D20 Chassis (multiple-slot, VME)The VME version of the D20 chassis is equipped with five horizontal expansion slots for VME-compatible modules:
The VME version of the D20 chassis is equipped with a rear-mounted termination board for power connections and serial ports for one processor board. An optional rack-mounted serial port panel is available to support the seven serial ports on a second processor board.
The D20 hardware consists of a rack-mountable chassis containing one or more processor boards, power supplies and modems.
The D20 interfaces with substation equipment either through D.20 peripheral I/O modules, or directly through RS-232, RS-485, or Ethernet links.
The D20 can support up to:
• Two D.20 ports, each supporting up to 31 I/O peripherals, without repeaters, and
• 120 I/O D.20 peripherals, with repeaters
• 21 RS-232 or RS-485 ports (7 per processor board)
• Two Ethernet channels
D200 Chassis (multiple-slot, VME)
The D200 chassis is equipped with a rear-mounted termination board for power connections and serial-port access.
The D200 has the computing power and expandability needed to provide substation automation in larger substations. This is achieved through an innovative design that employs multiple D20 processors, communicating over a VME bus:
• RS-232/RS-485 ports support large numbers of host systems and IEDs
• VME bus architecture provides high scalability and performance for adding serial ports, LAN options, and memory
• Data is integrated and coordinated, so different applications access a single, real-time database
• Optional redundant configuration for high reliability at critical sites
• ironment, in accordance with applicable IEEE® and IEC® standards D200 hardware is similar in design to the D20 hardware, but it has significantly more physical capacity. Based on a 9-slot VME chassis, the D200 illustrated in figure 4 can support up to:
• 4 D.20 ports, each supporting up to 31 I/O peripherals, without repeaters,and 120 I/O peripherals, with repeaters
• 49 RS-232 or RS-485 ports (seven per D20ME or D20ME II Main Processor)
• Two Ethernet channels
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