CP451-50 S2  Sequence of Events Manager (SEM)

This GS (General Specifications) describes the specifications of the Sequence of Events Manager (SEM). The SEM
captures, records and displays in chronological order the sequence of events (SOE) prior to and during a plant trip.
The SEM provides a means of recording activities leading to a potential plant upset or trip.
The SEM offers the following benefits:
• High-speed capturing of events with one millisecond time stamp resolution
• SOE inputs available for use as control and or monitoring signals
• Accurate system time synchronization across a Vnet/IP system without additional hardware
• Time synchronization with Simple Network Time Protocol (SNTP) server (Option)
• Trip Report for a specified time period upon occurrence of user defined triggers
• Long-term data storage and automatic trip report generation
• SOE data output to OPC clients (e.g. Exaquantum)
• SOE viewing and reporting at multiple Human Interface Stations (HIS) and/or any other PCs via Ethernet
• SOE viewing and reporting that integrate SOE messages with process alarms and other process related events

CP451-50

The SEM is designed to capture the events using SOE
digital input modules (ADV151-E) and High Speed
protection modules (AGP813-S). These modules
apply time stamp and send the SOE data from the
Field Control Station to the SOE Server via Vnet/IP. An
open communication bus of Vnet/IP is used for SOE
data transmission. The SOE data is sent to the SOE
Server, stored in the SOE Server and displayed in
chronological order on the SOE Viewer screen. As the
SEM employs a Server/Client (Viewer) architecture,
the SOE data stored in the SOE Server can be easily
accessed from multiple HISs and/or any other PCs
via Vnet/IP. The SEM consists of the following system
components with the appropriate SEM software.