What are 'status bits' used for in a PLC?

Status bits are utilized in a PLC to indicate the state of inputs and outputs within a control system. They provide real-time feedback on whether an input device (such as a sensor or switch) is activated or whether an output device (like a motor or relay) is currently supplying power or not. This information is crucial for the PLC to make timely and appropriate decisions based on the current conditions of the system it is managing.

For instance, if a sensor detects an object, the corresponding status bit may change to represent that the input is ON. This change can trigger different actions within the PLC program, allowing it to manage processes dynamically. Status bits are essential for monitoring and controlling automation equipment effectively, supporting the decision-making processes of the PLC in various applications.