Allen-Bradley 1785-KA3 is a Data Highway Plus (DH+) interface communication module that bridges PLC-2 family processors to a DH+ network, enabling DH+ communications between PLC-2 controllers and other DH+ devices. It mounts in any slot (except the leftmost) of a Bulletin 1771 I/O chassis and provides a DH+ dropline interface. It supports PLC-2 family processors including PLC-2/30, -2/20, -2/17, -2/16, -2/15, -2/05, -2/02, and Mini-LC-2. Part number 1785-KA3 (catalog 440023305) identifies this specific interface module.
