The CSH01.1C-S3-ENS-NNN-NNN-S2-S-NN-FW belongs to the CSH Advanced Controllers series produced by Bosch Rexroth Indramat. It serves as a motion and I/O expansion controller for SERCOS-based drive packages, allowing axis commands, analog feedback, and safety signals to converge in one compact module. Within an automation cell, the unit converts field-level data into deterministic instructions for servo inverters and relays, so it functions as an interface between higher-level PLCs and drive hardware. It can also collect local machine signals and pass time-sensitive commands to the drive network with predictable timing.

The controller operates from a DC 24 V control supply and draws only 7.5 W, which helps keep cabinet heat generation low. Communication with drives uses SERCOS III over an RJ-45 port based on the IEEE 802.3 Ethernet standard. Two differential analog inputs present a typical impedance of 160 kΩ. The pair of analog outputs provide 0 to 5 V at 1 mA with a minimum load of 5 kΩ and an output resolution of 8 bit. Four configurable digital channels accept 24 V signals at 3 mA or can source 24 V at 0.5 A, letting the board read sensors or switch small actuators without additional cards. The inrush current during power-up is limited to 4 A for 100 ms, so the control supply is not subjected to a large startup surge.

For cyclic motion loops, the SERCOS interface reaches a minimum network period of 250 µs. Position feedback devices receive a regulated 11.6 V DC rail rated at 300 mA through the ENS header, eliminating the need for an external encoder supply. A form-C relay rated at 24 V DC, 1 A handles field contact tasks such as drive enable. Additional connections include a D-Sub 9-pin female safety plug and an RS232 serial port for service access. The available ports separate safety, serial, and network functions so external wiring can be organized by signal type.