When analyzing the operation of a relay control system, it is helpful to have some way to temporarily denote the conductive status of switch contacts and the energization status of relay coils (i.e. a notation we might sketch using pencil on a diagram to help us follow the operation of the...
AsymbologyI recommend is the use of arrow and “X” symbols to represent power flow and no power flow (respectively). These symbols clearly denote component status while avoiding confusion with the symbols used to denote normal status of switch contacts. In this next diagram, we assume the app...