The sea for the application of PLC in temperature control system

Introduction: as the product category refrigeration industry manufacturers more and more in the face of overseas customers, the customer requires the product in the process of refrigeration process parameters is mainly the temperature parameters of record and report, thus upgrading to the original control system. In order to minimize the investment, use on the basis of the original temperature controller with a sea of RS485 communication module and domestic for programmable controller ( Haiwell PLC) Can be very economy is convenient to implement these requirements. Now, we give a brief introduction to the system application. Solution: as shown in the above, the system mainly include the temperature controller, programmable controller with RS485 interface, computer, printer, kingview configuration software, etc. Working principle: using Haiwell communication function of PLC is easy to use, use Haiwell PLC RS485 mouth and 16 thermostat communication, collect all the temperature of cold storage, then through RS232 port Haiwell PLC controller and computer communication, on the computer using configuration software to collect and record the temperature. System advantages: 1, using the PLC Haiwell Modbus communication instruction MODR and MODW implementation and Fuji temperature reading of the thermostat and temperature setting. All Haiwell PLC controller communication function are an instruction implementation are available, and don't need to special, special register programming, also need not more than management communication instruction sequence, under the same conditions can write multiple communication instruction at the same time. 2, Haiwell PLC built-in standard Modbus protocol, can easily communicate with kingview software; 3, using the original thermostat with a communication module, significantly save clients' cost and save time; revamping workload, 4, 1 Haiwell PLC standard RS232 and RS485 1 mouth, and any a communication port as a host also can be used as from the station. Any a communication port as a programming port, also can be used as a communication port with a third party equipment. In this application, use the RS232 port and the computer communication, communication with RS485 and Fuji thermostat. The main hardware configuration: 1, programmable controller: HW - S32ZS220R 1 2, the thermostat: PXR4 ( 富士) 16 sets 3, configuration software: 1 set of 4 256 kingview, computer and printer: 1 sets of three, programming window: 1, the use of MODR and MODW the realization of the instruction is very easy to communicate with Fuji thermostat; 2, using Haiwell PLC built-in real-time clock TIME and switch TIME instructions, an instruction that is to realize the daily timing defrost function; Iv. Conclusion: use of the sea for programmable controller ( Haiwell PLC) Convenient communication function and convenient instruction set, the realization of the economic efficient refrigeration process collect and record the process parameters, meet the requirements of customers international. Can be widely used in refrigeration industry, the old system and new system technology upgrades.
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