Identify your target address (e.g., K0005). Bits are counted right to left , from 0 to 7. Type the new value ( ) and press : Return to the setting screen and set PARAMETER WRITE Common Keep Relay Applications
Key in the desired K-address (e.g., K17) and press .
Press the soft key for [PMCMC] or [PMCPRM] . Open Keep Relays: Press the soft key for [KEEPRL] or [K] . Modifying a Keep Relay
To prevent human error from damaging the machine, experienced ladder developers write interlocking rungs. If an operator sets two exclusive K-relays to 1 , the PMC ladder will typically execute one of the following safety actions:
They are "kept" in memory even when power is turned off, ensuring the machine configuration remains stable. Variable Use: fanuc keep relay parameters exclusive
After changing exclusive parameters, test the operations at low override speeds in manual mode before running an automatic cycle.
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:
Keeping keep relay parameters exclusive is crucial for maintaining the performance and reliability of Fanuc control systems. Some of the key reasons why keep relay parameters should be kept exclusive include:
Return to the SETTING screen and change "Parameter Write" back to 0 . Common Applications for Keep Relays Identify your target address (e
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 provides the hardware and core firmware, but the Machine Tool Builder (e.g., Haas, Mazak, DMG MORI, Doosan) defines the Keep Relay map. This means:
: Reserved for PMC managing software data; these should generally not be used for custom sequences.
Keep relays are organized by address (e.g., K0, K1, K2) and then by individual bits (0 through 7). Press the soft key for [PMCMC] or [PMCPRM]
Fanuc, a leading manufacturer of industrial automation and CNC systems, provides a range of products and solutions for various industries. One of the key aspects of Fanuc's control systems is the use of keep relay parameters, which play a crucial role in maintaining the system's performance and reliability. This paper aims to provide an in-depth analysis of Fanuc keep relay parameters, their significance, and the importance of keeping them exclusive.
Exclusively switching a chuck or vice between ID (Internal Diameter) clamping and OD (External Diameter) clamping.
Change the "Parameter Write" setting back to 0 once finished.