When to Use AC500 High Availability CS31 System?

Centralized and particularly important system components require greater levels of availability. To keep the control sequences operational in the event of a failure, the mechanism of HA-CS31 system automatically switches over to the redundant backup system.

HA-CS31 system can be used in any situation in which system components require greater levels of availability by redundancy and automatic switch over, where a brief freeze of the system can be tolerated by the process while switching from one station to another. See Functionality.

AC500 HA system can be used to manage the following types of failure:

• Failure of CPU components:
  • Failure of the power supply unit
  • Failure of the terminal base of the CPU
  • Failure of the CS31 master
  • CPU failure due to hardware or software faults
• Failure of field device connection:
  • Breaks/short circuit in the bus cable for the data link or CS31 slave interface faults on CI590-CS31-HA module
• Failure of HMI connection (if using HMI and switches):
  • Switch
  • Connection between CPU and switch
  • Connection between switch and HMI