FM131-E-A HollySys Base Module, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technical development, technical consultation, technical transfer in the fields of intelligent technology, information technology, and automation technology, as well as the sales of electrical equipment, automation equipment, electronic products, communication products, and electromechanical products. Industrial automation products: PLC, DCS, sensors, frequency converters, encoders, relays, servo drives, soft starters, touch screens. Brands involved in the products include: Eurotherm, Schneider, Siemens, ABB, SICK, P+F, E+H, Yokogawa, Yamakawa, Mitsubishi, Emerson, Honeywell, FANUC, GE, Eaton Electrical, CT
Basic Steps of System Design FM131-E-A HollySys Base Module
(1) Thoroughly understand and analyze the process conditions and control requirements of the controlled object
a. The controlled object refers to the machinery, electrical equipment, production line, or process being controlled.
b. Control requirements mainly include the basic mode of control, actions to be completed, composition of the automatic work cycle, necessary protection and interlocking, etc. For more complex control systems, the control tasks can be divided into several parts, which simplifies complexity and facilitates programming and debugging.
(2) Determine I/O Devices
Based on the functional requirements of the PLC control system for the controlled object, determine the required user input and output devices. Common input devices include buttons, selector switches, limit switches, sensors, etc., while common output devices include relays, contactors, indicator lights, solenoid valves, etc.
(3) Select the Appropriate PLC Type
Based on the determined user I/O devices, count the number of required input and output signal points, and select the appropriate PLC type, including model selection, capacity selection, I/O module selection, power supply module selection, etc.
Selection Based on Output Load Characteristics
Different loads have corresponding requirements for the output method of the PLC. For example, frequently switched inductive loads should use transistor or thyristor output types, rather than relay output types. However, relay output PLCs have many advantages, such as low conduction voltage drop, isolation effect, relatively low price, strong ability to withstand instantaneous overvoltage and overcurrent, flexible load voltage (AC or DC), and a wide range of voltage levels. Therefore, infrequently switched AC and DC loads can choose relay output PLCs.