To reduce the cost of using the system, it can be considered from two perspectives, hardware and software, in terms of hardware can be considered through the combination of circuitry to reduce the opportunity to use I/O points, in terms of software is to expand the use of I/O points through the combination of the program value, to achieve a little multi-use. A: the hardware to achieve cost reduction Hardware to reduce costs in the use of existing PLC design control system has practical significance. Several methods can be used to achieve the following: (1) external signal grouping input: In the system with manual control and automatic control of two effects, automatic control procedures and manual control procedures are generally not implemented at the same time. At this time, the automatic and manual signals can be grouped according to the different control states required to access the PLC input terminals SBI and SB2 buttons are used X0 input, but they are not simultaneously play a role, so that through the conversion of the PLC hardware common point (COM) wiring and software time-sharing implementation of their different methods of user programs, so that the PLC of an input point can be respectively respond to the state of the two input signals. The role of two input points to complete the PLC in two working states of the input function, to improve the efficiency of the use of PLC input points, saving the actual number of PLC input points. The SA is used to select the automatic/manual program for automatic/manual switching and he diode is used to cut off the parasitic signal to avoid the generation of false signals. (2) Combined input switching components In the motor control circuit shown in Figure 2(a) for multi-point start/stop, the motor can be controlled to start and stop at different places. If PLC control is used, the wiring methods in Fig. 2(b) and (c) can be used respectively. The below PLC parts will you need? Contact with Vivi (sh_plc@163.com). B&R X20CS1030 Communication Module Siemens 6ES7590-1AE80-0AA0 Mounting Rail B&R X20AO2632 ANALOG OUTPUT MODULE Allen Bradley 1763-L16DWD Micrologix 1100 Programmable Controller
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