Honeywell Series A - 3.2 Control Integration

3. Fieldbus Integration With Experion System
3.2. Control Integration
42 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
3.2 Control Integration
FIM handles data integration
The Fieldbus Interface Module functions as a dual network bridge using a dynamic data
cache to facilitate the exchange of data between the control communication network and
the fieldbus H1 links. It supports both publish/subscribe and client/server
communications methods to implement control connections between Control Builder
function blocks and fieldbus function blocks. FIM capability includes converting Control
Builder value-status structure to fieldbus value-status by mapping similar fields to one
another and defaulting others. This means the Experion system can monitor fieldbus
control functions, fully integrate with control functions, or provide a combination that
includes using fieldbus based control as backup for selected Experion system control
functions.
The FIM uses low and high priority send queues to make sure that publish/subscribe data
normally used for control is processed before less important display access data.
Publish/subscribe requests are placed in the high priority send queue and client/server
requests are placed in the low one.
About link object
The l
ink object represents one fieldbus H1 link. It consists of Network Management and
System Management information, along with several application parameters related to
link functions such as startup, shutdown, and diagnostics.
Network Management description
Netwo
rk Management provides the following capabilities for managing the
communication system of a fieldbus device.
Loading a Virtual Communication Relationship (VCR) list or single entries in this
list, (A VCR represents a communication channel through the complete
communication stack.)
Configuring the communication stack;
Loading the Link Schedule;
Monitoring performance; and
Monitoring fault detection.
The collection of managed variables is called the Network Management Information
Base (NMIB).