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Can Unity Quantum Hot Standby run without RIO?

Published date: 27 August 2019

Issue
Can not get the Unity Quantum Hot Standby Controllers to go Run Primary / Standby without RIO Drops.

Product line
Unity Quantum, Modicon Quantum

Resolution
Unity Quantum Hot Standby can be run without RIO drops but the following conditions must be met.
  • A healthy CRP must reside in each backplane and they must be linked to each other so that they can communicate directly.
  • No RIO drops can be mapped in the configuration ***
  • If firmware 2.xx is selected in the program, then 'No RIO drop' must be selected in the Hot Standby tab.
*** System bits %S83 and %S84 can be used to allow missing configured EIO drops.

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