Functional Safety over EtherCAT Controlled Safety Drive System

This reference design features a safety motor drive with a safety industrial network control. The safety network, Functional Safety over EtherCAT (FSoE), is one of the most well-known safety protocols in industrial systems. The design includes two independent RX72N 32-bit microcontrollers (MCUs), so if the system hits an unwanted state system, control is maintained, and it can safely cut power to the motor.

The safety data, such as the emergency stops, comes from the safety sensor or safety programmable logic controller (PLC) through the EtherCAT communication block. This safety data is checked by both RX72N MCUs individually and if either shows an "emergency situation," either one (or both) RX72N MCUs can cut off the motor power to avoid dangerous situations.

The safety control block consists of two RX72N MCUs, which manage motor emergency, stop control, and safety protocol data processing. According to the safety international standards (IEC 61508, ISO 13849-1), it is required to have redundancy in the system, which we achieve by having dual RX72N MCUs. Each RX72N MCU operates the same process and are able to check each other through the cross monitoring interface.

System Benefits

  • Renesas supports required software for the safety control block, such as self-test software and control software system (self-test software kit and SIL3 system software kit). By using these safety solutions, customers can shorten their development and certification time and reduce the costs.
  • By separating the safety functional block from the non-safety block (network device or motor control device), customers can easily design their applications.
  • Customers can select the best MCU for this safety system from our wide RX Family portfolio.
System Block Diagram

Functional Safety over EtherCAT Controlled Safety Drive System

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