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The 1771-SDN from Allen-Bradley is a DeviceNet communication module designed for seamless integration with the 1771 family, facilitating efficient remote I/O architecture and data exchange with visualization systems. It features two DeviceNet ports with individual channel indicators and comes in three series‚A, B, and C‚with inherent backward compatibility, allowing Series B to replace Series A, and Series C to substitute Series B and A, with a simple switch configuration required for Series C. The module supports Change of State, Cyclic I/O, and Pass-through functionality, providing robust communication capabilities, with up to 63 configurable nodes via node address switches. Its interface includes essential components such as module status indicators and DeviceNet ports, with series B and C offering a full set of these features.