No custom code is required to implement common SIS tasks with the IEC 61508 certified function blocks, providing faster configuration and troubleshooting of SIS logic. Standard operator faceplates automatically provide detailed safety information with no configuration. Using these function blocks can help eliminate engineering hours previously needed to implement ESD, FGS, and BMS applications. The certified function blocks deliver powerful functionality out of the box, simplifying the implementation of complex SIS applications.
The DeltaV SIS™ process safety system includes TÜV-certified function blocks designed specifically for safety loops. These out-of-the-box function blocks reduce what used to be pages and pages of ladder logic or custom programming to engineer, test, and commission into a simple drag-and-drop configuration activity. Included in the safety palette are: sequence of events, voters, cause and effect, state transition and step sequencer function blocks. Using standard function blocks instead of custom programming makes it easy for engineers to troubleshoot and maintain logic, even if they did not create it.
Input processing provides status handling with no need for custom code and different options are available. For example, voter blocks can automatically degrade voting when an input value is bad. With integrated HART I/O, device diagnostic information is automatically presented to the operator without mapping data tags or creating custom templates or faceplates.
The DeltaV SIS function blocks include many features that make them useable as-is. Standard faceplates are included for most function blocks make configuring operator graphics easy. For proof testing or other maintenance needs, bypasses are available within the function blocks. The sequence of events block includes automatic first-out trapping, which reduces testing time and simplifies maintenance. Alarm management per EEMUA 191 is provided.
