In a PLC system, what is typically the first step in the cycle of operation?

The first step in the cycle of operation for a Programmable Logic Controller (PLC) system is to examine inputs. This step involves reading the status of all input devices and sensors connected to the PLC. The PLC needs to know the current state of these inputs to make decisions based on the programmed logic.

Examine inputs serves as the foundation for the entire operation cycle because the processed information from this step informs how the outputs will be controlled. Without this initial step, the PLC would not have the necessary data to execute any logic or update outputs. This systematic approach ensures that the control process is both accurate and timely, reflecting the current conditions of the system being monitored or controlled.

While performing logic, updating outputs, and configuring hardware are important functions within a PLC system, they follow the examination of inputs. The logic is executed based on the inputs received, outputs are updated according to the logic results, and hardware configuration is typically done either during initialization or when changes are needed, rather than at every cycle iteration.