SIL3 Online Data Change
I' ve Hıgh Integrıty ( SIL3 ) logics for example analog, valve vs.. I want to change datas when the program is online mode? If I configure datas according to the SIL rules is it possible to control signals without using SCADA or Faceplate?
It is not possible to change the datain online mode for SIL applications. Confirm Write protocol is needed to write to variables and parameters belongs to a SIL Application.
800xA Operator Workplace (Faceplace etc.) supports the "Confirmed Write" protocol and can also be used for modifying variables in AC 800m HI.
Source: 3BNP004865-516 RevA
Hi, Ideally we should change the SIL values from HMI. However, you have another method which I see some places they have used when people do not want values to be changed from HMI.
Use MMS or IAC communication from Non-SIL application to control your values in SIL applications. Non-SIL values can be changed in online, so no need of HMI. However, I hope you are aware of taking a risk of passing values from Non-SIL to SIL application considering the fail safe values in case of communication loss.