System requirements: the tunnel is classified according to its length, which is short tunnel (L < 250m) and central tunnel (250m-3000m). The longer the tunnel is, the more monitoring facilities need to be considered. Tunnel monitoring system according to the various subsystems can be divided into: lighting system, ventilation system, traffic guidance system, CCTV system, fire alarm system, fire control system, emergency telephone system, broadcasting system, etc. According to the type of equipment can be divided into: detection equipment, control equipment, display equipment and communication equipment. Detection equipment such as: fire alarm probe, vehicle detector, COVI, visibility detector, wind speed wind direction, etc. Control equipment such as traffic area controller, lighting area controller, ventilation area controller, etc. Display equipment such as: computer workstation, large screen monitor, sound alarm, etc. Communication equipment such as switch, hub, serial port signal transmission equipment, optical terminals, etc. 

Solution: APAX - 5570 XPC PC based controller, with Celeron M CPU APAX - 5520 KW Micro PAC, with XScale CPU APAX - 5013-8 channels RTD module, APAX - 5017-12 analog input module, APAX - 5028-8 channel analog output module, APAX - 5040-24 digital quantity input module APAX - 5060-12 channel relay output module.

system description: the regional controller PLC is responsible for the field detection equipment information collection, processing to the local control center, while local control center control commands sent to regional controller, and then directly controlled by the regional controller corresponding equipment. In the absence of communication between local control center and regional controller, the regional controller still has the ability to independently control the field equipment. Therefore, the regional controller should be efficient and highly reliable. As a tunnel monitoring area controller, the CPU itself supports industrial Ethernet bus and a variety of fieldbus, economical and convenient. Using the remote control with intelligent distributed structure of the CPU, system, openness and compatibility strong, rich I/O and high performance functional modules, fully meet the requirements of tunnel monitoring system for signal processing. The feature is small volume, each module adopts the way of the side connection, the function is relatively complete, the program capacity is large enough, the module is easy to unload, convenient site maintenance.

Conclusion: APAX - 5520KW CPU can be focused on the I/O control processor. Since there is no other task to disrupt the CPU work of the APX-5520KW, its control capabilities can be most efficient and support for real-time running. APAX - 5520KW provides the standard IEC - 61131-3 development tool, Multiprog software and stable ProConOS, enabling engineers to develop applications and applications in the short term, greatly saving time. The CPU of APAX - 5570XPE / 5571XPE controller can perform other tasks, such as HMI/SACDA, program, database, data record, and communication with other systems. Since the APAX - 5520KW can continuously perform tasks, after HMI software embed XP Embeded system into APAX - 5570XPE / 5571XPE, it can still ensure the stable operation of the system.