D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
24
Full
Familiarization, continued
D20ME Main
Module
The D20ME is the:
• Main module of the D20/D200. It functions as a data concentrator and central
processor of field data, and
• Acts as a master controller over other D20 peripheral I/O modules, which act as
slaves.
The D20 I/O peripheral modules perform the primary processing of data. This
increases the speed and efficiency of the D20 by reducing the workload on the main
processor.
D20ME: Four
Versions
• The D20ME non-VME is designed for use in single-processor D20 devices
• The D20ME VME is designed to fit in a standard D20 or D200 VME chassis and
has access to:
− External global memory
− VME-based peripherals, such as Ethernet cards
• The D20ME II is available in VME and non-VME versions. It is functionally
identical to the D20ME; however, it has the added capability to select, on a per-
channel basis, RS-232 or RS-485 interfacing.
Table
The following table lists D20ME/ME II part numbers and typical applications.
Board Type Part # Description
D20ME 526-2004 D20ME module suitable for non-VME D20 (single
processor) applications.
D20ME – VME 526-2005 D20ME module suitable for VME D20 and D200
applications requiring multiple processors and/or
Ethernet support.
D20ME II (non VME) 526-2006 D20ME II module, supporting RS-232 and RS-485
interfaces, suitable for non-VME (single processor)
applications.
D20ME II (VME) 526-2007 D20ME II module, supporting RS-232 and RS-485
interfaces, suitable for VME D20 and D200
applications requiring multiple processors and/or
Ethernet support.
Note
All D20ME module types can be used with D20 Base firmware or CCU Base
firmware.
You must select which base system to use when choosing the module type in Config
Pro.
LED Indicators
See “Operations: D20ME/ME II Main Board” on page 115 for information about
LED indicators.
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