The B864–001 register output module provides a 5 V TTL or CMOS-compatible interface between a PLC and peripheral field devices.The B864–001 register output module operates in either BCD or binary mode. The desired mode is operator selectable, with the 16-bit output either having BCD values in the range 0000- 9999 or binary output in the range 0000- FFFF hex.

The B864-001 is an eight-channel register output module with eight 16-bit registers. A channel is defined as a 16-bit data path. The channels can be configured as eight BCD or eight binary registers via the appropriate switch setting.

The module is organized in a group strobe arrangement with the 16 datalines associated at a given moment with one of the eight strobe lines. Each strobe line addresses one of the devices on the data bus and enables it to transmit data to a given peripheral device to the exclusion of the other devices. The data lines are routed to all devices. The B864-001is operated in module-select mode. In module- select mode, all eight data registers are transferred in a single ourbus cycle.