How to choose the switch input and module?

PLC controller input module is used to detect receives the signal input device, and the input signal to a low voltage signal of PLC controller internal to accept. The type of the input signal and the selection of voltage grade common switch input module and there are three kinds of signal types: dc input, ac input and ac/dc input. When the choice generally according to the scene to determine the input signal and the surrounding environment. Input module of contact and reliable, and suitable for the oil mist, dust under the conditions of use; Dc input module of the delay time is shorter, can also directly with close to switches, photoelectric switches and other electronic input device to connect. PLC controller switch input module according to the input signal voltage and size classification: dc 5 v, 24 v, 48 v, 60 v, etc. ; Ac, 110 v, 220 v, etc. When the choice should be according to the field input device and the distance between the input module to decide. General 5 v, 12 v, 24 v at close range for transmission. Such as: 5 v input module shall not exceed 10 m distance, as far as far should choose high voltage level of the module. Input connection mode selection by the different methods of input circuit wiring, switch input module and can be divided into transfer point input and grouping type two kinds, as shown in figure 1. Hui point input module of the input point only Shared a COM port; And grouping type input module is divided into several groups, a group of Shared a COM, is separated between each group. Grouping type input module per point teach high price, if you don't need to separate between the input signal, should choose to send point. At the same time, through to the number of input points to is made of high input module ( 32 points, 48 points) , the module should be considered at the same time, through to the number of input points is generally not exceed 60% of the points.
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