The 140CRA31200 is an Ethernet RIO drop adapter in the Modicon Quantum family of PLCs. It is the adapter module located in any Quantum Ethernet I/O installation. A remote I/O drop can be connected directly to the main ring cable or to a sub-ring cable.
It has 3 ports, and two integrated connection types – an Ethernet IP/Modbus TCP Service Port and an Ethernet IP/Modbus TCP Device Network. The 140CRA31200 module exchanges data with the remote I/O head module which is the 140CRP31200. Output modules are updated with data received from the remote I/O adapter. The input data is then collected and published to the remote I/O head adapter. The protocol used in the exchange is EtherNet/IP. The remote I/O scanner views the module as a remote I/O adapter. The exchanges are deterministic, which means that the time it takes to resolve a remote I/O logic scan is predictable.
Because the 140CRA31200 has 3 external Ehternet ports, it has 3 MAC addresses (but only 1 IP address). two of the Ethernet ports allow implicit I/O exchanges with a remote I/O scanner adapter. An implicit I/O exchange has a maximum frame size of 1,400 bytes. The ports can be implemented alone or in adapter mode. A maximum of 31 140CRA31200 adapter modules can be used in a single Ethernet remote I/O network. Ensure that you carefully plan network topology.
The 140CRa31200 has 4 local signaling LEDs: 1 green for Run, 1 green/red for module status (Mod Status), 1 green/red for network communication status (Net Status), and 1 red for I/O. Its ambient air temperature for operation should be kept to between 0 to 60 °C. If you are storing your module, it should be keep to -40 to 85 °C. The module can comfortably operate at an altitude of 2000 meters above sea level.