Fanuc Keep Relay Parameters Exclusive ((install)) Page

Keep relays act as the interface between the machine's hardware and the PLC ladder logic. They are primarily used by Machine Tool Builders (MTBs) to define how a specific machine should behave without requiring a rewrite of the entire ladder program. Common uses include:

Each Keep Relay (typically designated as K0.0, K1.2, etc.) is a single bit of memory. When a machine builder writes the ladder logic, they assign these relays to control discrete behaviors. For example: fanuc keep relay parameters exclusive

Most modern Fanuc controls (Series 31i, 32i, 0i-D and later) allow OEMs to apply to specific ranges of Keep Relays. Keep relays act as the interface between the