Keep Relay Parameters Exclusive ((free)) - Fanuc

If the signal to activate Option A is triggered, it passes through a normally closed contact of K0001.1 . If K0001.1 is already active, the circuit opens, and K0001.0 cannot turn on.

If K5.0 also secretly controls the chip conveyor direction, you have a non-exclusive parameter. This creates unpredictable machine states.

If you can tell me the and model , I might be able to provide more tailored information regarding their specific use of keep relays. Share public link

In PMC ladder design, refers to a control scheme where two or more Keep Relay bits must never be active simultaneously. If both bits are set to 1 at the same time, it creates conflicting instructions within the PLC ladder, leading to unpredictable machine behavior, hang-ups, or severe structural collisions. Why Exclusivity Matters

Keep relays can enable or disable external hardware like pallet changers (e.g., K15.0 on some RoboDrills) or chip conveyors without changing the ladder logic. fanuc keep relay parameters exclusive

The screen will display the parameters in a matrix format, showing the byte number (e.g., K0000) and bits 7 through 0.

Viewable and editable via the PMC MNT (Maintenance) or PMC PRM (Parameter) screens on the FANUC MDI panel. Common Uses

By designing keep relays to be exclusive, you prevent the machine operator from accidentally turning on two conflicting logic paths simultaneously, which could cause mechanical crashes or safety hazards. Writing Exclusive Ladder Logic with Keep Relays

Unlike standard volatile relays, keep relays store semi-permanent machine configurations, options, and troubleshooting states. Understanding how keep relays function, how to read their bit structures, and which specific K-parameters are reserved or exclusive to Fanuc functions is essential for any CNC programmer, maintenance technician, or field engineer. 1. What are Keep Relays (K-Parameters)? If the signal to activate Option A is

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These are exclusive to the machine tool builder. They are used to toggle specific options. A builder might use K15.7cap K 15.7

Most exclusive keep relays function as an A/B switch. For example, if Bit 0 is set to 1 , Function A is active and Function B is completely disabled. Setting it to 0 reverses this state. Mutually Exclusive Bit Arrays

K0012.1 = 1: Detachable 4th Axis indexer installed (Plugs and pressure switches monitored). This creates unpredictable machine states

In FANUC CNC systems, Keep Relays (K-parameters) act as software switches within the Programmable Machine Control (PMC). Machine Tool Builders (MTBs) use them to toggle specific machine options, safety interlocks, and operational modes without changing the core ladder logic.

This is the classic symptom of a .

After changing exclusive parameters, test the operations at low override speeds in manual mode before running an automatic cycle.