IOP302 Metso Module METSO Controller, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technical development, technical consultation, technology transfer, and sales of electrical equipment, automation equipment, electronic products, communication products, and electromechanical products in the fields of intelligent technology, information technology, and automation technology. Industrial automation products include: PLC, DCS, sensors, frequency converters, encoders, relays, servo drives, soft starters, and touch screens. Product brands involved include: Eurotherm, Schneider, Siemens, ABB, SICK, P+F, E+H, Yokogawa, Yamakawa, Mitsubishi, Emerson, Honeywell, FANUC, GE, Eaton Electrical, CT.
IOP302 Metso Module METSO Controller, before making a decision on the system control solution, it is necessary to understand the control requirements of the controlled object in detail to determine whether to use PLC for control.
In cases where the control system logic is complex (requiring a large number of intermediate relays, time relays, counters, etc.), process flows and product modifications are frequent, data processing and information management are required (such as data operations, analog control, PID regulation, etc.), the system requires high reliability and stability, or factory automation networking is planned, using PLC control is essential.
First, determine the total number of I/O points of the control system, then reserve 15–20% of the actual required total points as a backup (to allow for system modifications) before determining the required number of PLC points.
Additionally, note that some high-density input modules have limitations on the number of simultaneously activated input points; generally, the number of simultaneously activated input points should not exceed 60% of the total input points. The driving capacity (A/point) of each PLC output point is also limited, and for some PLCs, the output current per point varies with the applied load voltage. Generally, the allowable output current of a PLC decreases as the ambient temperature increases. These issues should be considered during selection.
PLC output points can be categorized into common-point, grouped, and isolated connection methods. Isolated output points can use different voltage types and levels, but the average cost per point for such PLCs is higher. If output signals do not require isolation, the first two output methods should be selected.