sunyuan
Junior Member level 2
Abstract:This article describes the using of analog output module ISODA remote device control applications. PLC or DCS system, the AO module analog output current or voltage signal directly to control the implementation of the remote device, often because of signal attenuation, distortion caused by long-distance transmission, and sometimes because of signal errors caused by other external signal interference, the entire system does not work properly. ISODA remote analog signal output module use the RS-485 differential digital signal transmission and it can effectively improve the system anti-jamming capability, using RS-485 bus communication and address can be setting, in some cases can also reduce cabling, lower costs and improve equipment control system reliability.
Key words: RemoteAD DA conversion Analog signal output Remote IO
RS-485/RS-232 Data Communication
Introduction:
As the electronics industry, the extent of digitalization of the continuous development, and gradually formed a digital system as the main pattern. A / D and D / A converter as the analog and digital circuit interfaces, are being increasingly widespread attention. With the rapid development of digital technology, people A / D and D / A converters are increasingly high requirements, a new analog / digital and digital / analog conversion between the technology continues to emerge. Through these conversions one can use a variety of controllers for remote monitoring, such as the control of a space temperature, humidity, liquid level and flow control to control the object displacement, velocity and pressure. In the actual work environment, a variety of sensors, PLC, or DCS system, the AO module analog output current or voltage signal is weak (many of mV or mA level), and generally with a lower load capacity. Directly used to monitor the implementation of the remote device, often because of long-distance transmission caused by signal attenuation, distortion, and sometimes because of other external signal interference caused by signals an error, affecting the normal operation of the whole system.
Therefore, to ensure the reliability of monitoring system, we first need the system in a variety of sensors, multi-channel PLC, DCS and other analog signal output isolation, amplification, conversion. Some occasions also need to be remotely through a variety of telecommunications carriers Distortion-free transmission. ISO 4021 (A / D conversion) can be the sensor output analog signals into digital signals with RS232/485 communication signals for remote transmission or use of GPRS, GMS wireless data transmission, and then use the remote analog output module ISO DAO ( D / A converter) to convert digital signals into an analog signal, using analog signals to restore the remote monitoring and control. Of these technologies in SCADA data collection, FCS remote monitoring to get more and more applications.
Key words: RemoteAD DA conversion Analog signal output Remote IO
RS-485/RS-232 Data Communication
Introduction:
As the electronics industry, the extent of digitalization of the continuous development, and gradually formed a digital system as the main pattern. A / D and D / A converter as the analog and digital circuit interfaces, are being increasingly widespread attention. With the rapid development of digital technology, people A / D and D / A converters are increasingly high requirements, a new analog / digital and digital / analog conversion between the technology continues to emerge. Through these conversions one can use a variety of controllers for remote monitoring, such as the control of a space temperature, humidity, liquid level and flow control to control the object displacement, velocity and pressure. In the actual work environment, a variety of sensors, PLC, or DCS system, the AO module analog output current or voltage signal is weak (many of mV or mA level), and generally with a lower load capacity. Directly used to monitor the implementation of the remote device, often because of long-distance transmission caused by signal attenuation, distortion, and sometimes because of other external signal interference caused by signals an error, affecting the normal operation of the whole system.
Therefore, to ensure the reliability of monitoring system, we first need the system in a variety of sensors, multi-channel PLC, DCS and other analog signal output isolation, amplification, conversion. Some occasions also need to be remotely through a variety of telecommunications carriers Distortion-free transmission. ISO 4021 (A / D conversion) can be the sensor output analog signals into digital signals with RS232/485 communication signals for remote transmission or use of GPRS, GMS wireless data transmission, and then use the remote analog output module ISO DAO ( D / A converter) to convert digital signals into an analog signal, using analog signals to restore the remote monitoring and control. Of these technologies in SCADA data collection, FCS remote monitoring to get more and more applications.
