The CANopen redundant rotary encoder features magnetic and photoelectric sampling systems with up to 30-bit multiturn resolution in one housing. Each system has its own microcontroller, compiler, and software module so they can operate independently, each with its own node ID in the CANopen system. This dual technology is known as diverse redundancy; it eliminates the possibility of common mode failure. There is no rechargeable battery; both systems can measure absolute position in de-energized mode. This CANopen redundant encoder is essentially two encoders in one housing, which are connected to the safety PLC via a single cable, making it easy to install and integrate into a safety system. The rotary encoder can be used with all accessories for 58 mm encoders—including mounting aids, couplings, measuring wheels, torque rests, as well as cable pulls and guide pulleys. The aluminum housing, the solid or recessed hollow shaft made of stainless steel, the degree of protection up to IP67, the temperature range from -40 °C to +85 °C, and the axial and radial shaft load of 40 N and 110 N respectively enable use under harsh conditions.