 16 Bit Integer 2 s Complement Saturation 10 Float Value Integer Value 32768 Scale 10 AMPERE al ACT S Inst Fund Demand Max 32768 RATIO Example 5 0 A stored as 16384 when Amp Sc
37. sed by attempting to read beyond the last instrument register r Slave Device Instrument has failed If problem persists please consult customer service Failure 2 6 Supported MODBUS Commands Bitronics instruments support one read and two write commands All commands require a register address to be specified in the command The first register named 40001 is at hexadecimal address 0x0000 The energy demand reset register named 40100 is at hex address 0x0063 In commands and responses the most significant byte of a two byte value is transmitted first All examples that follow use the hexadecimal values and an instrument address of 1 20 ML0037 September 8 2011 Copyright 2011 Bitronics LLC 2 6 1 Read Holding Registers Function Code 03 This function reads from 1 to 125 registers from the Bitronics instrument The command requires a starting register and the number of registers to read Attempting to read non existent registers will cause an exception Modbus read commands are limited to 125 registers maximum per read request and some Modicon PLC Master Blocks MSTR are limited to 100 registers maximum per read request The following example M650 register set shows two registers being read Watts Total register 40008 and VARs Total 40009 COMMAND Function Code 03 Read Holding Registers Byte Name Example severos L Function code E O Watts Total at register 40008 4 Siar adcresstow 7 D006 40001 07 Tee
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