3 Instruments and Meters: 【One Question per Week】Discussion Question for Week 7 of 2011 (Prizes for Participation)
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This post was last edited by Baghdad on 2011-2-21 14:42. Instruments: [Weekly Question] Question for the sixth week of 2011: Why are DC signal systems commonly used in industrial automation instruments? : ~. e7 ]; c1 B Note: 1 c6 f; % R8 m9 ]: J- e! \) k: S+ t 1) Respondents can receive up to 20 wealth rewards, and only responses that involve in-depth discussion will earn extra points! In principle, not more than 120 ； - {' m3 t5 N6 k% n; l5 P( ~2 x5 M 2）Thank you all for your active participation. 3) Please hide your replies; the method for doing this is at http://bbs.hcbbs.com/thread-492556-1-1.html. (No rewards will be given for any replies that are not hidden. ）
This post was last edited by siena2008 on 2011-7-12 10:42
This post was last edited by denghl on 2012-11-26 22:41. 1 DC is not affected by AC. 2. DC is not affected by the inductance and capacitance of the transmission lines. 3. It facilitates digital-to-analog conversion, data processing, and connection to a computer. 4. It is easy to obtain a reference voltage.
This post was last edited by denghl on 2012-11-26 at 22:19. The input/output signals of industrial automation instruments are mostly DC signals, and their advantages include: 1. It is easy to obtain a reference voltage for DC signals, such as the setpoint of a regulator. 2. During the signal transmission process of the instrument, DC signals are not affected by AC induction, which makes it easier to address the issue of interference resistance in the instrument. 3. DC signals are convenient for analog-to-digital and digital-to-analog conversion, thereby enabling instruments to be easily connected to data processing devices, computers, etc. 4. DC signals are not affected by the inductance and capacitance of the transmission lines, and there is no issue with phase shift, thus simplifying wiring.
This post was last edited by denghl on 2012-11-26 at 22:37. The input/output signals of industrial automation instruments are mostly DC signals, which have the following advantages: 1. During the signal transmission process in the instrument, DC signals are not affected by alternating current induction, making it easier to address the issue of interference resistance in such instruments. 2. DC signals are not affected by the inductance and capacitance of the transmission lines, and there is no issue with phase shift, thus simplifying wiring. 3. DC signals are convenient for analog-to-digital and digital-to-analog conversion, thereby enabling instruments to be easily connected to data processing devices, computers, etc. 4. It is easy to obtain a reference voltage for DC signals, such as the setpoint of a regulator.
This post was last edited by denghl on 2012-11-26 at 22:37. OP, I searched for this question before, and the answer I found was as follows; I’m not sure if it’s correct: 1. DC signals are less prone to interference issues. 3. DC signals are convenient for analog-to-digital and digital-to-analog conversion, as well as for establishing communication connections. 4. The wiring for DC signals is simple; it can be 2-wire or 3-wire.
This post was last edited by denghl on 2012-11-26 22:37. Reply 1# Baghdad: resistant to interference and high in stability. Easy to convert
The last edit to this post was made by denghl on 2012-11-26 at 22:37. Output signals are often in the form of DC signals, and their advantages include: 1. In the process of signal transmission in industrial automation instruments, DC signals are not affected by alternating current induction, which makes it easier to address the issue of interference resistance in these instruments. 2. DC signals are not affected by the inductance and capacitance of the transmission lines, and there is no issue with phase shift; therefore, the wiring is simple. 3. DC signals are easy to convert between analog and digital forms, which enables instruments to be easily connected to data processing devices, computers, etc. 4. It is easy to obtain a reference voltage for DC signals, such as the setpoint of a regulator.
This post was last edited by denghl on 2012-11-26 at 22:40. I really hadn’t considered that, but I think it might be because the signal transmitted by the instrument is a relatively weak one!
This post was last edited by denghl on 2012-11-26 at 22:40. 1. During signal transmission, DC signals are not affected by interference, which helps to reduce noise. 2. DC signals facilitate A\D and D\A conversions. 3. DC signals are not influenced by inductors or capacitors.