Leuze electronic CDV75M and CDH75M safe rotary encoders

The CDV75M and CDH75M safe rotary encoders can now be used directly with safety-oriented EtherCAT networks, as they support the Functional Safety over EtherCAT (FSoE) protocol and transmit safe speed and safe position values.

The measured values are acquired by two independent scanning units, with reliability ensured by a cross comparison of the data. The rotary encoders are certified and can be used in safety functions where safety levels of SIL3 or PLe are mandated.

Safety is integrated directly into the rotary encoder; no further evaluation units or safety modules are required. This means a considerable reduction in wiring and configuration is accomplished. During configuration, parameters such as difference and standstill window, and direction of rotation or integration time, are set directly via the safe parameterisation channels per the FSoE protocol.

During standstill, the rotary encoder output value can be moved to within the measuring range by means of a safe protocol, without mechanically turning the shaft. This simplifies adaptation of the mechanical system. At the same time, position and speed can also be read out via non-safe, or ‘normal’, EtherCAT protocol. The position values are therefore also available for quick position control outside the secure data range.

Safety over EtherCAT enables new system layouts including cooperative workstations, where operator and machine can share the same workspace efficiently and safely.