Fanuc Focas Documentation 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:

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

unsigned short h; // Handle

// 1. Connect cnc_allclibhndl3("192.168.1.100", 8193, 10, &h); // Handle // 1. Connect cnc_allclibhndl3("192.168.1.100"

// 3. Read active alarms cnc_rdalarm(h, 0, 10, &alarm_cnt, alarm); // 3. Read active alarms cnc_rdalarm(h