Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 57)

Publication 1757-UM006A-EN-P - May 2002
Integrating Fieldbus into Rockwell Automation Logix System 2-13
The ProcessLogix data quality is converted to fieldbus data quality.
The ProcessLogix Good indication is represented as fieldbus
Good(Cascade).
The ProcessLogix limit indications of no-limit, limited-low,
limited-high, and constant are mapped to the same four indications for
fieldbus.
The ProcessLogix control initialization indicators map only to the
limited number of substatus conditions that have corresponding
indications in fieldbus Good(Cascade).
Fieldbus device Discrete Input integration
A user can functionally “wire” the output from a Discrete Input (DI)
function block in a fieldbus device residing on an H1 link to the input
of a Device Control (DEVCTL) function block or other block with a
digital input contained in a Control Module in the ProcessLogix
Control Builder application. The Fieldbus Library Manager (FLM) in
ProcessLogix R400.0 Control Builder makes this possible. The FLM
reads the manufacturer's DD for the fieldbus device and creates a
device template that is included in the Project tab of Control Builder.
The device template includes the device's fieldbus function blocks, so
it can be configured and integrated with control strategies through
Control Builder.
Figure 2.6 shows a simplified functional diagram of how the output
from an Discrete Input function block in a fieldbus compliant
transmitter is integrated with a Device Control (DEVCTL) function
block in a Control Module that is assigned and loaded to the CEE in
the Control Processor Module (CPM).