I have worked on the LOGIC solvers, but I am designing SIS CHARMS for first time. I have few questions:
1. As controllers just act as communication gateway, we used to have PCS controller to communicate the SIS to HMI layer. but I can see SIS electronic Marshaling has separate SZ controller. so can we still combine the controllers? i.e use same controller for process and safety?
2. cant we use SX controller with SIS electronic Marshaling? OR can SZ controller still execute PCS logic, so we can use just SZ controller and doesn';t required separate controller for PCS.
3. generally, for Fire and Gas system, is it recommended to have separate SZ controller than ESD system? as controllers are not executing any logic, I assume we can have one controller for ESD and FGS ( both having safety CHARMS). please confirm ( they all will eb on same LSN network, in this case).
4. for FGS line monitoring is usually required, so how can we implement this using SIS charms?
Imran Tahir
Lead Engineer, Solution Center
INTECH Process Automation Inc.
www.intechww.com
Hi Imran,
Answering your questions:
1. First thing you shall know, is the SZ is not the Logic Solver, thus, no safety logic is allowed to run at the SZ, all the safety logic will be assigned to the CSLS on the SIS Electronic Marshalling architecture. The main function of the SZ controller is to integrate the Local Safety Network to the DeltaV Control Network, featuring as a firewall, you can have as much as 16 CSLSs assigned to each LSN. As a controller, the SZ also runs PCS logic, you can assign up to 4 CIOC, or 4 WIOC, or a mix of both, in oder to drive Non-SIS IO from the SZ controller. Other importante feature is, for StandAlone application, the SZ has a native Modbus TCP interface, allowing a very straightforward integration to 3rd part Systems.
2. As per previous answer, we can use the SZ to run PCS logic.
3. You can have up to 16 CSLS assigned to the LSN on a single SZ controller, so what you can do is separate the application by CSLS within the same LSN.
4. Our CHARMs have integrated diagnostic, HART for Analog channel, LM for Discrete Output, Short and Open Circuit for Discrete Input.
Hope it Helps!
Tadeu Batista