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TS107HL-F-2.5 Datasheet(PDF) 3 Page - MORNSUN Science& Technology Ltd. |
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TS107HL-F-2.5 Datasheet(HTML) 3 Page - MORNSUN Science& Technology Ltd. |
3 / 5 page Signal conditioning module TxxxxHL-F Series 2014.05.21-A/0 Page 3 of 5 MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation Fig. 2 field area HART communication application Description Fig.2 shows a typical application of the Signal conditioning module TxxxxHL-F. MCU system, HART modem IC AD5700 and the signal conditioning module TxxxxHL-F work together for the communication between smart field devices and control systems . The transmission of analog signal As Fig.2, the signal conditioning module taking energy from the output current Loop to supply its internal dissipation, at the same time , it could provide one isolated power Vo +, for the MCU system and the other smart field devices . The Analog signal comes from sensor, after the AMP module, it is received by the MCU system, when the signal is output from the MCU system, it should be a voltage signal that match with the Signal conditioning module TxxxxHL-F at the range of voltage, at last, the voltage signal is converted to standard 4 ~ 20mA signal within the two-wire current loop. HART send the signal conditioning module TxxxxHL-F didn't provides a single channel for HART signal transmitting from field area to control systems, but a common channel with analog signal. With a few external components, the signal which come from MCU, is modulated and added into the analog signal, and they will be send to control systems together. The peak voltage of HART signal must be consider before communication, the peak voltage of the Hart Signal that output by AD5700 is too high to match the range of TxxxxHL(500mV typically, see the datasheet of AD5700 for details ), two external capacities of 22nF and 47nF is recommended to drop Voltage. HART detect Working with a external 10μF capacity, TxxxxHL-F can detect HART signal which is contained in the two-wire loop-circuit by the HART_IN PIN(PIN 3). After the condition of TxxxxHL-F, HART signa has been Transmitted to field area, at last, HART signal is demodulated by IC AD5700, for the reading of MCU. By the way, HART signal could not be demodulated by IC AD5700 if its amplitude is lower then the value of specification(100mV typically, see the datasheet of AD5700 for details ). In this condition, the peak voltage of HART signal which is send by control system should be upgraded. Application without HART The hole system which shown in Fig.2 , provides a solution for the Transmitting of the sensor signal to the 4 ~ 20mA standard current signal and the HART communicating between smart field devices and control systems, what's more, all the connections between field area and control area are only two analog wires, therefore, lowe cost for systems is possible. In the control systems, a resistor RL should be concluded for the detecting of common instruments. If the function of HART communicating is not necessary, please remove the HART modem IC A5700 in the system, and do not connect the HART_IN PIN and HART_OUT PIN of TxxxxHL-F into any circuits. Fig. 3 Power capacity expansion program of field area |
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