To reduce the input points in the application of PLC

In practice, often will encounter the problem of inadequate I/O points, can be extended by increasing unit or extension module solution, also can through to the input signal and output signal processing, reduced the I/O points needed for practical methods to solve. ( 1) Time-sharing grouping input. General system is equipped with the 'automatic' and 'manual' in the two works, one of two ways don't perform at the same time. Will two ways of grouping input, thus reducing the actual input points. As shown in figure 1. PLC controller by I1. 0 recognition 'manual' and 'automatic', program to perform a manual or automatic procedures. The diode is used to cut the parasitic circuit. If no diode in figure, switch in the 'automatic', closed S1, S2, S3, S4 disconnect, when the current flow from L + terminals, formed by the S3, S1, S2 parasitic loop current flow into the I0. 1, make the I0. 1 error to ON. After the switch series, such as into the diode, then cut off parasitic loop. ( 2) Hardware encoding, PLC controller internal software decoding. As shown in figure 2. ( 3) The input point. Will function normally closed contact of the same series or will normally open contacts in parallel, it only takes one input points. General multipoint operation starting stop button, protection, alarm signal can be used this way. As shown in figure 3. ( 4) Some of the system input signal is set outside the PLC. System some features in a single input signal, as some of the manual button, thermal relay normally closed contact is not necessary as input signals to PLC, can be directly set it in the output driver circuit.
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