To study, understand and perform experiments on timers and counters
                    System reliability in case of DCS is
                  
                  
                  
                
                  
                    DCS has a ------------ structure.
                  
                  
                  
                
                  
                    On which level does the field instruments are in the architecture of DCS?
                  
                  
                  
                
                  
                    Limit function is available under ____ library in DCS.
                  
                  
                  
                
                  
                     If any one of the two inputs goes high the output is high. To achieve this condition the function block to be used is __________.