Schneider Electric 140CRA31908 Modicon Quantum RIO Adapter

The Schneider Electric 140CRA31908 Modicon Quantum RIO Adapter is a non-Ethernet Remote IO (RIO) drop adapter that enables a Quantum or M580 system to connect an S908 RIO bus to a Quantum EIO drop. Designed as the S908 RIO drop interface for Quantum/M580 installations, the module sits in the Quantum EIO drop to bridge the S908 I/O network with the system backplane. It is used specifically for non-Ethernet RIO architectures and is not compatible with Quantum Ethernet I/O architectures. Schneider Electric documents refer to this part as the M580 Quantum S908 RIO Drop Adapter and provide installation and configuration guidance for adding and configuring the S908 RIO drop. A conformal-coated variant, 140CRA31908C, is also referenced for applications requiring environmental protection. The 140CRA31908 is listed by distributors and component catalogs as an adapter module in the Modicon Quantum family, reinforcing its role as an accessory for S908 RIO integration. In practice, the adapter is installed within the Quantum EIO drop to facilitate S908 RIO communications in legacy or non-Ethernet configurations. Schneider’s installation guides (including NVE75259 and S1B21657) cover setup steps for this adapter and its role in connecting S908 to Quantum/M580 drops.