Last month, Siemens Energy and Automation released a new safety I/O card that claims to be the first Hart, Analog input, SIL 3 http://www2.sea.siemens.com/News/Industrial/First-SIL-3-Certified-Hart-Analog-Input-Module.htm While some may find this as a break thru, it’s what I view as a direction of the industry.  Siemens and other ...