The following instructions describe how to configure a 2 wire Radar smart transmitter with HART communicator using an Emerson 475 Field Communicator. The 475 Field Communicator used for this article contained system software version 3.7. In this article, the Emerson 475 Field Communicator will be referred to as the '475 Communicator'.
Datasheet excerpt: Technical data of HM-MT-USB-010031
Product Description |
---|
Interface for commissioning, calibrating, and acquiring data from HART field devices |
White Paper - The misunderstood HART Loop Resistor. E-book - Interactive DevCom2000 tutorial including screen shots. Testimonials - View testimonials from our quality survey. ProComSol Overview Video - View video of ProComSol's capabilities and benefits. DevCom2000 Demo Video - View video of DevCom2000 software demonstration. Explains how to install the HART Tri-Loop Configuration software, and outlines the main steps to configure a HART Tri-Loop. Section 4 Troubleshooting provides troubleshooting suggestions for the most common operating problems. Section 5 Specifications and Reference Data includes specification data for the HART Tri-Loop, ordering. Www.rosemount.com Reference Manual -4530, Rev AA June 2007 Rosemount 5300 Series High Performance Guided Wave Radar. Loop Integrity Check Once a field instrument has been identified and its configuration data confirmed, the analog loop integrity can be checked using the loop test feature, which is supported by many HART-enabled devices. The loop test enables the analog signal from a HART.
Supply | |
---|---|
Input current | 30 mA at 5 V |
Power supply | Powered by USB port , No external power required |
Interface | |
Interface type | USB port |
Output | |
Signal | 0.5 ± 0.1 Vpp trapezoidal wave at 1200/2200 Hz, 24 VDC at 40 mA to device |
Galvanic isolation | |
Output/interface | 1500 V DC |
Directive conformity | |
Electromagnetic compatibility | |
Directive 2014/30/EU | EN 61326-1:2013 |
RoHS | |
Directive 2011/65/EU (RoHS) | EN 50581:2012 |
System requirements | |
Operating system | Windows® 98 , 2000 , 32-bit XP , 32-bit Vista , 32- and 64-bit Windows® 7, and Windows® 10 |
Ambient conditions | |
Operating temperature | -20 .. 50 °C (-4 .. 122 °F) |
Storage temperature | -20 .. 60 °C (-4 .. 140 °F) |
Relative humidity | 0 .. 95 % non-condensing |
Mechanical specifications | |
Degree of protection | IP20 |
Connection | USB (type A) Connector , red and black test clips |
Material | Polycarbonate |
Dimensions | 75 mm x 33 mm x 15 mm |
Cable length | 1.8 m 2-strand wire terminating in 2 test clips , 15.2 cm cable terminating in 1 USB type A connector |
General information | |
Supplementary information | Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.pepperl-fuchs.com. |
Sometimes there's a problem getting a loop powered HART instrument to communicate when it's on the benchtop, but it communicated fine when wired in the field. Why is that? It's probably because when it's on the test bench, the loop doesn' t have enough resistance for the HART signal to be ‘seen' by the HART handheld or HART modem.
In a bench test situation, power is applied to the transmitter, so it fires up and runs fine. But there's no analog input in the loop as there is when the transmitter is wired in the field. What's missing is the dropping resistor on the analog input that supplies the loop resistance needed for the HART signal to develop. Download selenium for mac.
Hart Tri Loop Configuration Software Download
4-20mA loops transmit the signal as electrical current (milliamps), but the receiver device with the analog input ‘reads' the signal as a voltage, whether the signal to be read is analog or HART. The current signal becomes a voltage drop when the current passes through a resistor (Ohms Law).
The HART signal is a 1200 baud signal superimposed on the loop's 4-20mA DC signal. 1200 baud is a relatively high frequency signal compared to the 4-20mA DC current signal.
Hart Tri Loop Configuration Software Windows 10
Some minimum loop impedance is needed so that the HART signal can be ‘seen' or ‘read' by a HART master, like a HART communicator or HART modem. The analog inputs on the receiver device (DCS, PLC, RTU, PAC, controller, recorder, or indicator) have a precision shunt resistor installed at each analog input. It is usually 250 ohms, but not always.
The voltage (IR) drop needed for HART communications is produced by the resistance at the loop receiver's analog input. The loop's wire resistance contributes very little resistance. When a transmitter is powered up with just a DC power supply there isn't enough voltage from the 1200 baud HART signal for the for the HART master (handheld communicator or a HART modem) to ‘see' the signal. The internal resistance of a DC power supply is insufficient to develop a HART voltage drop, and its filter capacitors act as a low pass filter to squelch the relatively high frequency 1200 baud HART signal.
In the absence of a receiver device with its analog input resistance being part of the loop, there is insufficient loop resistance for a HART master device to ‘see' the FSK HART signal and HART communications fails.
Hart Tri Loop Configuration Software Interface
The good news is that a resistor can be inserted into the loop and the HART signal will develop a voltage drop and the HART master can ‘see' the HART signal. Indesign cs4 for mac free download.
The following instructions describe how to configure a 2 wire Radar smart transmitter with HART communicator using an Emerson 475 Field Communicator. The 475 Field Communicator used for this article contained system software version 3.7. In this article, the Emerson 475 Field Communicator will be referred to as the '475 Communicator'.
Datasheet excerpt: Technical data of HM-MT-USB-010031
Product Description |
---|
Interface for commissioning, calibrating, and acquiring data from HART field devices |
White Paper - The misunderstood HART Loop Resistor. E-book - Interactive DevCom2000 tutorial including screen shots. Testimonials - View testimonials from our quality survey. ProComSol Overview Video - View video of ProComSol's capabilities and benefits. DevCom2000 Demo Video - View video of DevCom2000 software demonstration. Explains how to install the HART Tri-Loop Configuration software, and outlines the main steps to configure a HART Tri-Loop. Section 4 Troubleshooting provides troubleshooting suggestions for the most common operating problems. Section 5 Specifications and Reference Data includes specification data for the HART Tri-Loop, ordering. Www.rosemount.com Reference Manual -4530, Rev AA June 2007 Rosemount 5300 Series High Performance Guided Wave Radar. Loop Integrity Check Once a field instrument has been identified and its configuration data confirmed, the analog loop integrity can be checked using the loop test feature, which is supported by many HART-enabled devices. The loop test enables the analog signal from a HART.
Supply | |
---|---|
Input current | 30 mA at 5 V |
Power supply | Powered by USB port , No external power required |
Interface | |
Interface type | USB port |
Output | |
Signal | 0.5 ± 0.1 Vpp trapezoidal wave at 1200/2200 Hz, 24 VDC at 40 mA to device |
Galvanic isolation | |
Output/interface | 1500 V DC |
Directive conformity | |
Electromagnetic compatibility | |
Directive 2014/30/EU | EN 61326-1:2013 |
RoHS | |
Directive 2011/65/EU (RoHS) | EN 50581:2012 |
System requirements | |
Operating system | Windows® 98 , 2000 , 32-bit XP , 32-bit Vista , 32- and 64-bit Windows® 7, and Windows® 10 |
Ambient conditions | |
Operating temperature | -20 .. 50 °C (-4 .. 122 °F) |
Storage temperature | -20 .. 60 °C (-4 .. 140 °F) |
Relative humidity | 0 .. 95 % non-condensing |
Mechanical specifications | |
Degree of protection | IP20 |
Connection | USB (type A) Connector , red and black test clips |
Material | Polycarbonate |
Dimensions | 75 mm x 33 mm x 15 mm |
Cable length | 1.8 m 2-strand wire terminating in 2 test clips , 15.2 cm cable terminating in 1 USB type A connector |
General information | |
Supplementary information | Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.pepperl-fuchs.com. |
Sometimes there's a problem getting a loop powered HART instrument to communicate when it's on the benchtop, but it communicated fine when wired in the field. Why is that? It's probably because when it's on the test bench, the loop doesn' t have enough resistance for the HART signal to be ‘seen' by the HART handheld or HART modem.
In a bench test situation, power is applied to the transmitter, so it fires up and runs fine. But there's no analog input in the loop as there is when the transmitter is wired in the field. What's missing is the dropping resistor on the analog input that supplies the loop resistance needed for the HART signal to develop. Download selenium for mac.
Hart Tri Loop Configuration Software Download
4-20mA loops transmit the signal as electrical current (milliamps), but the receiver device with the analog input ‘reads' the signal as a voltage, whether the signal to be read is analog or HART. The current signal becomes a voltage drop when the current passes through a resistor (Ohms Law).
The HART signal is a 1200 baud signal superimposed on the loop's 4-20mA DC signal. 1200 baud is a relatively high frequency signal compared to the 4-20mA DC current signal.
Hart Tri Loop Configuration Software Windows 10
Some minimum loop impedance is needed so that the HART signal can be ‘seen' or ‘read' by a HART master, like a HART communicator or HART modem. The analog inputs on the receiver device (DCS, PLC, RTU, PAC, controller, recorder, or indicator) have a precision shunt resistor installed at each analog input. It is usually 250 ohms, but not always.
The voltage (IR) drop needed for HART communications is produced by the resistance at the loop receiver's analog input. The loop's wire resistance contributes very little resistance. When a transmitter is powered up with just a DC power supply there isn't enough voltage from the 1200 baud HART signal for the for the HART master (handheld communicator or a HART modem) to ‘see' the signal. The internal resistance of a DC power supply is insufficient to develop a HART voltage drop, and its filter capacitors act as a low pass filter to squelch the relatively high frequency 1200 baud HART signal.
In the absence of a receiver device with its analog input resistance being part of the loop, there is insufficient loop resistance for a HART master device to ‘see' the FSK HART signal and HART communications fails.
Hart Tri Loop Configuration Software Interface
The good news is that a resistor can be inserted into the loop and the HART signal will develop a voltage drop and the HART master can ‘see' the HART signal. Indesign cs4 for mac free download.
Hart Tri Loop Configurator Software
The HART Foundation's website has a technical specification that states that the minimum loop resistance needed is 230 ohms. A 250 ohm resistor is commonly used because 250 ohm resistors work for that purpose and are typically available in the instrument shops where these types of bench tests are done. The resistor need not be a precision resistor.
Connect a 250 ohm resistor with alligator clips, like this one, to a wiring terminal and a loose wire in a loop circuit to test HART communications at the benchtop.
Hart Tri Loop Configuration Software Pdf
HART handheld communicators (275/375/475, Meriam 5150) usually have a pair of banana jacks on the handheld for the purpose of connecting a plug adapter with a 249 or 250 ohm resistor to provide the needed loop resistance. If a HART communicator or HART modem fails to establish communications, it is advisable to insert a 250 ohm resistor in series in the loop (or use the banana plug adapter with a communicator).