Programming Best Practices

When you program a primary controller for redundancy or Logix SIS, it is essential to follow best practices that ensure system reliability, performance, and data integrity during normal operation and controller switchovers. Redundant architectures introduce unique considerations, such as synchronization between controllers, crossloading of data, and switchover behavior, that must be addressed in your logic design and configuration.

For general programming best practices, see the ControlLogix 5590 Controllers User Manual, publication 1756-UM900.