Product Description:

The Bosch Rexroth Indramat 109-0852-4B01-11 belongs to the VT-UK2 Universal Cards series and serves as a plug-in communication board for SERCOS-based motion systems. Installed in a controller rack, the card converts optical telegrams into electrical signals for axis electronics and returns status data to the master. This function places it between higher-level PLC logic and distributed servo drives, supporting deterministic data exchanges throughout coordinated motion sequences. Fiber-optic communication also prevents the electromagnetic interference commonly associated with copper communication cables in industrial automation equipment.

The board operates from a nominal supply of 24 VDC provided by the control cabinet bus. It remains functional at voltages as low as 18 VDC and tolerates surges up to 32 VDC. Within this voltage range, the electronics draw only 100 mA, which limits heat generation and simplifies power allocation inside compact enclosures. During periods of peak network traffic, the optical transceiver supports data rates up to 4 MBaud, allowing frequent position updates without timing jitter. Protective receivers distinguish logic-high states at 24 V from logic-low states that do not exceed 5.5 V. Input capacitances of 1 nF on channels E1, E2, E3, and E6 help suppress high-frequency noise, while capacitances of 22 pF on E4 and E5 preserve fast signal edges for synchronization events.

A default link speed of 2 MBaud is preset, allowing a SERCOS ring to begin operating before its communication rate is increased. The laser diode transmits frames at an optical power level of -4.5 dBm, providing sufficient signal strength for fiber runs in industrial machinery. The board includes six optically isolated digital inputs for local interlocks or sensor feedback, allowing process states to be incorporated into the control system. Light is coupled through an industrial FSMA connector that provides a secure fiber-optic connection in environments exposed to vibration. Input and output wiring terminates on a 9-pin screw clamp, providing secure connections for sensors, interlocks, or relays. The optical interface maintains electrical isolation between connected devices and supports dependable communication in areas with substantial electromagnetic noise.