Fanuc Focas Documentation Verified May 2026

FOCAS is FANUC’s official library (DLLs/API) for reading/writing data from FANUC CNCs (Series 0i, 30i, 31i, 35i, etc.) over Ethernet or HSSB. FANUC does not publicly host full PDFs on an open web page. You must access them through:

// 1. Connect cnc_allclibhndl3("192.168.1.100", 8193, 10, &h); fanuc focas documentation

unsigned short h; // Handle

// 2. Read macro variable #100 ODBMACRO macro; cnc_rdmacro(h, 100, 0, ¯o); // macro.data = value unsigned short h