The equivalent circuit of PLC

From the PLC control system and electric control system, we can know the PLC user program ( Software) Instead of relay control circuit ( Hardware) 。 PLC for users, therefore, can be equivalent to many various kinds of 'soft relay' and 'soft connection' collection, and the user programs is the 'soft relay' with 'soft connection' and 'contact' according to certain requirements to connect the control circuit. In order to better understand the equivalent relation, the following through an example to illustrate. As shown in figure 1 for three-phase asynchronous motor one-way starting operation of the electric control system. Among them, by input devices SB1, SB2, FR contact the input parts of the system, made up of output devices KM output part of the system. Figure 1 a) three-phase asynchronous motor one-way run electric control system Main circuit b) Control circuit with PLC to control the three-phase asynchronous motor, a PLC control system, based on the above analysis shows that the system main circuit is constant, as long as the input devices SB1, SB2, FR contact connected with the input end of the PLC, and output devices KM coil connected with the output of the PLC, constitute the basis of the PLC controller control system hardware circuit input or output. While the function of the control part by PLC of the user program to implement, its equivalent circuit is shown in figure 2. In FIG. 2 the equivalent circuit diagram of PLC, the input devices SB1, SB2, FR, and PLC internal 'soft relay' X0, X1, X2 'coil' corresponding, controlled by the input device corresponding to the state of 'soft relay', through the 'soft relay' external input device status into the PLC internal state, this kind of 'soft relay' called input relay; By the same token, the output device KM to the 'soft relay' Y0 within the PLC, controlled by the state of 'soft relay' Y0 corresponding state of the output device of KM, by these 'soft relay' will output the PLC internal state, to control the external output device, this kind of 'soft relay' called the output relay. Therefore, the PLC user program to realize is that how to use the relay X0, X1, X2 input to control the output relay Y0. When complex control requirements, application and other types of PLC internal 'soft relay', such as auxiliary relays, timers, counters, etc. , in order to meet the control requirements. Note that the PLC controller equivalent circuit of the relay is not the actual physical relay, it is essentially the state of the memory unit. The unit status to '1', equivalent to a relay connected; Unit state to '0', then the equivalent of relay disconnect. Therefore, we call these relay 'soft relay'.
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