On fully enclosed rail transit lines, viaducts or tunnels are usually used to avoid the impact of rail lines on the distance, while on non-fully enclosed rail transit lines, the plane intersection between the railway and the distance, that is, level crossings, is more common.
In the early stage, the bottom of the rail transit level crossing is to rely on personnel on duty to regulate traffic and avoid accidents. With the progress of technology, the bottom of level crossings in Europe and the United States has been upgraded to automated unattended crossings, and most of the level crossings in China have now completed automated operations.
How to ensure the safety of these unattended level crossings?
An important safety function in the use of level crossings
The following safety functions are particularly important in the application of level crossings, which need to be monitored safely to ensure the safety of level crossings:
●Monitoring the operation of the railing machine
●Signal monitoring of the pole in place
●There is no conflict in the monitoring crossing
●Detect axle counters or rail circuits to monitor locomotive orientation information
●Through the vision system to monitor the situation information of the car at the crossing
● Signal light system monitoring: whether the signal lights of the railway and the distance are faulty or not, the demand is safely detected
●Level crossing condition data can be recorded and transmitted for preventive maintenance, and remote diagnosis can be carried out through the network
The safety monitoring of railway work is not brief
Due to the characteristics of its work and the high requirements for safety, railways also have severe requirements for safety monitoring equipment, and need to meet a series of safety specifications. In Europe, the EN 501** series of specifications is an important reference for the safety design of rail transit systems.
PSS 4000-R: Made for railway work
The PSS4000-R safety system is a safety controller specially developed by Pilz for railway work, which meets the requirements of the EN 501** series of specifications, and has undergone rigorous type tests and tests organized by TÜV SÜD, and has obtained the relevant certification of European railways, and can easily and simply meet the requirements of SIL4 in 50126/50128/50129.
Programming software for PSS4000-R safety systems – PAS4000 supply of IEC 61131-3 compliant PLC programming languages, such as ladder diagram languages, which can easily and quickly complete the control logic programming of level crossings. The safety analogue monitoring module of the PSS 4000-R safety system, in combination with the current sharing module, can complete the current monitoring of the signal lamp, complete the preventive maintenance of the signal lamp and fault diagnosis. The PSS4000-R system supplies a data power-down storage area, and the data in this area can be stored for a long time even in the event of a system power failure. In addition, the CPU module of the PSS4000-R system integrates an Ethernet interface, which can be connected to the safe remote I/O site for distributed control based on the safe real-time Ethernet protocol - SafetyNET p, and the CPU module also supports convenient remote diagnosis in the form of OPC server.
In addition, the PSS4000-R system can accept the operating ambient temperature range of -40 °C - +70 °C, even at an altitude of 5000 meters above sea level, it can operate normally, covering almost all level crossings trackside applications.
It is trustworthy because of its professionalism
The PSS4000-R system has been widely used in level crossings in many places around the world, and has won the love of many users. For example Switzerland RGS now uses the PSS4000-R system at more than 200 level crossings for safety control. In addition, the PSS4000-R system also has excellent performance and rich experience in other application scenarios of rail transit work with its certified advantages and excellent product quality, such as the safety control of signal interlocking, on-board safety control of locomotives, safety control of vehicle maintenance workshops, and safety control of turnouts.
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