The 6ES7517-4HQ10-0AB0 is a redundant CPU. It belongs to the SIMATIC S7-1500H series. It is the CPU 1517H-4 PN unit. It is a high availability controller. It is built for redundant systems. It supports S7-1500H CPU pairing. It keeps running during one failure. It enables bumpless system switching. It provides integrated redundancy.

