Allen-Bradley 1768-KY1 Replacement Key for CompactLogix Controllers

1768-KY1: The Mode-Switch Key for CompactLogix Controllers

The 1768-KY1 is a replacement key rather than a controller — and on CompactLogix controllers that key is not an accessory. The controller mode (RUN, PROGRAM, REMOTE) is selected by a physical key switch, and the key is removable in some modes specifically so that the mode cannot be left in a state that would let the machine run unattended.

It is compatible with the 1768-L43 and 1768-L45 series and designed for field replacement. Shipping weight is 2 lbs and dimensions are 8 x 8 x 5 in.

CompactLogix and Controller Platform Parts

All Allen-Bradley parts · PLC & I/O Modules

Why a Spare Key Matters More Than It Looks

The key is small, cheap, and its absence stops a machine. On a machine where the key is removed for commissioning or maintenance and not reinstalled, the controller cannot be returned to RUN mode — which is a production stop rather than a control fault.

Because it is also a security-relevant item — the key physically controls who can change controller mode — replacement keys should be treated as controlled spares rather than as consumables left in a drawer.

Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: US. Listed by AutoDCS Tech Parts Team · Last updated 2026-10-07.

All Allen-Bradley parts