Traffic is the blood of a country, is the foundation of the national economy and leading industry, a country's economy developed or not largely depends on the country's transportation development. China's hilly area accounts for about 69% of the whole. Because of the fund shortage, the skyway construction is given priority in mountainous or hilly area, This highway cost is low, not only go miles long, takes up more arable land, and there is a high energy consumption, danger, lots of adverse factors. Such as ecological environment destruction and frequent traffic accidents, cause huge economic losses, and a large number of casualties.

Tunnel construction can improve the level of highway rate, it is a way of resource saving and environmentally friendly. Also is the one of the important measures to solve high speed, fast and safe transportation. Tunnel plays a great role in the development of modern highway transportation. With the rapid development of economy and highway traffic construction scale expanding, the new survey and design idea gradually mature, the construction technology progress, highway tunnel construction ofChinais rapidly developing. Due to the special environment of the tunnel, the safety of the tunnel and the stability of the tunnel management is the most important appraisal index tunnel operating conditions, therefore tunnel ventilation, lighting, traffic control and monitoring system requirements is very high, industrial communication products performance, network performance is very important to the safe and smooth operation of the whole system. By using modern control theory and advanced monitoring equipment, set up a complete set of tunnel monitoring system, regulate the flow of traffic, control of tunnel ventilation and lighting, prevent accident fire arrangement for improving the safety of the tunnel driving, rapidity and comfort is particularly important. With the rapid development of economy and highway traffic construction scale expanding, the new survey and design idea gradually mature, the construction technology progress, highway tunnel construction ofChinais rapidly developing. Due to the special environment of the tunnel, the safety of the tunnel and the stability of the tunnel management is the most important appraisal index tunnel operating conditions, therefore tunnel ventilation, lighting, traffic control and monitoring system requirements is very high, industrial communication products performance, network performance is very important to the safe and smooth operation of the whole system. By using modern control theory and advanced monitoring equipment, set up a complete set of tunnel monitoring system, regulate the flow of traffic, control of tunnel ventilation and lighting, prevent accident fire arrangement for improving the safety of the tunnel driving, rapidity and comfort is particularly important.

System introduced:

PLC system formed by Ci-PF12 build a PROFIBUS-DP fiber redundant ring network in the left hole and the right of the tunnel hole, between tunnel control station and control center are set the Ethernet communication. CK6062 build a optical self-healing ring network, two optical fiber ring network are completely independent control system, non-interference each other. Control center engineer and tunnel control station via the Ethernet module of Ethernet communication to operate the PLC data exchange. Tunnel each instrument, for example, 4-20 mA current signal of sensor output (AI/AO), switch signals (DI/DO) through the CJ - MF series of multi-channel analog switch optical multiplexer and collect data are uploaded to the left and right of the tunnel holes sub control station PLC, then access to the system. Using optical fiber as transmission medium mixed with electric cable, it effectively solved the problems of the distance and interference.

Realize functions:

Collect information of this segment detection equipment, including CO detector, visibility detector, transmittance detector, vehicle detector, etc. To collect information preprocessing, then stored in local storage unit. The local controller of tunnel processed information (CO concentration, visibility, smoke concentration, transmittance, vehicle detection, traffic signals and signs, etc.) and stored to the sub control center of tunnel monitoring server. Receiving station tunnel computer various control commands (such as control of fan start and stop, lighting switch on/off, etc.), after compare control commands, and sending commands (such as fan, lighting, lane control signs, traffic lights, horizontal hole instructions) to the next equipments.

Network Structure:

(Figure 1)

Product Functions introduced:

Cj - mf series products are a multichannel multiplexing equipment, it composed analog, digital and serial RS232/485/422 fiber transformation. Adopted the latest ARM chips, it featured stable and reliable low-power, and support 1 ~ 4 channel digital/switch signals, 1~4 channel analog (voltage/current), 1~2 channels of RS232/485 or a RS422 signal in the optical fiber of alone or mix reuse transparent transmission, without change user's communication protocol, solving the electromagnetic interference, ground loop interference and lightning damage problem, greatly improving the control signal reliability, security and confidentiality, also solving the problem that the traditional way of short transmission distance. IP30 protection grade, strengthen the chassis, ,35mm DIN rail mounting installation, industrial standard DC24V power supply, power supply polarity reverse connect protection function.

Conclusion:

The system adopts the CJ-MF61 analog/switch series fiber optic converters, Ci-PF12 PROFIBUS fiber optic repeater, CK6026 industrial Ethernet switches for optical fiber transmission, solve the fieldbus electromagnetic interference, ground loop interference and lightning damage problem, greatly improving the control signal reliability, security and confidentiality, and solving the problem of the short transmission distance. Shenzhen - remember technology co., LTD is a professional industrial communications network solutions provider, it is the trust partner who provide complete industrial fiber optic communications solutions.