Software Architecture; Communications Architecture - GE Multilin G650 Manual

1 GETTING STARTED
The firmware (software embedded in the relay) has been designed using object oriented programming techniques (OOP).
These techniques are based on the use of objects and classes, and provide the software architecture with the same
characteristics as the hardware architecture, i.e., modularity, scalability and flexibility.
The main processor performs protection, control, and communication functions, incorporating two internal processors, one
for generic use and a second one dedicated for communications.
A dedicated serial port is used for communication between the main processor and the human-machine interface. The
serial connection provides great immunity against electromagnetic disturbances, thus increasing system safety.
All G650 units incorporate an RS232 serial port on the front of the relay. There is also a possibility to incorporate up to two
additional communication modules on the rear.
One of the modules provides asynchronous serial communications, using different physical media (RS485, plastic or glass
fiber optic) depending on the selected model. The module incorporates two identical ports, COM1 and COM2. The COM2
port is multiplexed with the front port. Additionally, this module may incorporate a port for CAN BUS communications, used
for the connection to the Remote CAN BUS I/O module. This feature allows increasing up to 100% the I/O capability, when
the maximum number of I/Os available inside the relay is not enough for a specific application.
Available options are:
Table 1–1: REAR SERIAL COMMUNICATIONS BOARD 1
BOARD CODE FUNCTIONALITY
F Without additional communication ports
A Two RS485 ports
P Two Plastic F.O. ports
G Two Glass F.O. ports
X Two RS485 ports and a CAN port for remote CAN Bus Inputs/Outputs
Y Two Plastic F.O. ports and a CAN port for remote CAN Bus Inputs/Outputs (fiber)
Z Two Glass F.O. ports and a CAN port for remote CAN Bus Inputs/Outputs (fiber)
C CAN port for remote CAN Bus I/O (cable)
M RS485 CAN port for remote CAN bus I/O (cable)
The other module provides Ethernet communications (COM3 port), using 10/100BaseTX (self-negotiable speed) or
100BaseFX connectors, depending on the selected model. The most complete models include a double redundant
100BaseFX fiber optic port. Redundancy is provided at the physical level; the unit incorporates internally duplicated and
independent controllers for extended system reliability and accessibility.
Available Options are:
Table 1–2: REAR ETHERNET COMMUNICATIONS BOARD 2
BOARD CODE FUNCTIONALITY
B One 10/100BaseTX port (self-negotiable speed)
C One 10/100BaseTX port and one 100BaseFX port.
D One 10/100BaseTX port and redundant 100BaseFX ports
E Redundant 10/100BaseTX ports
For options C and D it is required to select the active physical media, by means of an internal selector inside the module.
The factory configuration for this selection is the 10/100BaseTX port.
Finally, internal communication with input and output modules is performed via an internal CAN bus, independent from the
one used for remote CAN BUS I/Os. This fact provides increased communication speed, as well as the possibility of
acknowledgement of modules, abnormalities, etc. As this is a serial port supporting a communications protocol, it provides
extraordinary immunity against external or internal disturbances.
GEK-113285A G650 Generator Protection & Control System
1.2 OVERVIEW

1.2.3 SOFTWARE ARCHITECTURE

1.2.4 COMMUNICATIONS ARCHITECTURE

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