SIMATIC S7-300 PLC S7-300 is a modular Small PLC, which can be used in applications with medium performance requirements. Various individual modules can be widely combined to form different requirements. Compared with S7-200 PLC, S7-300 PLC adopts modular structure and has high speed (0.6~0.1 μ s) Instruction operation speed; More complex arithmetic operations are effectively realized by floating-point operations; A tool with user interface is convenient for users to assign parameters to all modules; Convenient man-machine interface service has been integrated into S7-300 operation, and the programming requirements of man-machine dialogue are greatly increased. SIMATIC human machine interface (HMI) obtains data from S7-300, which transmits these data according to the user's refresh speed. S7-300 operation automatically processes the transmission of data; The intelligent diagnosis of CPU continuously monitors whether the function is normal, records errors and special events (such as timeout, module replacement, etc.); Multi level password protection enables users to highly and effectively protect their technical secrets and prevent unauthorized and modification; S7-300 PLC is equipped with an operation selection switch, which can be operated like a key. When the key is used, the operation cannot be changed, so as to prevent or rewrite the user program. With powerful communication function, S7-300 PLC can provide communication configuration function through programming the user interface of step 7, which makes the configuration very easy and simple. S7-300 PLC has a variety of different communication interfaces, and connects AS-I bus interface and industrial Ethernet bus through a variety of communication processors; The serial communication processor is used to connect point-to-point communication; Multipoint interface (MPI) is integrated in CPU, which is used to simultaneously connect programmer, PC, man-machine interface and other automation controls such as SIMATIC s7/m7/c7.
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