Normally Closed Switch In Plc. But those standards are quite expensive if you are just looking for the symbols used in ladder diagrams. The normally closed contact will turn on the input to the plc card in its normal state.
The lamp will energize only if someone presses the switch holding its normally open contacts in the closed position normally open switch contacts are sometimes referred to in the electrical industry as form a contacts. The normally closed contact will turn on the input to the plc card in its normal state. When you activate a normally open actuator the input bit will switch to 1.
Open no current flow.
Unlike open contacts with normally closed contacts signal will interrupt a contact or turn a relay off. When you activate a normally open actuator the input bit will switch to 1. This can also be illustrated in a table. In the default state inactivated of a normally closed actuator the input bit is 1.
