Print document

Technical Forum

SIMATIC S7-400 / S7-400H / S7-400F /FH

Fail safe CPU- Fail safe state ?

Thread Starter: sunn7   Started: 6/14/2012 2:56 PM   Replies: 1

« Previous thread Next thread »
Page 1 of 1 (2 items)
  6/14/2012, 2:56 PM
sunn7
Joined 2/1/2008
Last visit: 3/15/2013
Posts: 153
Rating:
Rated: Good [1 out of 5 / rated 1 time(s)]. (1) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Hello all

I read some documents about Fail safe CPU. and I undrstand in case of any fail ( is it short crcuit and wire break) in loop, CPU will go to fail state. what is the fail state? 

now i want to know where we define this fail state?

is it inside programming ?

thank you for ur time

sun



=== Edited by sunn7 @ 6/18/2012 2:26 PM [GMT ] ===
Top
  6/21/2012, 10:16 AM
sunn7
Joined 2/1/2008
Last visit: 3/15/2013
Posts: 153
Rating:
Rated: Good [1 out of 5 / rated 1 time(s)]. (1) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Hi all

I will elobrate little bit of my question,

For SAFETY PLC where we define the which SAFE state it has attain?

I mean what exactly happens when SAFTEY PLC finds the input circuit is faulty?

with example, for some valves OPEN state is FAIL SAFE, for some it is CLOSE. in case of MCC contacts OPEN contact.

so these state to be defined in the SAFETY Program??


Thanks
sunn7

-----------

I think this is stupid question probably? Rnf:lblSmileyTooltip_ think 



=== Edited by sunn7 @ 6/22/2012 7:01 AM [GMT ] ===
Top
Page 1 of 1 (2 items)
Actions
Copy Link
To conference