Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 K0000 0 0 0 1 0 1 0 0 K0001 1 0 0 0 0 0 0 0 Step 3: Changing the Exclusive Bit
: Switch the machine to MDI mode , go to the Setting screen, and change "Parameter Write" from 0 to 1 .
While machine tool builders (like Doosan, Mori Seiki, Haas, or Mazak) are free to assign K00 through K89 to whatever machine options they choose, .
Because Keep Relays are PLC-based (PMC), they are used to manage functions that are not built directly into the Fanuc software but are instead added by the builder. Customization: fanuc keep relay parameters exclusive
Always reference the machine's original electrical manual. Look for the "PMC Parameter" or "Keep Relay" appendix. MTBs explicitly list which K-bits are exclusive in these documents.
A is a specialized, non-volatile bit in the FANUC PMC ladder logic. Unlike regular internal relays ( ) or input/output relays (
Ensure that any physical switches on the machine match the software state selected by the exclusive keep relay. For example, if a keep relay sets the machine to "Robot Loading Only," but the physical manual-override key is turned on, the PMC will halt all automatic cycles. Address Bit 7 Bit 6 Bit 5 Bit
Since this is a technical topic rather than a consumer product, this "review" evaluates the functionality, necessity, advantages, and potential pitfalls of using exclusive (dedicated) keep relays within FANUC CNC and PMC systems.
Reserved for core system functions, such as safety circuit interfaces or bypassing specific system-level alarms. How to Access and Change Keep Relay Parameters
Mastering Fanuc Keep Relay Parameters: An Essential Technical Guide A is a specialized, non-volatile bit in the
Builders use K-relays to toggle features like tool changers, door interlocks, or coolant options. Non-Volatile:
: They are vital for bypassing faulty sensors (like a conveyor rotation sensor) to keep production running while awaiting repairs. Accessing and Modifying Keep Relays
FANUC Keep Relays are displayed in a byte format consisting of 8 individual bits, numbered from right to left (Bit 0 to Bit 7).
A single machine design might support multiple types of automation loading systems. Manual Operator Loading K0012.1: Gantry Robot Interface Active K0012.2: Bar Feeder Interface Active
The bit is being written to by a "coil" in the PMC ladder logic. In this case, the software overrides any manual changes.