The FANUC A20B-2900-0361 is a Communication Control Module (PMC Command Module) used in compatible FANUC CNC systems. FANUC Series 15 documentation identifies it as a communication control module, while specialist references associate it with Series 16 and 18 controls, including Model A and Model B configurations. It supports CNC communication and PMC-related control functions and is used for machine-tool maintenance, replacement, and repair. Compatibility must be verified against the control model and installed configuration. [stock available]