8421-CC-PS GE Gas turbine card control system communication

8421-CC-PS GE Gas turbine card control system communication

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An 8000 Series node comprises single or redundant

Ethernet Bus Inter-face Modules, up to 64 I/O modules,

field terminals, and associated power supplies.

A schematic node architecture is shown below. Information from the I/O modules is transferred to and

from the communication module (EBIM) via the Railbus. The Railbus is a fast, serial data bus with parallel

module addressing and extends over the full length of

the node. The parallel address architecture means that

each I/O module position has a unique address which

eliminates the need to ‘train’ modules during installation.

Power for the node is provided by integrated power

supply modules; these convert the locally available

power source into a regulated internal supply rail. This

rail energizes the EBIM and all Railbus communication

between the EBIM and I/O modules.

For some I/O module types—such as those with

low-power and intrinsically safe field circuits—it also

provides power for the field wiring. Where additional

power is required for field devices (such as high current AC circuits), power can be provided by means

of cabled connections from each module to external

relays. This Bussed Field Power facility reduces installation time by removing the need to make daisy chain

wiring connections at the field terminals of each I/O

module