Abstract: In order to ensure fast and efficient rail transportation system operation, the current rail system to signal the power system reliability requirements are high, the railway transport system in the signal s power system monitoring, real-time monitoring becomes even more important, the project aims to provide the PLC solution enables customer requirements have been
1 Introduction
Power control is an important railway signal control system. Prior to the signal power monitoring system is basically used as a signal acquisition system microcontroller core. Microcomputer control system on the one hand there is slow acquisition speed, friendly interface, convenient operation and other technical limitations, on the other hand the power module as part of which monitor the relative independence of the power system has brought a lot of inconvenience, such as maintenance problems, the interface shows red tape and so on. For the above reasons supporting the development of this project based on Delta PLC as the core of the signal acquisition, Delta HMI touch screen interface as the operation and monitor the power monitoring system. Monitoring subsystem and power supply module interconnected through industrial bus networks to integrate economic and practical, technologically advanced power monitoring system of railway signals.
2 hardware and software system design
2.1 Hardware System Design
Figure 1 hardware system design
Railway signal power hardware system design see Figure 1. System size: 44 digital inputs; a digital output; 6 power module; 39 analog input.
Control system configuration is as follows: Touch screen: DOPA75CSTD; PLC: DVP16EH00T +1 a DVP04AD-H +3 months DVP16HM11N; power module communication card 1; time-acquisition circuit card 1.
Touch screen is to display the collected data, alarm, alarm setting upper and lower limits, collecting data fine-tuning, alarm data, historical trend graph display. PLC is mainly collected data and calculated, taking into consideration the system of the analog acquisition speed requirement is not very high, in order to save costs, the system uses a one DVP04AD-H to the 39 analog for the time-collection, in order to achieve this function joint experiment with the manufacturers we have developed an electronic switch circuit 39 of the 10 analog sub-groups, each 4-way, the output of different groups were collected. Power communication card is mainly responsible for the six power modules of data collection and through the RS484 interface to PLC communications with MODBUS protocol, to get six Power PLC acquisition data module for the realization of this function the power of our company have done a lot of the work of R & D the end, the PLC communication cards and power modules to achieve the communication, the power module has been collecting information.
2.2 Software System Design
(1) The function of system: 44 digital acquisition and display and fault diagnosis; 6 power module data acquisition display to show the working status of the power module and determine the police; 39 analog display, and determine the lower limit alarm; alarm screen, alarm information, the current alarm, alarm frequency; alarm set upper and lower limits; data fine-tuning capabilities, and show that fine-tuning value;
Historical trends show; different picture to open permissions;
Described above is the data necessary to fine-tune function, as a measuring device measuring the field will be errors, but this error is fixed, short period of time is constant, so this part of the program were to increase functionality, so that the final show out numerical value after the elimination of errors;
(2) system architecture design is divided into HMI and PLC man-machine conversation interface part of the monitoring part of the site. HMI part of the main structure see Figure 2.
Figure 2 HMI human-machine conversation interface
PLC control section includes: power module communication; timeshare acquisition of 40 analog, 4-way for each acquisition; on the analog scale were calculated according to the value displayed to show the working status of the power module and determine alarm; fine-tuning value calculation shows that the value of fine-tuning, and do to eliminate negative; failure and alarm; digital acquisition and display and fault diagnosis;
3 Project commissioning
Debug time-capture feature to note time-acquisition time, had much effect on the overall data collection time, data collection is too small will cause confusion and require an additional increase in the period between the two data collection intervals, to avoid two sets of data overlap. On the analog scale were calculated according to the value displayed. Fine-tune the value, display value of fine-tuning, and do eliminate negative; attention to fine-tuning may be a negative situation, so to eliminate negative considered. Note that the power supply module communication protocol when communication must be set up in the communications card, including the station number set, Also note that the corresponding address. Fault and alarm; for a total of 79 alarm points, it is cumbersome, requires clear thinking.
4 Conclusion
Dentsu Inc. based in up to offer solutions of typical cases Fang An integration of two different Zhonglei of products, reflecting a single technology platform in the works in the Yiti Hua Ji Cheng characteristics.