redundancy in s7-400 using cpu 412-5H

[ddhope]

how is redundancy accomplished using the above configuration? If the outputs are taken from both modules,wont they get added up?how does error detection take place?

 

[KalleOlsen]

Check this link first.

 

[ddhope]

Check this link first.

hello.. I have already checked the system manual and the explanation is not clear enough to me.It has been explained with reference to digital output eg. to an HMI , i want to be clear as to how it works for analog outputs eg. to a valve.

 

[KalleOlsen]

hello.. I have already checked the system manual and the explanation is not clear enough to me.It has been explained with reference to digital output eg. to an HMI , i want to be clear as to how it works for analog outputs eg. to a valve.

If you read thoroughly you will see that one CPU is master and the other is (hot) standby. The master controls the outputs, dig. and ana., and the standby CPU gets updated process info via the h-link. If the master kneels, the changeover happens within 100ms.

Check tech info and the brochure. More pictures, less reading.

Kalle

 

[seppoalanen]

http://www.kolumbus.fi/sepala/Construction lo41x101.htm

In this case I/O works with doubled Profibus.
CP443 units are in both CPU-Racks with different IP-addresses.
WinCC HMI recognises who IP: is in Master CPU with "Siemens" Eth-unit.