Allen-Bradley 1771-OGD PLC-5 Digital DC Output Module

Allen-Bradley 1771-OGD PLC-5 Digital DC Output Module is a 16-point TTL digital output module designed for the PLC-5 1771 I/O system. It provides 16 TTL DC outputs at 5 V and uses open-collector outputs, enabling direct interfacing to TTL-level devices; the module is intended for mounting in a 1771 universal I/O chassis and is compatible with chassis types 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B. A distinctive safety feature of the 1771-OGD is a fuse that protects the +5 V DC power supply and the module’s output terminals from accidental voltage conditions, such as overvoltage, reverse polarity, or unwanted AC coupling. This TTL output module belongs to the PLC-5 family and occupies a single slot in the I/O chassis, delivering digital control across all 16 channels for straightforward interfacing with TTL-compatible loads.