F Oundation Fieldbus ™ Communication; Device Description And Methods; Node Address; F Oundation Fieldbus™ Function Blocks - Emerson Bettis Q Series Reference Manual

1.2 F Fieldbus
oundation
The Bettis Q-Series QC54 module uses the F
Fieldbus™ protocol to communicate with other
tion
field devices and the host system. F
bus™ is an all-digital, serial, two-way communica-
tion system, which interconnects field equipment
such as transmitters, valve controllers, and process
controllers. Field bus is a local-area network (LAN)
for devices used in both process and manufacturing
automation with built-in capability to distribute the
control application across the network.
The field bus environment is the base level group of
digital networks in the hierarchy of plant networks.
The field bus retains the desirable features of analog
systems such as:
 A standardized physical interface to the wire
 Bus-powered devices on a single wire pair
 Intrinsic safety options
In addition, use of F
OUNDATION
 Increased capabilities due to full digital communi-
cations
 Reduced wiring and wire terminations due to mul-
tiple devices on a single pair of wires
 Increased selection of suppliers due to interoper-
ability
 Reduced loading on control room equipment avail-
able by distributing control and input/output func-
tions to field devices
 Speed options for process control and manufactur-
ing applications
For more information on the operation of the F
Fieldbus™, refer to your DeltaV documentation
TION
and the F Fieldbus™ specifications.
OUNDATION
1.3 Device Description and Methods
This manual describes device setup using the Device
Descriptions (DD) specified by the F
bus™ protocol. Parameter access and methods are
also described in this manual. F
uses the DD, Function Blocks, and a Capabilities
File to achieve interoperability between the module
and field bus components from other manufactur-
ers in the control systems including hosts and other
devices. The DD provides information to describe
the data interface to the device while the Capabilities
File provides information about the device to enable
the creation of a control strategy without a physical
device (off-line configuration).
Page 6
Reference manual F
Communication
™
-
ounda
Field-
oundation
Fieldbus™ enables:
OUNDA-
Field-
OUNDATION
Fieldbus™
OUNDATION
Fieldbus Control module
OUNDATION
For field bus devices, in addition to providing param-
eter definitions and other information required by the
control system to communicate with the device, the
DD may also include methods. Methods can be used
for a variety of functions including remote restarting
of the control module. Methods are a predetermined
sequence of steps using a structured programming
language and the interface definition for the module.
How the method prompts and how messages appear
is determined by the host system. For information on
using methods on the host system, see Appendix E
and the appropriate host system documentation.
1.4

Node Address

The default node address of the Bettis Q-Series
QC54 module is 247 (status = standby).
Use the host system to commission the module and
assign it a working address. For information on using
the host system for device commissioning and as-
signing addresses, see the appropriate host system
documentation.
1.5 F Fieldbus™ function
oundation
blocks
Function blocks, within a field bus device, perform the
various functions required for process control, such
as process variable input, output, and control func-
tions such as Proportional/Integral/Derivative (PID)
functions. The standard function blocks provide a
common structure for defining function block inputs,
outputs, control parameters, events, alarms, and
modes. Then, function blocks can be combined into
a process that can be implemented within a single
device or in multiple devices via the field bus network.
The following function blocks are implemented in the
Bettis Q-Series module.
 Resource Block (RB)
 Transducer Block (TB)
 Analog Input (AI) Function Block
 Discrete Output (DO) Function Block
 2x Discrete Input (DI) Function Block
 PID Function Block
Function Block parameters and usage is described in
the host system documentation. Please refer to this
documentation for detailed information on function
blocks.
DOC.RM.BQC54.E Rev: 1
February, 2016