Abstract: AC500 Series PLC control system and the three-tier distributed based on its automatic control system of sewage treatment. Gives the system structure, function, main characteristics, and discusses the system in SBR sewage treatment.
Keywords: PLC; control system; sewage treatment
I. Introduction ABB, acquisition of Bailey (Bailey) company, it s the variety of control systems integration to IT-based industrial, targeted technology 800XA Series control system. Continue for domestic electricity, metallurgy, petrochemical, and paper industry as a whole solution, incorporated it s a more than ten years of the historical development of small and medium control system AC31 as the product into China. On this basis, the current introduced into the AC500 series is more, for domestic applications such as system integration and OEM to offer more choices. This article describes the system and its application in wastewater treatment.
2, AC500 control system introduced
AC500 system consists of CPU, communication modules, CPU backplane, I / O modules and terminal board, FBP interface module and terminal board, CPU and base composition, shown in Figure 1.
CPU
CPU with PM571, PM581 and PM591 three different levels. All with: LCD display, buttons, a SD card expansion port and two integrated serial communications port. CPU can be directly inserted in the CPU backplane, backplane optional integrated Ethernet or ARCNET network interface. In addition, the communication interface CS31 reservations are taken into account and AC31 other series such as ABB, PLC compatibility.
Communication module in addition to CPU, integrated communication interfaces, each on a CPU can be expanded up to four communications interfaces. The four communication interfaces can be extended to any of the standard bus protocol. CPU on the integration of the two Modbus communication interface and optional integrated Ethernet or ARCNET network interfaces, expansion interfaces can extend through the communication : ProfibusDP-V1, DeviceNet, CANopen and Ethernet bus interface.
I / O module input / output module has two analog and switch type. Each input / output modules can plug directly into the terminal board, CPU FBP distributed through the expansion of local and sub-stations can be extended to seven the maximum input / output module. AC500 is also available to every user s needs and can be set to the input switch can set the output volume of the module.
FBP the interface module This module integrates a number of digital input / output, and through its implementation and CPU of communication and distribution of I / O. The distribution end of the module but also the largest expansion of seven input / output module.
AC500 Control Builder programming AC500 Control Builder programming is the set of all series AC500 CPU programming of engineering tools, this programming software meet the international standard IEC61131-3 can support five different programming languages :
- Function block (FBD)
- Statement List (IL)
- Ladder Diagram (LD)
- Structured text (ST)
- Sequence Control Chart (SFC)
The software can complete the AC500 system, all settings, including all of the bus interface, but also a comprehensive self-diagnostic functions, alarm processing, visualization, debugging tools and open data interface. In addition, can also provide off-line simulation, variable tracking, recipe management and monitoring list, visual debugging tools, communication interface settings, open data interface, project interfaces.