Fanuc Keep Relay Parameters Exclusive __top__ Jun 2026
Do you have the from your machine builder? Share public link
In FANUC CNC and robot controllers, are bit-type non-volatile memory elements used to store machine-specific configuration settings. Some Keep Relays have exclusive, pre-defined functions — meaning their behavior is fixed by FANUC and cannot be reassigned by the OEM or end user.
: These are often "exclusive" in that they are reserved for system functions such as keep type memory control or internal programmer functions. For example, K16 is frequently used to manage memory types or ladder editing states. How to Access and Modify Get to know how to change the Keep Relay!
Exclusive Keep Relays are useless without a memory map. FANUC does not standardize these for machine builders. K10.0 might mean "Chip Conveyor Installed" on a Mori Seiki, but "High Pressure Coolant" on an Okuma. If you lose the electrical drawings or the PMC ladder printout, troubleshooting becomes a nightmare.
If you tell me your exact FANUC model and the parameter numbers (or the functionality you need to protect), I can produce a step-by-step procedure tailored to that controller and sample PMC/parameter commands. fanuc keep relay parameters exclusive
Changing these parameters requires cautious access to the PMC maintenance screens. Set the machine to MDI mode .
Bypassing safety switches via Keep Relays is occasionally necessary for diagnosing bad sensors. However, failing to maintain the exclusive nature of these maintenance bits can leave door interlocks permanently unlatched, exposing operators to spinning spindles and flying chips during fully automatic cycles. Hard Mechanical Collisions
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
Always return PARAMETER WRITE to 0 to prevent accidental changes. Important Safety Considerations Do you have the from your machine builder
Keep relays are memory addresses assigned to the letter . Unlike standard internal relays (R-addresses) which reset when the machine loses power, K-parameters retain their status (0 or 1) even after a complete control power-off.
It is vital to note that keep relay assignments are . For instance, K10.7 might control an air blast on one machine but handle a pallet changer on another. Operators should always consult the specific ladder diagram documentation or the machine's manual before making adjustments. To help you with a specific setup,g., Mori Seiki, Doosan)?
Keep relay parameters, also known as keep relay data, are a set of parameters stored in the memory of Fanuc control systems. These parameters are used to retain specific data, such as machine settings, offsets, and configuration information, even when the power is turned off. The keep relay parameters are stored in a special type of memory, known as non-volatile memory, which retains its contents even when the power is cycled.
They are structured in bytes, where each address contains 8 bits (numbered 0 to 7): K0002 Bits: K0002.0 , K0002.1 , K0002.2 ... up to K0002.7 Understanding "Exclusive" Logic in PMC : These are often "exclusive" in that they
Here are some common issues that may occur with Fanuc keep relay parameters exclusive:
— Some exclusive K relays directly control emergency stop behavior or hardware interlocks. Changing them outside FANUC specifications can create hazardous conditions.
Use the up/down arrow keys or the page keys to scroll to the target K-parameter. Step 3: Change the Bit Value
If a keep relay refuses to change or reverts after a power cycle, it is often because: