In practical applications, when engineers make a system selection, whether to choose the S7-200 system or the S7-300 system for this system, the most important thing depends on the maximum IO capacity that the system needs to carry. At present, the maximum IO capacity of the S7-200 PLC system is 128 DI/128 DO, 32 AI/32 AO. If the number of points required for system control of digital or analog quantities exceeds the range specified by the system, the S7-200 system cannot meet the control requirements. Will switch to S7-300 system to meet application requirements.
In recent years, the industrial control industry has developed rapidly. For many mechanical equipment, such as large plastic extruders, sewage treatment control, and automobile assembly lines, the number of IO control points has exceeded the ability of the S7-200 system. More users can only choose S7 -300 system, as we in the industry know, the price difference between using 300 system and 200 system is very large, ranging from several thousand to tens of thousands, which greatly increases equipment manufacturing costs and reduces market competitiveness. Based on the above-mentioned needs, after years of technical accumulation, Aoyuexin Technology has launched a solution based on the S7-200 system's ultra-strong expansion capability, an independent product-the IM265A rack expansion module, in order to better serve and market. Use the S7-200 mainframe to expand 6 modules and the seventh slot is connected to the IM265 and then 7 expansion modules, which greatly expands the 200 system IO capacity. Moreover, it is easy to use and convenient to program, which greatly satisfies customer applications.
The IM265A rack expansion module diagram is as follows:
1. Easily expand the capacity of 200 systems, 7 IO modules can be expanded, and up to 14 modules can be expanded after a single CPU;
2. Input bidirectional photoelectric isolation, support 80CM bus extension line, reliable and easy to install;
3. IM265A module body comes with 16DI/16DO, which is very cost-effective
System application examples:
The control objects of a sewage treatment project in Wuxi, Jiangsu include water inlet well, lifting pump room, fine grid room, secondary sedimentation tank, aeration grit tank, blower room, biochemical reaction tank, ultraviolet disinfection cabinet, outlet channel, etc., each key control All areas need to detect parameters such as liquid level, temperature, and PH value.
The overall block diagram of the electrical control system of the industrial sewage treatment system shown in the figure above, combined with control requirements and technology, this control system is a combination of on-site control and remote control. The site consists of 200 mainframes + OYES expansion modules + IM265 + OYES 200 series modules Perform data collection, check liquid level, temperature, PH value, etc., as shown in the figure below:
IM265 module usage method and matters needing attention:
1. IM265A provides bus power for subsequent expansion modules, no need to consider bus power consumption
2. IM265A needs to occupy the IO slot and must be placed in the 7th module after the CPU, otherwise IM265 will not be recognized
3. The total number of modules is greater than 7, the analog modules should be placed behind the CPU as much as possible, and only digital modules should be placed after the IM265A.
4. When using, the power supply on the lower left side of IM265A must be connected, otherwise the module will not be recognized
5. For the specific parameters of the IM265A module, please refer to the Aoyuexin module user manual.
in conclusion:Based on the solution of S7-200 system's super expansion ability, replacing part of S7-300 system with S7-200 system + IM265 module, which not only provides technical convenience for production, but also saves costs, and improves the competitiveness of enterprises. For manufacturers, it is a cost-effective automation control system solution.
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