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Application of PLC 200 in Free Port Communication
2020-03-06
Description: Control two plastic molding machines. Transfer data from the two machines to the host computer. The host PC uses the MSCOMM control to enable data exchange between the two PLCs, forming a small control system.
1. Customer Requirements:
The host PC can monitor data on the PLC200 at any time and perform all parameter settings on the host PC without affecting the operator's normal operation during production.
2. On-site Analysis:
Because many parameters need to be modified and product changes are frequent, the host PC uses the MSCOMM control for parameter settings, adopting a switch mode between manual operation and remote setting. Parameters such as machine pressure and temperature are set remotely on the host PC. This method does not affect production. Free port communication is used.
3. Solution:
1. Plan:
Use a small control system with PLC200 for the plastic molding machines, selecting CPU 226 and configuring corresponding modules. Use Smartline 1000 for real-time on-site operation. Communication between PLCs uses free ports, and communication between the host PC and PLC200 is implemented using the MSCOMM control written in VB language.
2. Problems encountered in the plan:
① Unable to set parameters on PLC200 from the PC;
② Data acquisition from PLC200 fluctuates significantly;
③ Temperature fluctuations during machine production are large and inconsistent with the site;
④ Machine shaking during production is obvious and affects product quality.
3. Analysis and solutions to the problems encountered:
① There was a minor program issue; the MSCOMM control program was modified and corresponding address settings were made.
② Due to harsh site conditions, the original thermistor and thermocouple wires were replaced.
③ After inspection, it was confirmed that the cooling system of the old machine was faulty.
④ After optimizing the PLC200 program, it was found that during the design of the hydraulic machine, the hydraulic control must be gradually controlled during pressurization.
4. Summary:
For small control systems that require frequent parameter changes and diversified production, advanced languages can be used to set parameters in PLC200.
06 Mar,2020
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