If Switch SW-3 is on, which status indicator on the PLC input module in slot 1 would be on?

When Switch SW-3 is on, it corresponds to a specific input channel within the PLC's input module, typically associated with a particular slot. In many PLC systems, the input module has multiple indicators for each switch or input channel. These indicators light up in response to the state of their respective inputs—indicating whether a switch is opened or closed, or in this case, whether SW-3 is active.

In this scenario, if Switch SW-3 is engaged, it influences the second status indicator on the input module. This means that indicator number two is specifically designated to show the input status related to SW-3. Therefore, when SW-3 is on, the operational logic of the input module determines that the second indicator will illuminate, affirming that the corresponding switch is in the 'on' position.

Understanding the mapping between the switches and their corresponding indicators is crucial for monitoring and troubleshooting PLC systems effectively. This knowledge allows engineers and operators to quickly ascertain which inputs are active based on the illuminated status indicators.