PLC SIL Definition

[automation99]

AB ControlLogix 1756 is rated for SIL 2, does it mean I will get SIL 2 in any kind of configuation, or I have to be careful select components of controlLogix to make it SIL 2, such as redundant CPU, redundant network? To what level of redundancy I need to make it SIL 2?

Thanks in advance.

 

[dogleg43]

I'm unable to help you, but what is a SIL rating?

 

[automation99]

SIL - Safety Integrity Level

 

[shayne31]

dogleg43,

SIL = Safety Integrity Level, check out this link for clarification (about 1/2 way down the page):

http://domino.automation.rockwell.c...5827ad9495bb2d00852568c1006af32e?OpenDocument

 

[sdl]

automation99:

In order to configure a programmable controller to meet a certain SIL, the manufacturer will have a safety manual. This manual will outline what is required to be completed in order to attain the SIL rating as tested.

A quick answer to your question is: no, only in specific configurations will you attain SIL2.

Also, be careful of processor to processor communications. If you are passing shutdown information over a communication network, that network shall be designed to the highest SIL required.

Hope this helps.

sdl