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What is the difference between Modicon Quantum Summable and Redundant plc rack power supplies

The Quantum redundant power supplies also contain circuitry which forces the installed power supplies to share output current almost equally. An important difference between the summable and the redundant supply lies in the system POK generation circuitry.
The Quantum system POK signal in systems powered by redundant power supplies is true (power is OK) if either or both internal POK is true. 

Another important difference from the summable system is the total available system rack loading. If there are N redundant power supplies installed in a rack, the total rack load must not exceed the capability of N-1 supplies. (Nmax=3).
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