Siemens 6ES7517-3HP00-0AB0 SIMATIC S7-1500H CPU 1517H-3 PN 2MB/8MB Redundant Programmable Logic Controller

The Siemens 6ES7517-3HP00-0AB0 CPU 1517H-3 PN is a high-availability central processing unit from the SIMATIC S7-1500H line, built to run as one half of a redundant pair synchronized over H-Sync fiber-optic links. It holds 2 MB of program memory and 8 MB of data memory, with two PROFINET interfaces plus dedicated 3rd/4th H-Sync ports for the redundancy link.

Technical Specifications

Selection Notes

H marks this as a redundancy CPU: it must be paired with a second 1517H-3 PN over the 3rd/4th H-Sync interfaces so the standby unit takes over the process image on a switchover, which the F and standard CPUs in this range cannot do. Choose the F-3 PN/DP CPU instead if the requirement is safety logic rather than hot-standby availability, since the H-CPU carries no F-block support. Two PROFINET IO controllers plus S2/R1 system redundancy and MRP media redundancy make this pairing suited to processes where an unplanned CPU stop cannot be tolerated, such as continuous production lines.