Hey guys I've got a bit of a question.
We've recently had an engineer review our plant and they have decided we need a SIS plc. As I'm not familiar with safety plcs the engineering company is designing one for us.
The thing I am a little curious about is they have specified they are going to use a 1756 guardlogix controller and safety partner but they plan to use normal controllogix 1756 i/o for the SIS. Is there any reason for this? It just seems to be a bit strange not to use safety rated I/O. As far as I know they haven't got provisions for 1oo2, but I'm not sure what SIL they are trying to achieve.
I could be wrong but it seems like overkill to use a safety controller on a system like this. When the rest won't be properly SIL rated.
Any thoughts would be appreciated as I try and wrap my head around this concept
We've recently had an engineer review our plant and they have decided we need a SIS plc. As I'm not familiar with safety plcs the engineering company is designing one for us.
The thing I am a little curious about is they have specified they are going to use a 1756 guardlogix controller and safety partner but they plan to use normal controllogix 1756 i/o for the SIS. Is there any reason for this? It just seems to be a bit strange not to use safety rated I/O. As far as I know they haven't got provisions for 1oo2, but I'm not sure what SIL they are trying to achieve.
I could be wrong but it seems like overkill to use a safety controller on a system like this. When the rest won't be properly SIL rated.
Any thoughts would be appreciated as I try and wrap my head around this concept