SM480 HollySys Input Module Controller, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technology development, technical consultation, technology 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. The hardware system is a distributed, open process control hardware system designed and developed by HollySys based on fieldbus technology.
SM480 HollySys Input Module Controller, the architecture of the SM series hardware system is shown in Figure 1, mainly consisting of an engineering station, operator station, main control cage, I/O cage, terminal modules, and communication networks.
The intelligent I/O units of the M series hardware system are composed of I/O modules placed inside the main control cage and expansion cages, along with corresponding terminal modules. The I/O modules and corresponding terminal modules are connected via pre-made cables (DB25) to complete the collection, processing, and driving of field data,
achieving the digitization of field data. Each I/O unit establishes communication with the main control unit via the ProfiBus-DP fieldbus. Both the main control module and I/O modules support hot-swapping functionality. The communication network system network (SNET) is a real-time communication network connecting nodes such as the engineering station/operator station and the main control unit, used for bidirectional data transmission between the engineering station/operator
station and the main control unit. It adopts an industrial Ethernet redundant configuration, enabling the rapid construction of a high-speed redundant secure network with star, ring, or bus topology
structures, compliant with IEEE802.3 and IEEE802.3u standards, based on the IP communication protocol, with a communication rate
of 10/100Mbps adaptive, and transmission media using Category 5 non-twisted pair cables with RJ45 connectors.
The I/O response time of a PLC includes input circuit delay, output circuit delay, and time delay caused by the scanning operation mode (generally within 2 to 3 scan cycles). For systems controlled by switching signals, the PLC and I/O response time generally meet the requirements of practical engineering, and the I/O response issue may not need to be considered. However, for systems controlled by analog signals, especially closed-loop systems, this issue must be considered. Selection is based on the characteristics of the output load.