Failsafe vs H-Redundant

KKDAS2012

Dear Friends,

Can anyonne provide me the proper difference explanation between a Failsafe CPU and H-Redundant CPU;

I've worked on all sorts of S7-400H CPU's so I've clear idea on H-redundant systems; but when asked about Failsafe CPU's at onsite I was sparkled.

Further problem came when site persons are asking for S7-300H systems? When searched the portal I got the references on S7-300F systems rather than S7-300H ones'.

Kindly help me on this sort of issue.

With Regards

KK

1. From H CPUs point of view , it can be used as an FH configuration with safety I/O modules , a hard copy of the run-time license plus a proper engineering software platform. F-Systems and the corresponding hardware and embedded library is suitable for process automation.Please read more here(SIMATIC Industrial Software Safety Engineering in SIMATIC S7)
   
   
2. There is no hardware redundant system for S7-300 (like S7-300H), a software solution is provided to make standard CPUs as fault-tolerant while limitation such as switch-over time should be considered.(SIMATIC S7-300/S7-400 Software redundancy for SIMATIC S7)
   
   
3. S7-300F is a solution for safety-related applications in factory automation.Please read "1.3 Fail-safe Systems in SIMATIC S7" of (SIMATIC Industrial Software Safety Engineering in SIMATIC S7)

Finally, I want to add a great discussion on a similar topic for more references:Can we use Fail Safe System(S7400FH) as a Fault Tolerant(S7400H) System

I hope this helps,

Hamid Hosseini