Which module can have multiple owners according to PLC architecture?

In PLC architecture, the communication module is the correct choice as the module that can have multiple owners. A communication module is designed to facilitate data transfer between various parts of a control system, which may include multiple PLCs, HMIs, or other control devices. This sharing capability allows it to serve multiple devices that need to access or exchange information simultaneously, enabling a more integrated and flexible system design.

The communication module handles protocols and interfaces that allow different owners or systems to communicate with each other efficiently. This is essential in distributed control systems where multiple controllers or devices need to work together, share data, or coordinate actions.

In contrast, input and output modules typically serve a single controller, directly interfacing with sensors and actuators, while the controller module itself manages the overall operation of the PLC system. This means they are not designed for ownership by multiple systems at the same time, as they are primarily dedicated to the specific functions of data acquisition and process control relevant to one PLC unit.