Here’s a clear summary of the Allen-Bradley 1746-A13(C) chassis module:

 Overview

• Type: SLC 500 I/O chassis
• Slots: 13 module slots for I/O and specialty modules
• Series: Part of the SLC 500 modular PLC system

 Physical & Installation

• Mounting: Panel mount
• Dimensions: Approx. 502 mm (W) × 171 mm (L) × 145 mm (D)
• Operating Temperature: 0°C to 60°C

 Electrical & System Integration

• Backplane: Provides power and communication between modules
• Compatibility: Works with SLC 500 processors and expansion modules
• Thermocouple Modules: Can be installed in any slot except slot 0 (reserved for processor)