The 1746-C7 is a chassis module belonging to the Allen-Bradley SLC 500 series of programmable logic controllers (PLCs) manufactured by Rockwell Automation. It is used to house and organize the various modules in the SLC 500 system. Here are some key details about this module:

1. Chassis Type: The 1746-C7 is a 7-slot chassis module. It provides slots to accommodate up to 7 modules, including the processor module and various I/O modules.

2. System Configuration: The 1746-C7 chassis is part of the modular SLC 500 system. You can install different modules in the chassis to configure the controller based on the specific application requirements.

3. Mounting and Installation: The module is designed for mounting on a flat surface or in a panel enclosure. It provides a secure and organized structure for the other modules in the system.

4. Power Supply: The 1746-C7 chassis requires a separate power supply module, such as the 1746-P7 or 1746-A7, to provide power to the modules installed in the chassis. The power supply module is typically installed in the first slot of the chassis.

5. Communication: The 1746-C7 chassis supports communication between the modules in the system, allowing data exchange and coordination of the control processes.

6. Expansion: The 1746-C7 chassis provides flexibility for system expansion. You can add additional modules to the empty slots in the chassis as needed, enabling the system to accommodate changing application requirements.

When installing the 1746-C7 chassis, it is important to follow the proper guidelines and instructions provided by Rockwell Automation in the product documentation. This will ensure correct installation and integration of the SLC 500 system components.