Industry

Project Description:ABB is a global power and automation technology leader in the field, we are committed to providing solutions for the industrial, energy, electricity, transportation and construction industries. Beijing ABB in Liaoning Expressway Tunnel project level control using MODBUS bus module, the system does not work properly after the project is completed. After field tests at 550 meters - 750 meters from the site, the communication is unstable, there will be out of work for some time after the normal stand case; --950 meters distance at 800 meters of the site completely unable to communicate. It can be recognized as the scene environment is more severe impact on the normal communication systems, resulting in an unstable state of the system of communication. Since the project has been the construction, project owners willing to pay the cost of renovation project, the project contractor, the designer and equipment providers are not willing to take, so I hope to get the lowest cost solution.

Project rehabilitation programs:Beijing ABB as the project designer, easy to control the use of YHM3 series MODBUS bus isolator to protect communications repeater stability. Item difficulty is due to the project construction and wiring have been completed, can no longer be constructed and the site in the middle did not design the switchgear and can not provide power, it can not be added to the relay station in the middle, only added to the sides. After the assessment, the company provides the following solutions, 1) for between 550 meters -750 meters from the site, using YHM3 isolation repeaters, added to the slave side, amplifying communication signals, filter out interference, while isolating bus segments play effect; 2) after 800--950 meters for the site, using MODBUS to CAN bus protocol converters, used in pairs, add in station 2 side, the MODBUS protocol into CAN communication at 9.6K rate, bus Cables can communicate 5KM, and while the bus to get the CAN bus unique anti-jamming performance, they are able to ensure the stability of communication in any situation without upgrading cable lines down. Try not to be under the premise wiring modifications and construction of the project after upgrading, at minimal cost and stable operation of the system

system structure