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Arkon MAGB2 User Manual Download Page 24

MAGB2 User Guide

23

V1.7 2021-10-01

11. MODBUS

This manual describes the MAGB2 Modbus-RTU communication protocol.

11.1. General Modbus RTU

Definitions and Abbreviations

CRC

Cyclic Redundancy Check, Used for error-checking in Modbus
RTU. See appendix

Modbus master

A Modbus device, which is able to access data in one or more
connected Modbus slaves

Modbus slave

A Modbus device, which is able to respond to requests from a
single Modbus master

Modbus address

Throughout this document the following notation is used to
address Modbus RTU registers:

1234 - Holding register 1234 (addressed in messages by 1233)

USB

Refers to the USB Specification usb.org

RTU

Remote Terminal Unit - Standard Modbus transmission mode

References

Reference 1

Modbus over Serial Line Specification & Implementation guide
v. 1.0 modbus.org 12/02/02

Reference 2

Modbus Application Protocol Specification v. 1.1 modbus.org
12/06/02

Technical data

ARKON Flowmeter Modbus RTU specification

Device type

Slave

Baud rates

4800, 9600, 19200, 38400 bits/sec.

Number of stations Recommended:

max. 31 per segment without repeaters

Device address range

1-247

Protocol

Modbus RTU (Other Modbus protocols like ASCII, Plus or
TCP/IP are not supported)

Electrical interface

USB

Supported function code

3 read holding registers
16 write multiple registers

Broadcast

No

Maximum cable length

USB Specification limits, RS485 up to 500mts

The communication module complies with the Modbus serial line protocol [Reference 1].

Among  other  things,  this  implies  a  master-slave  protocol  at  level  2  of  the  OSI  model.  One  node,  (the
master), issues explicit commands to one of the „slave“-nodes and processes responses. Slave nodes will
not  transmit  data  without  a  request  from  the  master  node,  and  do  not  communicate  with  other  slaves.
Modbus is a mono master system, which means that only one master can be connected at any single point
in  time.  Two  modes  of  communication  are  possible,  Unicast  and  Broadcast.  Unicast  mode  is  where  the
master sends a request to one slave device, and waits a specified time for a response. In Broadcast mode
the master sends out a request to address „0“, which means that the information is for all slave devices on
the network. In Broadcast mode there is no response from the slave devices.

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Summary of Contents for MAGB2

Page 1: ......

Page 2: ...ternal measurements 17 8 1 External temperature sensor 17 8 2 External pressure sensor 18 9 External modules 19 9 1 RS485 Module 19 9 2 3G GPRS GSM Module 20 9 3 4 20mA module 21 10 Menu 22 11 MODBUS 23 11 1 General Modbus RTU 23 11 2 Commissioning 24 11 3 Modbus holding registers 25 11 4 Password 26 11 5 Real time measurement Integer 27 11 6 Real time measurement Float 28 11 7 Info 29 11 8 Displa...

Page 3: ...AGB2 User Guide 2 V1 7 2021 10 01 18 How to order your MAGB2 50 19 MAGB2 Error Code Table 51 20 Firmware version compatibility 52 21 Appendix 53 21 1 CE and Conformity 53 21 2 Warranty 53 21 3 Contact 53 ...

Page 4: ...located in a 90 degree angle from the magnetic field and the flow direction 1 2 Applications Water waste water Chemical industry Food industry Power engineering Agriculture Effluent Industry 1 3 Safety Instructions Please read this manual carefully before using the product Keep this manual for future reference Arkon Flow Systems s r o will not be liable for any damage caused by improper use of the...

Page 5: ...meter conduct a visual check of the flowmeter upon receipt to make sure the product has not been damaged during transport Check the completeness of the package In case of any problem contact the Arkon sales department without delay o Flowmeter o Cables o Pendrive Manual o Mounting kit Key ...

Page 6: ...otected by a junction box which is potted to IP68 The cable entry on the transmitter side is through a M20x1 5 gland The cable type used for the connection between sensor and transmitter for remote versions UNITRONIC Li2YCY PiMF 2x2x0 34 The MAGB2 can be used with a maximum 6 mts of cable between sensor and transmitter in remote version 2 2 Sensor installation Sensor dimensions can be found on cha...

Page 7: ...to earth is 1 ohm Sensor grounding with earthing rings 2 3 Dry liner Flowmeters with a Hard Rubber liner can show incorrect readings during the first 2 3 days after installation This is due to the fact that the time needed for transport and the time before installation is long enough for the liner to dry out and thus it changes shape size This change in effect affects reading accuracy Simply be ke...

Page 8: ... the signal cable from the sensor to the transmitter circuit board Set up the transmitter for use You are now ready to start using your flowmeter or to customize its settings as per your requirements For example Set up the measurement unit of flow rate displayed e g m3 hr Set up of the unit for the volume displayed For all volume counters this same unit will be used Electrical installation should ...

Page 9: ... the connections of the cables between sensor and transmitter 2 5 1 Compact version Note keep the unshielded part of electrode cable as short as possible 2 5 2 Remote version Recommended cable Li2YCY 2 x 2 x 0 34 PiMF Note keep the unshielded part of electrode cable as short as possible ...

Page 10: ...MAGB2 User Guide 9 V1 7 2021 10 01 2 6 Connections overview ...

Page 11: ...e flow Total Volume This counter is only credited when the measured medium is flowing in the chosen positive direction In case the flow is 0 or if it is flowing in the opposite negative direction the number on the counter remains the same Total Volume This counter works the same way as the positive volume counter yet in the opposite direction In case the flow is 0 or flowing in the designated posi...

Page 12: ...40 we recommend that the existing batteries are replaced with new batteries Symbol Function Enter Escape Back Down Up Left Right D Flow simulation mode Selection menu Measurement Stop If the display indicates this symbol the totalizers are not incremental Measurement Running Flow meter run totalizers are incremental Fast Excitation function This icon indicates a maximum frequency of excitation 6 2...

Page 13: ...MAGB2 User Guide 12 V1 7 2021 10 01 GPRS module connected Excitation failed 4 20mA module connected ...

Page 14: ...flowmeter functions Settings negatively affecting battery life USB communication RS485 communication Display and or backlight still on Frequency or relay set to Volume pulse GPRS communication 4 20mA output External measurements inputs Fast excitation mode 4 3 Changing the battery If the battery indicator indicates low battery capacity remove the battery by the following steps Un plug the old batt...

Page 15: ...signal Then the frequency is proportional to the flow The battery current consumption is higher if you choose this option 2 PULSE VOLUME this setting works the same way as relay output volume pulse the output generates a pulse when the preset volume has passed the sensor the pulse width can be set The battery current consumption is higher if you choose this option Minimal resolution is 1ml 6 Relay...

Page 16: ...arator Flow Flow 1 Flow 2 Hysteresis 1 and Hysteresis 2 9 ON Flow1 output ON if the actual flow is the bigger than the value set as Flow 1 and hysteresis can be set under Comparator Flow Flow 1 Hysteresis 1 10 ON Flow1 output ON if the actual flow is smaller than the value set as Flow 1 and hysteresis can be set under Comparator Flow Flow 1 Hysteresis 1 11 VOLUME PULSE the output generates a pulse...

Page 17: ... the computer as a virtual COM port Therefore is possible to use Arkon communication software or use your own SCADA software The communication protocol is Modbus RTU over serial port Note USB connection is also used by datalogger download Maximum data size is 64B about 14 MODBUS addresses at once USB connect is battery consumable BASIC CIRCUIT CONNECTIONS VIRTUAL COM PORT VCP DRIVERS Drivers works...

Page 18: ...special low power smart temperature sensor is used Specification Range 20 130 C Ambient temperature 20 130 C Power supply 3 3VDC Output type Impulse Accuracy 0 5 C Process connection M20x1 5 male Ingress protection IP67 Cable legth 1 meter Excitation frequency 1 5 1 5 1 15 1 30 MAGB2 connection Mechanical connection The preload is 20Nm The installation torque is 34 Nm The maximum installation torq...

Page 19: ...mbient temperature 40 125 C Power supply 3 3VDC Output type Digital Accuracy 0 5 FS Process connection M20x1 5 male Ingress protection IP67 Excitation frequency 1 5 1 5 1 15 1 30 MAGB2 connection Mechanical connection The preload is 20Nm The installation torque is 34 Nm The maximum installation torque shall not exceed 70 Nm Sealing O ring D17x2 5 NBR70 ...

Page 20: ...sion without external power on request Baud rate Max 19200 baud s Isolation 3750Vrms BASIC CIRCUIT CONNECTIONS Multi Node Network with End Termination Using module RS485 Terminator Rt with resistance 100 should be connect to the end of line RS 485 Module Name Symbol Ordering Code MAGB2 RS485 Module 485 Warning electrostatic sensitive device Any connection or disconnection of any module has to be d...

Page 21: ...T CONNECTIONS Using the 3G GPRS GSM Module For more information about installation and specification see document MAGB2 GPRS GSM User Guide The meter is sending flow and totalizer information in selected time interval to maximum 3 phone numbers in form of SMS message and or GPRS TCP packet to selected IP address and port The settings of the SMS and data transfers are done using special GPRS menu i...

Page 22: ...rial Process Control Electrical Specifications Mode Passive VCC 8 30VDC Max load 30 1000Ohms depends on power supply Temp range 20 70 C Isolation 2500Vrms BASIC CIRCUIT CONNECTIONS Using the 4 20mA Module Module Name Symbol Ordering Code MAGB2 4 20mA 4 20mA Warning electrostatic sensitive device ...

Page 23: ...registers software and internal flowmeter menu All functions are described in MODBUS section under each menu item Menu overview is below Main menu Real time measurements MODBUS only Info Display User settings External measurements Service settings Factory settings GPRS settings Authorize ...

Page 24: ... of stations Recommended max 31 per segment without repeaters Device address range 1 247 Protocol Modbus RTU Other Modbus protocols like ASCII Plus or TCP IP are not supported Electrical interface USB Supported function code 3 read holding registers 16 write multiple registers Broadcast No Maximum cable length USB Specification limits RS485 up to 500mts The communication module complies with the M...

Page 25: ...d Modbus data register blocks Holding registers I e the module will not support the other standard data register blocks Coils Discrete input Input registers Modbus function codes This device supports following function codes 3 16 and 17 Function code 3 and 16 are used for accessing registers Function code 17 report slave ID will return a structure of identification information of the device Below ...

Page 26: ...s Exception 2 Illegal data address Application errors include writing to ReadOnly holding registers Holes register alignment If start address is not the start of a mapped holding register Exception 2 Illegal data address Writing to holes is not allowed Exception 2 Illegal data address If the end address is only part of a mapped holding register item e g one half of a longint value the action depen...

Page 27: ...bus registers It is necessary to write both Low and High Word of this item the register number always has to be an even number Not meeting these requirements will cause an Exception 2 error Illegal data address Full range 1 18 10 38 to 3 4 1038 It is always needed to read 4 bytes 2 words 11 4 Password To enter the User settings and Factory settings sections it is necessary to enter a password Modb...

Page 28: ...Longint 0 0 2 16 ERROR CODE R 122 121 Longint 0 0 2 32 Ext Temperature R 124 123 Longint 0 0 2 32 Ext Pressure R FLOW Unit m3 h it is not possible to change it Real value Actual value 1000 TOTAL TOTAL TOTAL AUX DEC and DIG Unit m3 it is not possible to change it The final number is given by the sum of the whole and the decimal Example Resulting Total measurement TOTAL DIG TOTAL DEC 10 3 ERROR CODE...

Page 29: ...ature R 164 163 Float Ext Pressure R 166 165 Float ADC RAW data R 168 167 Float EP RAW data R FLOW Unit m3 h it is not possible to change it TOTAL TOTAL TOTAL AUX Unit m3 it is not possible to change it ERROR CODE Convert read value to binary number Number one means error For more information see chapter 19 Ext Temperature If external measurements module temperature is used Ext Pressure If externa...

Page 30: ...0 0x20100325 Time time is stored in BCD format HHMMSS ie 08 33 15 0x00083315 Unit no exclusive number for this Flowmeter If there are any problems please refer to this number Error code Convert read value to binary number Number one means error For more information see chapter 19 Diameter this item shows the nominal sensor diameter that is currently configured for the given flowmeter Flow Qn nomin...

Page 31: ...nable Time s R W so far only ENG implemented other languages will come in future updates Unit Flow actual flow unit default m3 h Unit Volume totalizer unit default m3 Unit Temperature applies for external temperature sensor default C Unit Pressure applies external pressure sensor default bar Language Language of transmitter menu so far English only Contrast Set display s contrast Backlight sets th...

Page 32: ...gnal 0 OFF 1 Frequency Output 2 Pulse volume R W 2010 2009 Longint 3 0 36 000 000 1000 Frequency Output Q1kHz R W 2012 2011 Longint 3 0 36 000 000 10000 Volume per Pulse m3 R W 2014 2013 Longint 1 0 36 000 000 50 Pulse Width ms R W 2016 2015 Longint 3 0 36 000 000 1000 Relay Comparator Flow 1 m3 hr R W 2018 2017 Longint 3 0 36 000 000 1000 Relay Comparator Flow 2 m3 hr R W 2020 2019 Longint 3 0 36...

Page 33: ...empty pipe check Default ON If the Air detector is active and the pipe is empty the unit automatically turns down the excitation to prolong battery life Delete Aux Volume write value different to zero for erasing the auxiliary flow totalizer Samples per Avg the number of samples that the flowmeter will use for calculation of its displayed average flow value Default 3 Frequency Output Setting Signa...

Page 34: ...odbus device address Default 1 Modbus Baudrate setup communication speed Default 19200 Modbus Parity setup communication parameters Default none 1 stopbit Totalizer Cycling If set each 3 seconds the secondary display Main screen changes its value Module select selects the used external module ...

Page 35: ...2517 Longint External pressure A zero R W 2520 2519 Longint External pressure A span R W 2522 2521 Longint External pressure error enable R W 2524 2523 Longint External pressure upper range for error R W 2526 2525 Longint External pressure lower range for error R W External temperature measurement state Switches on off the external temperature module External temperature offset user offset calibra...

Page 36: ...1 0 Measuremen t 0 Stop 1 Running R W 3020 3019 Longint 0 9999999 9 99999999 450000 0 Air Constant R W 3022 3021 Bool 0 0 1 0 Invert Flow 0 No invert 1 Invert R W 3024 3023 Longint 0 0 5 3 Low Flow Cutoff 0 OFF 1 0 5 2 1 3 2 4 5 5 10 R W 3026 3025 Longint 3 0 36 000 000 Flow Qn R W 3028 3027 Longint 0 0 0x2999123 1 Date Settings R W 3030 3029 Longint 0 0 0x0023595 9 Time Settings R W 3032 3031 Lon...

Page 37: ... Default 188 Invert Flow this function serves to change the direction of the flow Default OFF Low Flow Cutoff this function serves to set the minimum flow the flowmeter will react on Default 2 Flow Qn setup to the excepted flow Qn It is set automatically when you write diameter Date Settings date write in BCD format YYYYMMDD ie 25 03 2010 hex 0x20100325 Time Settings time write in BCD format HHMMS...

Page 38: ...4011 Longint 7 0 1000000 0 Zero Flow Constant R W 4014 4013 Longint 3 0 36 000 000 Calibration positive Point 1 R W 4016 4015 Longint 0 8388608 8388607 Calibration positive Data 1 R W 4018 4017 Longint 3 0 36 000 000 Calibration positive Point 2 R W 4020 4019 Longint 0 8388608 8388607 Calibration positive Data 2 R W 4022 4021 Longint 3 0 36 000 000 Calibration negative Point 1 R W 4024 4023 Longin...

Page 39: ... meter starts to measure zero constant Note real flow in the tube needs to be 0 Zero Flow Constant after activation this function next 125 samples are compute to average value for zero flow constant Calibration positive Point 1 Calibration positive Data 1 Calibration positive Point 2 Calibration positive Data 2 Calibration negative Point 1 Calibration negative Data 1 Calibration negative Point 2 C...

Page 40: ...Longint 0 0 999 UV R W 5030 5029 Bool 0 1 Send GPRS message R W 5032 5031 Bool 0 1 Send SMS R W subject to development of the string mode of MODBUS So far to be set via keyboard Interval sets interval between messages Start hour sets at which hour the interval starts Automatic sending if set to on the meter sends messages automatically to server phone based on interval and start hour Server IP set...

Page 41: ... for testing purposes For more information please see MAGB2 GPRS module manual 11 14 Authorize Modbus register Modbus address Data type No of decimal Min Value Max Value Description Read Write 6000 5999 Longint 0 0 9 9999999 User Password Setup R W Password Setup Set password user ...

Page 42: ... 2218 FW_CHECKSUM 0x283FD871 hex YYYY MM DD HH MM TOTAL m3 h TOTAL m3 h TOTAL m3 h AUX m3 h ERROR h BATTERY mAh TEMP degC PRESS Bar 2020 01 05 16 12 12 3842 12 3977 0 0000 12 3349 0003 100 000 0 0 0 000 2020 01 05 16 12 12 3842 12 3977 0 0000 12 3349 0003 100 000 0 0 0 000 13 Internal backup 13 1 Automatic saving data After each parameter change that one is saved to EEPROM Every minute the date ti...

Page 43: ...ftware Can be downloaded from http www arkon co uk support or obtained on delivered pen drive Run the Setup exe in the Flowmeters folder To uninstall Flowmeters SW in Settings Start menu under Add remove programs you select Flowmeters and then click the uninstall button Start by selecting MAGB2 in the top menu of the Flowmeters SW In case you want to use USB connection connect MAGB2 to USB before ...

Page 44: ...es on one RS485 line Fill in the communication parameters and proceed to the SERVICE section Service This section serves for overall remote configuration of the flowmeter You enter this section by clicking Service in the above window You can be connected simultaneously to several units in one instance of SW Flowmeters ...

Page 45: ... tab is the menu tab which will display the item selected in the menu tree on the left hand side of the main window Some items are only accessible after entering the correct password When asked for a password simply enter the correct password for the given section User and Factory password and click OK TIME The next tab is Time Here you can enter the correct current time ...

Page 46: ...Tabs REAL TIME MEASUREMENT The 4th tab is Real time measurement and it serves to view actual current flow The current flow is shown as the first item on top of this window but it is also depicted in the form of a graph at the bottom This graph shows current flow data for the last 100 seconds of measurement On right side are actual errors in red color ...

Page 47: ...or older FW version In order to do so navigate in the menu into Factory settings FW update Yes MAGB2 will reboot in FW update mode then you can use new FW together with its uploading SW Please contact support for more information There is a full procedure for FW update P_40_MAGB2_Firmware Update ...

Page 48: ...e flowmeter is to be used for what materials are acceptable for the process media Arkon can only recommend materials we cannot guarantee them Please note that Arkon offer also WRAS approved material for all standard sizes For more info contact our sales department Liner Selection Hard Rubber Drinking water and wastewater 0 70 C Soft Rubber Water with abrasive particles 0 70 C PTFE Chemicals and fo...

Page 49: ...MAGB2 User Guide 48 V1 7 2021 10 01 17 Flowmeter Dimensions Compact version Remote version ...

Page 50: ...6 500 DN ØD ØD1 CxØd H_compact H_remote L 1 2 88 9 60 5 4x15 7 258 161 200 3 4 98 6 69 9 4x15 7 266 169 200 1 108 79 2 4x15 7 271 174 200 1 1 4 117 3 88 9 4x15 7 282 185 200 1 1 2 127 98 6 4x15 7 290 193 200 2 152 4 120 7 4x19 1 309 212 200 2 1 2 177 8 139 7 4x19 1 332 235 200 3 190 5 152 4 4x19 1 349 252 200 4 228 6 190 5 8x19 1 378 281 250 5 254 215 9 8x22 4 409 312 250 6 279 4 241 3 8x22 4 441 ...

Page 51: ...le P Remote PANEL mounting kit incl 6m cable R Remote DIN Rail mounting kit incl 6m cable Connection type D DIN A ANSI Size 20 3 4 150 6 20 mm 150 mm 6 25 1 200 8 25 mm 1 200 mm 8 32 1 1 4 250 10 32 mm 1 1 4 250 mm 10 40 1 1 2 300 12 40 mm 1 1 2 300 mm 12 50 2 350 14 50 mm 2 350 mm 14 65 2 1 2 400 16 65 mm 2 1 2 400 mm 16 80 3 450 18 80 mm 3 450 mm 18 100 4 500 20 100 mm 4 500 mm 20 125 5 600 24 1...

Page 52: ... FW Checksum fail will be added in future updates Errors on the display are indicated in hex format This number must be converted to binary format You can use a calculator with hex converting function Once the error code has been converted to binary format each position is related to a different error see the table above Number 1 indicates error and number 0 indicates no error Example Error shown ...

Page 53: ...ffers the option of updating the firmware version using USB connection FW MB Comments RS485 GPRS Datalogger 22 14 V3 3 Initial version no no Not readable 22 15 V3 4 no yes Not readable 22 16 V3 4 Final menu structure no yes Not readable 22 17 V3 4 Datalogger RS485 yes yes As a pen drive 22 18 22 20 V3 5 Various stability changes yes yes As a pen drive ...

Page 54: ...e Arkon Flow Systems s r o Return Regulations and Warranty Conditions are an integral part of the Resellers contract and of any Order Confirmation Please see your Resellers contract or www arkon co uk Support section The Warranty sheet is part of the Packing note of any new goods sent For the claim or return procedure please consult our web site www arkon co uk or call the Arkon Flow Systems s r o...

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