Available. The Siemens 6FX1-121-4BL02 is a specialized printed circuit board (PCB) designed for the SINUMERIK 800 series CNC systems, specifically serving as a servo interface module. This module facilitates the connection of three axes with analog speed controllers and incremental position encoders to the SINUMERIK 800 control system, enabling precise motion control in industrial automation applications. Key features include: Actual position generation with four-fold pulse multiplication, Analog set value output with a range of ±10 V and a resolution of 1.2 mV, Servo enable with a 24 V control output capable of 100 mA, Inputs for in-process measurement with axis-specific 24 V inputs and a bus test signal. The 6FX1-121-4BL02 module is integral to the SINUMERIK 880 GA2 system, providing essential functions for interfacing with analog speed controllers and position encoders. Its robust design ensures reliable performance in demanding industrial environments, making it a critical component for achieving high-precision motion control in CNC machinery.