K-WANG
GENERAL
PAC8000 I/O is a completely modular I/O
solution for both general purpose and
hazardous area applications. Based upon
a carrier system that supports a range of
modules, it offers a wide variety of I/O functions, including AC mains and intrinsic safety
signals - even within the same node. It has an
“open” architecture that allows communication with a variety of different field-buses by
selecting the appropriate type of Bus Interface Module (BIM) or Controller.
GE FANUC PAC8000 Modular I/O
I/O Modules
I/O modules transfer signals to and from field
instruments. Input modules receive signals
from transmitters and sensors and convert
them into a digital form for presentation to
the BIM or Controller. Output modules receive
commands from the BIM or Controller and
transfer them to actuators. A wide range
of modules is available, including types for
low-level instrumentation, AC mains and
intrinsically safe signals. I/O modules can
have 4. 8. 16. or 32 field channels.
Field terminals
Field terminals provide the interface between
the I/O modules and the field wiring. They
include fusing and loop disconnect as options.
A mechanical keying system helps prevent
an I/O module from being connected to the
wrong type of field terminal. Field terminals
mount onto the module carrier, one to each
I/O module. They are clamped firmly by the
I/O module to form an electrical and mechanical assembly of high integrity. They may be
replaced in service without removing carriers
or disturbing the operation of other modules.
Carriers
Carriers form PAC8000’s physical and electrical backbone by providing a mounting
onto a flat panel or T- or G-section DIN rail.
They support and interconnect the BIM or
Controller, power supplies, I/O modules and
field terminals, and carry the address, data
and power lines of the internal Railbus.
They provide a termination points for the
LAN and field wiring cable screens and can
also distribute bussed field power to the I/O
modules. I/O module carriers are available to
support four or eight I/O modules.
Power supplies
Good power management lies at the heart
of a true distributed I/O system. 8000 power
supplies accept locally available unregulated
power and provide a regulated supply for the
BIM or Controller and I/O modules. Supply
redundancy is supported.
Bus Interface Module (BIM)
The BIM provides a serial data connection
to a host controller, which could be a distributed control system (DCS), a programmable
logic controller (PLC), or a PC running a soft
control package. A choice of BIMs allows you
to accommodate the most popular fieldbus
protocols. The BIM also uses a fast internal
bus to pass data to, and obtain data from,
the I/O modules. Only one BIM is required at
each node to control up to 64 I/O modules.
Controllers
Controllers are an alternative to BIMs - and
are used where distributed control is required,
rather than distributed IO. A number of
different Controllers are available which
are suited to particular applications. The
Logic Controller runs applications based on
IEC61131 languages, the Process Controller
has a control package that uses DCS-style
function blocks and the Hybrid Controller can
run both application packages in a single unit.
The SafetyNet Controller is SIL 2 compliant
for emergency shut-down and fre and gas
applications. The RTU Controller runs IEC61131
application programmes and supports DNP3
communication protocol.
“HART-ability”
The use of ‘smart’ instruments on process
plants is growing but this investment is not
always fully exploited. Whether it is for a new
installation, or the upgrade of an existing
one, we have solutions that provide the
connections between the HART field instruments, the control systems and the asset
management software.
Specifically, the PAC8000 Process I/O system
has been designed to be transparent to
HART signals, thus allowing the host control
software and any HART field instruments to
communicate directly with each other.
In addition, PAC8000’s HART connections
8000 in your system
Figure 1 shows two possible methods for
linking the 8000 into a system. On the left is
a host controller system that uses fieldbus as
the main distribution medium. On the right
is a section of a typical DCS/PLC information network, with an operator station that
uses a separate interface to the process
fieldbus. The number of 8000 nodes that
can be accommodated depends upon the
addressing capability of the fieldbus in use.
Each 8000 node can address 32 I/O modules
which, depending upon the number of channels per module, can provide up to 512 I/O
points at a single node! A node can consist
of a mixture of analog and discrete modules
and this gives maximum flexibility to the
system designer. Where supported by the
fieldbus, full HART pass-through is provided—
the 8000 appears “transparent”, allowing the
host controller to access the HART capabilities of field instruments.
Wide choice of fieldbus options
F8000 supports a number of popular fieldbus
protocols: Modbus® (RTU mode), Profibus–DP,
eDNP3 and Modbus TCP over Ethernet.
Redundancy options
8000 has been designed to increase availability and minimise downtime. Redundant
LAN channels and power supplies can be
specified as options to increase system availability. All Controllers can be used in redundant
configurations, as can the 8507-BI-DP BIM for
Profibus DP remote IO. Possible downtime is
further reduced by ensuring that the system
components using active circuitry can be
removed and replaced quickly and easily. Even
the field terminals can be replaced without
interrupting the operation of adjacent I/O
modules. Carriers have no active circuitry and
are unlikely to need replacement.
System power supplies
The system power supply at an 8000 node
converts the local DC supply to power the
node and can also provide field power for
I/O modules with low-level field circuits.
Where heavy-current or AC mains circuits
are handled by the I/O modules, 8000’s
innovative Buss
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