Ladder electrical wiring control sofware8/30/2023 ![]() ![]() The first process is necessary to create what is called a ladder diagram. Let us now replace the Relays Definition by a PLC. Hence, ac current flows through the bell and the sound of the bell can be heard. This magnetic field causes the contacts of the relay to close. ![]() As soon as the switch is closed, current starts to flow through the coil causing a magnetic field to build up. When the switch is open, no current flows through the coil of the relay. In this case we are using a dc relay to control an ac circuit. One circuit is the dc part and the other circuit is the ac part. 21.28, it is seen that it consists of two separate circuits. When the switch closes, current is applied to a bell causing it to sound. In Fig. A switch, relay and a bell is connected as shown in Fig. Let us consider the following example in which we will simply turn ON a bell, whenever the switch is closed. ![]()
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