Keep Relay Parameters Exclusive Work - Fanuc

During power loss, a K parameter can record which step of an automated process (like a tool change) is currently active, enabling the machine to resume safely from the correct step upon restart.

For high-value applications (often robotics or high-end mills), FANUC offers option . This allows an administrator to assign user roles (Installer, Setter, Operator) and passwords. If a user is logged in as an "Operator," they are excluded from accessing the pages that modify system keep relays entirely.

If a Keep Relay change doesn't take effect or resets on startup, it's a strong clue: the value is being overwritten by another part of the ladder program. Troubleshooting often involves searching for a for that specific K relay. fanuc keep relay parameters exclusive

Find the steps to (e.g., door interlock or conveyor)?

The underlying ladder logic dictates that these two bits are . If a technician forces both bits to 1 , the PMC logic will either execute a fault routine, generate a custom machine alarm (EX-alarm), or defaults to a safe state to prevent both spindles from trying to command conflicting gear ranges or rotation signals at once. Hard-Coded vs. Logic-Enforced Exclusivity During power loss, a K parameter can record

might control aspects of the Dual Check Safety (DCS) system.

Keep relays have battery-backed, non-volatile memory. This means that the settings are retained even after the machine is powered off or during a power outage. If a user is logged in as an

Verdict: Use Keep Relays for exclusive "Yes/No" hardware options. Use Data Tables for numerical data or counters.

To help you document your specific machine setup, could you provide the (e.g., 0i-TF, 31i-B) or the exact K-parameter addresses you are looking to change? Knowing the machine tool builder can also help find the exact function of those exclusive bits. Share public link

K0012.0 = 1: No 4th Axis installed (Hardcoded dummy bypass signals active).

Often used to enable specialized menus for loading/saving ladder diagrams. 3. How to Modify Keep Relays