Allen-Bradley 1784-PCD Data Highway Plus Interface Card

Allen-Bradley 1784-PCD Data Highway Plus Interface Card is a legacy computer interface that provides Data Highway Plus (DH+) connectivity from a workstation to AB DH+ networks. Specifically designed to bridge a PC to the AB DH+ fieldbus, the 1784-PCD enables PC-based monitoring, diagnostics, and configuration of DH+-connected controllers and devices without altering the DH+ backbone. As part of Allen-Bradley's 1784 interface family, this card is commonly used in older automation setups to integrate desktop-era software with PLCs and remote I/O on DH+ networks, facilitating data exchange and program access through compatible software and cabling. Typical applications include equipment commissioning, on-site diagnostics, and ongoing maintenance of legacy AB systems where DH+ remains in operation, allowing operators to access controller data, I/O status, and program logic from a PC. This interface card is intended for use in historical automation environments, offering a direct hardware path between a PC and the DH+ network to support legacy control architectures while preserving existing DH+ infrastructure.