The ladder rung means that in order to switch on Y1, either X1 and X2 or X3 and X4 must be switched on. Y1 : (X1 - AND ... Examples of ladder diagram symbols are. ... The coils and contacts are basic symbols of ladder diagram instruction set.
|Title||:||Computer-Based Industrial Control, 2/e|
|Publisher||:||PHI Learning Pvt. Ltd. - 2010-01-30|