Using the relay circuit or PLC ladder diagram to realize the switch quantity logic operation, for example

Using a relay circuit and PLC controller ladder diagram can realize the switch quantity logic operation. Figure 1 - 4 above is PLC controller ladder diagram, ladder diagram of certain programming elements ( If the output relay and auxiliary relay) 'Electricity', by the coil in the normally open contact closure, normally closed off contact, called the programming element 1 state. When the coil 'power & quot; The normally open contacts disconnect, normally closed contact closure, called the programming element 0 state. Figure 1 - 1. With relay circuit or ladder diagram can realize the basic logic operations, contact series 'and' operation can be realized, the contact of the shunt can realize 'or' operation, with a normally closed contact control coil can realize 'not' operation ( As shown in figure 1 4) 。 Multiple contacts of the circuit in series, in parallel can achieve complex logic operations, such as l - 3 relay circuit implementation of logical operations available logical algebra expression is expressed as KM = ( SBI+KM) , SB2, FR type logic or the plus sign said, logic and multiplication sign, said 'not' operation on line.
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