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Chapter 6 |

Modbus Interface

Introduction

IMPORTANT:

The

device with public Modbus interface can also be

configured to operate with a MX43 controller from Oldham. Please follow the
procedure given below to enable MX43-compatibility mode on

Set the Modbus ID of

using

dip-switches as shown in Figure
4-10

according

MX43

configuration (for details please see
the user manual of MX43 controller).
The MX43-compatibility menu on

is password protected. To

enter

MX43-compatibility

menu,

remove the front cover of

and press “Enter” key. The access
code is “Enter”, “Up”, “Down”,
“Up”, “Mode”.

Figure 6-1 MX43-compatibilty Menu

Once the correct access code has been entered then the user can select to
enable (1) or disable (0) the MX43-compatibility mode on

using “Up”

or “Down” key then the selection is confirmed by pressing the “Enter” key.

When programming the ModBus ID address on the

electronics

module or on the smart sensor board, use the binary reference chart on the
following page. A “1” represents “ON” on the switch bank, and position 1 of
the switch bank represents the right most binary digit (LSB).

ModBus characteristics for the

are listed below.

Characteristic

Description

Hardware

2-wire mode (not 4-wire)

Baud Rate

9600

Electrical Standard

TIA/EIA-485

Transmission Mode

RTU mode (not ASCII)

Message Coding System

8-bit

Start Bits

Data Bits

8 (LSB sent first)

Parity Bits

Stop Bits

Table 6-1 ModBus Characteristics for the

Gas Monitor

Содержание iTrans 2

Страница 1: ...FIXED POINT SINGLE OR DUAL GAS MONITOR WITH DUAL ANALOG OUTPUTS Installation Operation Wiring Troubleshooting Part Number 77036429 EN Version 01 Release Date June 29 2013...

Страница 2: ...other trademarks and registered trademarks are the property of their respective owners Although every effort is made to ensure accuracy the specifications of this product and the content herein are s...

Страница 3: ...or which they are designated It should be noted however that the LEL sensors WILL respond to other combustible gases and are not gas specific Silicone compound vapors may affect the catalytic combusti...

Страница 4: ...sure change is greater than 10 from the original pressure Do not expose the sensor to corrosive gases such as Hydrogen Sulphide Do not allow condensation to occur inside the sensor CALIBRATION ALERT G...

Страница 5: ...a wide variety of gases including toxic and combustible gases as well as oxygen From research and development through final manufacturing we never forget that human lives depend on what we do Workers...

Страница 6: ...6...

Страница 7: ...siderations 21 Wall Mounting 21 Column Mounting 21 Chapter 4 System Wiring 23 Introduction 23 Wiring Preparation 23 Alarm Relay Wiring J1 J5 and J6 24 Power and Output Wiring J1 25 Sensor Wiring J3 26...

Страница 8: ...lt Codes 64 Function Codes 64 Chapter 9 Warranty 67 Warranty 67 Limitation of Liability 67 Appendix A HART Interface 69 Introduction 69 Hardware Overview 70 Installation 71 System Wiring 71 Operation...

Страница 9: ...9...

Страница 10: ...10...

Страница 11: ...control systems The is available with an optional relay board allowing the unit to directly control external devices such as fans pumps alarm horns or warning lights Two of the relays can be programm...

Страница 12: ...ngle gas HART Combined Catalytic Infrared 350 mA 24 VDC 1 2 A peak two gas 400 mA 24 VDC 1 2 A peak two gas HART Display Dual channel split screen LED display 4 digit 7 segment arrangement per channel...

Страница 13: ...gen Dioxide NO2 0 2 99 9 ppm in 0 1 ppm increments Nitric Oxide NO 0 999 ppm in 1 ppm increments Chlorine Cl2 0 2 99 9 ppm in 0 1 ppm increments Chlorine Dioxide ClO2 0 02 1 00 ppm in 0 01 ppm increme...

Страница 14: ...ous Location Electrical Equipment ISA S12 13 Part I 2000 Performance Requirements Combustible Gas Detectors iTrans 2 with catalytic sensors only CSA Std C22 2 No 30 M1986 Explosion Proof Enclosures fo...

Страница 15: ...erview Main Electronics Unit Housing The body is a cast aluminum housing that contains the electronics of the gas monitor Details of a single gas housing are shown in Figure 2 1 Figure 2 1 Details of...

Страница 16: ...n For Combustibles For test gas concentrations up to and including 50 of full scale the deviation shall not exceed 3 of full scale gas concentration For test gas concentrations above 50 of full scale...

Страница 17: ...keys are the mode increment decrement and enter keys Refer to Figure 2 3 For applications that require non intrusive manipulation two magnetically activated reed switches are used to accomplish progr...

Страница 18: ...tors and jumpers for wiring and configuring the device The electronics module for a main unit is shown in Figure 2 4 The electronics module for a remote unit is shown in Figure 2 5 Wiring details are...

Страница 19: ...19 Figure 2 5 Electronics Board for Remote Sensor...

Страница 20: ...20...

Страница 21: ...nstallation height depends on the density of the gas being monitored Moreover speed and direction of air flow and relative position to potential leaking points should also be considered IMPORTANT The...

Страница 22: ...22 Figure 3 1 Mounting the Gas Monitor on a Wall Figure 3 2 Mounting the Gas Monitor on a Column Using U Bolts...

Страница 23: ...AC power should not be run in the same conduit NOTE All field wiring colors are arbitrary unless provided by ISC Wiring Preparation 1 Collect the appropriate types and lengths of wire For control wir...

Страница 24: ...making any wiring connections Alarm Relay Wiring J1 J5 and J6 To connect the control wires to the three relay terminals on the relay board wire the unit to the connectors shown in Figure 2 4 The low...

Страница 25: ...upply power CH 1 Channel 1 4 20 mA output signal CH 2 Channel 2 4 20 mA output signal GND DC return Figure 4 2 Power and Signal Connector J1 on the NOTE Use supplied green conductor for enclosure grou...

Страница 26: ...ows 24 V Red wire from sensor head 485A Yellow wire from sensor head 485B Black wire from sensor head GND Green wire from sensor head NOTE Shielding from either the controller or remote sensors should...

Страница 27: ...on J3 should be connected to B in the remote sensor enclosure and 485 A on J3 should be connected to A in the remote sensor enclosure NOTE For remote or standalone sensors there are four terminal blo...

Страница 28: ...28 Figure 4 4 Wiring Diagram for a Single On board Sensor...

Страница 29: ...4 5 Wiring Diagram for a Remote Sensor Stand Alone NOTE When the remote sensor is at distances of 200 meters or further and the sensor is not communicating the jumper J1 may need to be moved to termin...

Страница 30: ...f the jumper J1 is on terminals 1 2 move the jumper to terminals 2 3 For digital ModBus signal and power use a minimum of 4 conductors 18 AWG 0 9 mm insulated and shielded cable Shielding from either...

Страница 31: ...31 Figure 4 7 Wiring Remote Sensors Back to...

Страница 32: ...Remote Sensors Digital ModBus RTU Interface Wiring J1 ModBus Interface Wiring Overview To interface the to a digital controller PLC or HMI connect the power and ground to the appropriate terminals me...

Страница 33: ...onics module is an 8 position DIP switch This switch bank is used to set the ModBus Slave Address for the unit The address can be set from 1 to 255 Use the DIP switches to set the binary representatio...

Страница 34: ...r heads used in a ModBus network the address is set in the same manner Once the aluminum sensor head is removed with the sensor board the sensor electronics module is exposed On the back of the sensor...

Страница 35: ...35 Figure 4 12 Location of Address DIP Switch on Sensor Electronics Module Figure 4 13 Setting the ModBus Address for a Stand Alone Sensor...

Страница 36: ...us interface Note that DIP switches are pre set at the factory for all dual sensor units Wiring Conclusion Once wiring is complete place the electronics module back in the housing by pressing the stan...

Страница 37: ...ing Mode If during the warm up period the unit fails a self test the display will show a fault code and the fault relay will be activated Fault codes are located in Chapter 8 Figure 5 1 Sample Fault C...

Страница 38: ...mal Operating Mode the can enter into the program mode in one of two ways Figure 5 3 Sample Low and High Alarm Displays To enter the Program Mode without opening the enclosure pass over the embedded r...

Страница 39: ...sing the magnetic wand Refer to the sections and subsections within this chapter for detailed information When in the Programming Mode either via the magnetic wand or keypad operation the top line of...

Страница 40: ...gnetic wand over the embedded reed switches located under the CH1 and CH2 designations see Figure 5 4 of the faceplate will allow you to scroll through menus and enter the desired function The functio...

Страница 41: ...row of the LED display During this 10 second time out if the magnetic wand is placed over CH2 that function is entered Once a function is entered a new timer will appear Zeroing Zeroing is the first...

Страница 42: ...process Please make sure that you apply Zero Air to the instrument while it is zeroing The will automatically zero before calibration Zeroing is designated with a flashing 0 in the status bit Once zer...

Страница 43: ...he Normal Operating Mode If you initiate the change span option the status bit will start to flash and the span value can now be changed Figure 5 11 Sample Span Gas Concentration Display The current s...

Страница 44: ...gramming options include all of the functions available in the non intrusive mode as well as a few others These items are password protected To enter the programming options press the Mode key The acc...

Страница 45: ...e button to confirm the channel selection Once a channel is selected the gas type for that sensor is displayed on the top row of the LED display for 5 7 second After that the LED display will show the...

Страница 46: ...ew value If the value is not saved before the time out the will go back to the Programming Mode Set High Alarm The high alarm setpoint is designated with an H displayed in the status bit and the curre...

Страница 47: ...start to flash and the range setpoint can be changed by using the and keys When the desired value is reached press the key If the value is not saved before the time out the will go back to the Program...

Страница 48: ...f the month setting is designated with a d in the status bit and current value next to it To change the day press the button during the 10 second countdown If you do not press during the 10 second cou...

Страница 49: ...eroing during the 10 second countdown the will return to the Normal Operating Mode If you initiate zeroing the status bit will start to flash Once zeroing is complete the unit will return to the Norma...

Страница 50: ...responds to the gas the current reading will be displayed on the top line of the LED display To abort calibration at any time press the Mode key NOTE Check and verify span setting before starting a c...

Страница 51: ...is not pressed the new span value will not be saved NOTE Span Gas Concentration for combustibles can be set from 0 to 100 LEL For the sake of resolution we suggest that Span Gas Concentration should...

Страница 52: ...52...

Страница 53: ...ce the correct access code has been entered then the user can select to enable 1 or disable 0 the MX43 compatibility mode on using Up or Down key then the selection is confirmed by pressing the Enter...

Страница 54: ...e accessible on the refer to the next section ModBus Register List ModBus register addresses are provided in Table 6 1 Addr Inst R W Host R W Range Description 40101 R W R W MSB 01 to FF LSB 01 to F7...

Страница 55: ...instrument The least significant byte LSB holds a code which identifies the gas type This can be read by the host MSB Decimal place holder 01 to FF LSB Gas type code 01 to FF 01 CO Carbon Monoxide 02...

Страница 56: ...r in zero fault 0008 Sensor zeroing 0006 40106 W R 0000 to FFFF Status Bits Holds 16 bits of status for various parameters in the instrument A bit value of 1 indicates that the associated fault condit...

Страница 57: ...SB 01 to 0C LSB 01 to 1F RTC Month and Day Holds the month and day to which the real time clock RTC calendar should be set The most significant byte MSB represents the month from 01 to 0C 1 12 The lea...

Страница 58: ...he low alarm display will activate 40125 R R W 0000 to FFFF High Alarm Display Setting Holds the value of the gas reading at which the high alarm display will activate 40126 R R W 0000 to 03E8 Cal Gas...

Страница 59: ...odBus further The most complete resource is www modbus org Termination When putting devices on the ModBus network a terminating resistor may be required for the last device on the network please see w...

Страница 60: ...60...

Страница 61: ...tional tests every 6 months Further Industrial Scientific Oldham recommends prudent testing and or calibration after a gas alarm All calibration service to the sensors should be recorded and accessibl...

Страница 62: ...the alignment pin After the new sensor is in place screw the sensor cap back on to the housing and secure the set screw Once the new sensor is in place and has time to settle out it should be zeroed...

Страница 63: ...SPAN Sensor has failed Electronics module has failed Replace sensor and calibrate Replace electronics module and calibrate Reading drifts by 10 counts over a short time period in a stable temperature...

Страница 64: ...er after calibrating or replacing the sensor 1 FFF Flashing 1 mA SMART sensor error 2 FFF Flashing 1 mA Sensor error U Or Flashing 1mA Sensor under range U Or Flashing 22mA for 5 seconds then settled...

Страница 65: ...centration R r Sensor Span Reserve Check the span reserve 2 2 Date The latest alarm time date 3 3 Month The latest alarm time month 6 6 Date The latest calibration time date 7 7 Month The latest calib...

Страница 66: ...66...

Страница 67: ...mitation of Liability Industrial Scientific Oldham makes no other warranties either expressed or implied including but not limited to the warranties of merchantability or fitness for particular purpos...

Страница 68: ...ith their use capabilities and limitations as set forth in the applicable product literature Buyer acknowledges that it alone has determined the intended purpose and suitability of the goods purchased...

Страница 69: ...rom anywhere in the 4 20mA loop as long as the handheld device is on the modem side of the 250 ohm load parameterization can also be accomplished through HART interface Figure A 1 HART Board channel 2...

Страница 70: ...he electronics module of the gas monitor contains connectors and jumpers for wiring and configuring the device The electronics module for a main unit is shown in the figure The electronics module for...

Страница 71: ...most applications the power is supplied from the controller that is receiving the 4 20mA output In these applications only three wires are required in case of single sensor unit and only four wires a...

Страница 72: ...72 Figure A 4 Wiring Diagram of Single Sensor HART Supported...

Страница 73: ...73 Figure A 5 Wiring Diagram of Dual Sensor HART Supported...

Страница 74: ...ough terminating resistor installed from the factory but others may need additional resistance to be added This is accomplished by adding a resistor in series with the output from HART board preferabl...

Страница 75: ...unit NOTE When not using isolated 4 20mA or HART 4 20mA outputs use the supplied resistors to connect CH 1 and CH 2 to GND If these resistors are not connected and the 4 20mA outputs are not used a P...

Страница 76: ...m up mode which lasts for three minutes During the warm up mode all gas reading related alarms are disabled the current on the HART 4 20mA channel remains fixed at 3mA 16mA for oxygen sensor and the H...

Страница 77: ...corresponding fault mode Figure A 11 Calibration Display HART interface is enabled throughout the zeroing and calibration modes Fault Mode The enters the fault mode whenever it is not able to provide...

Страница 78: ...f the 4 20mA channels is not being used it should be terminated by inserting the specifically provided 250 ohms for HART CH 1 and 100 ohms for isolated CH 2 resistor between the respective channel out...

Страница 79: ...for which is easiest and the quickest way to access all the process variables of The EDD can be either loaded on a PC host simulator or on a handheld unit Figure A 14 shows the EDD loaded using a PC...

Страница 80: ...80 Figure A 15 EDD GUI View Figure A 16 PC to HART Interface Wiring Diagram...

Страница 81: ...ber Parsing Parameter 0 1 Unsigned 16 iTrans HART Board Firmware Version 2 3 Unsigned 16 iTrans Main Unit Firmware Version 4 5 Unsigned 16 Sensor 1 Firmware Version 6 7 Unsigned 16 Sensor 2 Firmware V...

Страница 82: ...alog Output Range Channel 1 12 15 Float IEEE 754 Cal Gas Value Channel 1 16 17 Unsigned 16 Calibration Interval In Days Channel 1 18 21 Float IEEE 754 Low Alarm Threshold Channel 2 22 25 Float IEEE 75...

Страница 83: ...1 ASCII Sensor ID Number Channel 1 7 16 Latin 1 ASCII Sensor Part Number Channel 1 17 32 Latin 1 ASCII Sensor Serial Number Channel 1 33 Unsigned 8 Sensor Type Code Channel 2 34 Unsigned 8 Gas Type C...

Страница 84: ...ds are dispatched with specific number of data bytes which are written to specified parameters after parsing process In case of a single sensor the parameters of disconnected sensor are also included...

Страница 85: ...l 2 30 33 Float IEEE 754 Cal Gas Value Channel 2 34 35 Unsigned 16 Calibration Interval In Days Channel 2 Table A 4 Write Commands Operation Commands Operation commands are similar to write commands w...

Страница 86: ...86...

Страница 87: ...adiene styrene ASCII American Standard Code for Information Interchange bit binary digit bps bits per second C centigrade C2H4 ethylene C2H6O ethanol C3H6 propylene C3H8 propane C4H10 butane C5H12 pen...

Страница 88: ...ydrogen chloride HCN hydrogen cyanide ISC Industrial Scientific Corporation LED light emitting diode LEL lower explosive limit combustible gases LSB least significant bit mA milliampere mm millimeter...

Страница 89: ...programmable logic controller ppm parts per million REST restart RH relative humidity RTC real time clock RTU remote terminal unit SO2 sulfur dioxide SPST single pole single throw TOX toxic V Volts T...

Страница 90: ...90...

Страница 91: ...0x27 039 0x47 071 0x67 103 0x87 135 0xA7 167 0xC7 199 0xE7 231 0x08 008 0x28 040 0x48 072 0x68 104 0x88 136 0xA8 168 0xC8 200 0xE8 232 0x09 009 0x29 041 0x49 073 0x69 105 0x89 137 0xA9 169 0xC9 201 0...

Страница 92: ...ary Dec Binary Dec Binary Dec Binary 0 00000000 64 01000000 128 10000000 192 11000000 1 00000001 65 01000001 129 10000001 193 11000001 2 00000010 66 01000010 130 10000010 194 11000010 3 00000011 67 01...

Страница 93: ...000 96 01100000 160 10100000 224 11100000 33 00100001 97 01100001 161 10100001 225 11100001 34 00100010 98 01100010 162 10100010 226 11100010 35 00100011 99 01100011 163 10100011 227 11100011 36 00100...

Страница 94: ...55 00110111 119 01110111 183 10110111 247 11110111 56 00111000 120 01111000 184 10111000 248 11111000 57 00111001 121 01111001 185 10111001 249 11111001 58 00111010 122 01111010 186 10111010 250 1111...

Страница 95: ...tion B Gas sensor 1 F Gas sensor 2 C 4 20 mA output scale for sensor 1 G 4 20 mA output scale for sensor 2 D Optional on board relays A Sensor 1 E Sensor 2 0 No sensor 1 Explosion Proof On board 1 Exp...

Страница 96: ...n Null CO H2 F Hydrogen Chloride HCl F Hydrogen Chloride HCl K Phosphine PH3 K Phosphine PH3 L Hydrogen H2 L Hydrogen H2 M Methane IR CH4 by Vol M Methane IR CH4 by Vol N Methane IR CH4 by LEL N Metha...

Страница 97: ...0 6 0 2 6 0 2 7 0 1 7 0 1 8 0 20 8 0 20 9 0 200 9 0 200 A 0 5 00 A 0 5 00 B 0 0 50 B 0 0 50 D Optional On Board Relays 0 No Relay Module Modbus 1 With Optional On Board Relays Modbus 2 No Relay Module...

Страница 98: ...98...

Страница 99: ...pm 10 0 ppm PH3 0 1 00 ppm 0 01 ppm 1 0 ppm 0 30 ppm 0 60 ppm CO H2 NULL 0 999 ppm 1 ppm 100 ppm 35 ppm 70 ppm NO 0 999 ppm 1 ppm 25 ppm 25 ppm 50 ppm NH3 0 200 ppm 1 ppm 25 ppm 25 ppm 50 ppm HCl 0 30...

Страница 100: ...100...

Страница 101: ...in Figure F 1 the cross sensitivity of the methane IR sensor does not permit accurate measure of other combustible gases It should be noted however that the methane IR sensor WILL respond to other co...

Страница 102: ...IR Sensor The output of the IR sensor can be disrupted by sudden changes in temperature If there is an excessive change in the ambient temperature gas sample temperature or flow rate then the output...

Страница 103: ...1 80 0 90 JP 4 3 00 1 50 JP 5 3 10 1 55 JP 8 3 20 1 60 Methane 1 00 Methanol 1 35 0 65 n Pentane 2 00 1 00 Propane 1 60 0 80 Styrene 2 40 1 20 Toluene 2 50 1 25 Xylene 2 40 1 20 Example The instrument...

Страница 104: ...104...

Страница 105: ...105...

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