TM
Page 6
Reference manual Foundation Fieldbus Control module
DOC.RM.QC34.E Rev: A
October, 2006
1.2 F
OUNDATION Fieldbus
™
Communication
without a physical device (off-line configuration).
For fieldbus 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 FieldQ QC34
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
assigning addresses, see the appropriate host
system documentation.
1.5 FOUNDATION Fieldbus™ function blocks
Function blocks, within a fieldbus 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 fieldbus network.
The following function blocks are implemented in the
FieldQ module.
y Resource Block (RB)
y Transducer Block (TB)
y Analog Input (AI) Function Block
y Discrete Output (DO) Function Block
y 2x Discrete Input (DI) Function Block
y 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.
The FieldQ QC34 module uses the FOUNDATION
Fieldbus
™
protocol to communicate with other field
devices and the host system. FOUNDATION
Field-
bus™ is an all-digital, serial, two-way communication
system, which interconnects field equipment such as
transmitters, valve controllers, and process control-
lers. Fieldbus 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 fieldbus environment is the base level group of
digital networks in the hierarchy of plant networks.
The fieldbus retains the desirable features of analog
systems such as:
y A standardized physical interface to the wire
y Bus-powered devices on a single wire pair
y Intrinsic safety options
In addition, use of FOUNDATION
Fieldbus™ enables:
y Increased capabilities due to full digital communi-
cations
y Reduced wiring and wire terminations due to
multiple devices on a single pair of wires
y Increased selection of suppliers due to
interoperability
y Reduced loading on control room equipment
available by distributing control and input/output
functions to field devices
y Speed options for process control and manufactur-
ing applications
For more information on the operation of the FOUNDA-
TION
Fieldbus™, refer to your DeltaV documentation
and the FOUNDATION
Fieldbus™ specifications.
1.3 Device Description and Methods
This manual describes device setup using the Device
Descriptions (DD) specified by the FOUNDATION
Fieldbus™ protocol. Parameter access and methods
are also described in this manual. FOUNDATION
Fieldbus™ uses the DD, Function Blocks, and a
Capabilities File to achieve interoperability between
the module and fieldbus components from other
manufacturers 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
