hi all,

For the critical redundant signals as a general industrial practise it will be configured in different I/O cards in case even one set of I/O card failure the other set of I/O cards retain the signal. Now my question, is there any international standard associated with this requirement?

Please let me know,

with best regards,
sanand

 

Most plant configurations would depend on the safety assement and the decisions that the engineers would take to satisfy the requirements of the HAZOP and CHAZOP. (Safety Review & Control System Operability Review) Some good sources for data on these would be. Safety Instrumented System standards (e.g., ANSI/ISA 84, IEC 61508 & 61511. You can also google "SIL levels" for some good data. Hope this helps

Steve Linehan.