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GE 8522-EB-MT Ethernet Bus Interface

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 Bussed Field Power scheme for

distributing field power avoids complex

wiring at the field terminal and minimizes the

backplane/carrier wiring.

Hazardous area applications

The 8000 is a truly field mountable system

even in areas where flammable gases are

present. It is available in versions to suit

different area classification schemes:

a) Reduced commissioning time and cost

b) Reduced process downtime through status

monitoring

c) Lower loop maintenance costs by using

field device diagnostics

PAC8000 with general purpose field wiring

The PAC8000 2/2 IO module range is used

for general purpose and Zone 2 / Division

2 applications (where the node or the field

instrumentation are sited in the hazardous

area). See Figure 2. PAC8000 supports a full

range of I/O module types covering inputs

and outputs for both analog and discrete

circuits. The node can be mounted on the

plant with a suitable enclosure providing

protection against the environment. Figure 3

shows a node containing all the key compo nents: a Bus Interface Module or Controller,

I/O modules on carriers and a pair of carrier extenders linked with an extension cable.

Power supplies are not shown, but arrows

indicated the location of the BFP connectors.

PAC8000 with intrinsic safety field wiring

The PAC8000 Process I/O System is capable

of supporting I/O modules with intrinsic safety

(IS) field wiring, for connection to certified or

‘simple apparatus’ field devices in Division 1

or Zone 0 hazardous areas (see Figures 2 and

4). A range of I/O module types with IS field

circuits for industry standard DI, DO, AI and

AO applications is supported. (Note, there is

no concept of Bussed Field Power with 2/1

IO modules, all field power is sourced from

internal power supply connections, via the IO

module power supply, see below).

I/O modules with built-in protection

All voltage and current-limiting components

required for IS protection are incorporated

within the I/O module housings, so no

external, add-on zener barriers or galvanic

isolators are necessary. IS field terminals

are distinguished from other types by blue

coloring of the housing. A unique and sophis ticated mechanical keying mechanism helps

to prevent modules with different protection

techniques from being interchanged, so that

potentially explosive or damaging conditions

cannot occur.

Integrated power supplies

Power for IS I/O modules is derived from

integrated, modular power supply units. Each

power unit is capable of supplying between

eight and twenty I/O modules, depending on

the I/O type and mix. Optional power supply

redundancy is supported by means of an

additional, redundant supply unit connected

in an ‘n+1’ arrangement. In applications with

mixed IS and non-IS field wiring, the full facili ties of the ‘Bussed Field Power’ regime are

retained for the non-IS part of the system.

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