Código 5311: FSSB: ILLEGAL CONNECTION
Descripción del problema y advertencia de seguridad
El Fanuc 16i/18i/21i CNC ha desencadenado una alarma crítica FSSB: ILLEGAL CONNECTION. Se requiere la atención inmediata de un operador calificado o técnico de mantenimiento para evitar daños secundarios al equipo o piezas estropeadas durante el ciclo de fabricación. Asegúrese siempre de seguir los procedimientos de seguridad estándar y LOTO antes de acceder a los armarios eléctricos.
Pasos oficiales de solución de problemas
1. This alarm is issued if, in a pair of axes in which one axis has an odd servo axis number (parameter No. 1023) and the other has an even servo axis number that is adjacent to the odd servo axis number, one of the axes is assigned to an amplifier connected to an FSSB in a system different from that for the other axis. 2. This alarm is issued if the system does not satisfy a constraint for performing high–speed HRV control, current control periods for two FSSBs are different, and it is specified that pulse modules connected to an FSSB in different paths are to be used. ??? BP/S alarm BP/S alarm occurs in the same number as the P/S alarm that occurs in ordinary program edit. (P/S alarm No. 070, 071, 072, 073, 074, 085 to 087) Modify the program.
Source: Fanuc Series 16i/18i/21i-B Operator's Manual, Appendix G Alarm List (B-63864EN/03)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
Acerca de las alarmas de Fanuc 16i/18i/21i CNC
Los controladores industriales construidos por Fanuc están diseñados con amplios sistemas de diagnóstico para proteger los circuitos internos y los enlaces mecánicos. Cuando un 16i/18i/21i CNC arroja un código de error como 5311, generalmente indica un desajuste entre los valores ordenados y la retroalimentación real del sensor.
Lista completa de alarmas: 360 Fanuc 16i/18i/21i CNC códigos.
Have a better solution?
Help the industrial community by sharing your repair experience for code 5311.
Need a searchable reference for more Fanuc 16i/18i/21i CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026