GE GFK-0787B Noise Reduction Machine User Manual


 
7
7-4 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Reserved References
In a GMR system, the following references are reserved or assigned special functions:
References Reserved For:
%I0001 to %I1024 (788 CPU)
%I00001 to %I12288 (789 CPU)
Input Table. Some references are automatically assigned by
the GMR Configuration Software. Others are available for
use, as explained in this chapter.
%Q0001 to %Q1024 (788 CPU)
%Q00001 to %Q12288 (789 CPU)
Output Table. Some references are automatically assigned by
the GMR Configuration Software. Others are available for
application use.
%AI0001 to %AI
max
The length of %AI data (shown at left as
max
) is configur-
able. Some references are automatically assigned by the
GMR software. Others are available for application use.
%R
max– 320+ (66xN)
to %R
mx
The length of %R data is configurable. At left, the letter N rep-
resents the number of bus controllers on the bus.
The GMR software requires the use of several areas of %R
memory, as detailed in this chapter.
%G0001 to %G0896
%GA0001 to %GA0896
%GB0001 to %GB0896
%GC0001 to %GC0896
The GMR software provides these memory areas for applica-
tion global data transfer. The correct method of program-
ming global data in a GMR system is described in this chap-
ter.
%M12225 to %M12256 System status bits
%M12257 to %M12288 System control flags
%R0001 to %R0256
(defaults: starting reference and
length are configurable)
%R startup initialization data from another online PLC.
References shown at left are the defaults; refer to your GMR
configuration printout for the actual references used.
%R0257 to %R0272
(defaults: starting reference is con-
figurable)
%M startup initialization data from another PLC. Refer-
ences shown at left are the defaults; refer to your GMR con-
figuration printout for the actual references used.
%M defaults to 16 words long.
Memory Write Access
With the exceptions noted above, the following memory areas can be written to if Write
Access is enabled during GMR configuration:
%R Registers
%AI Analog Input Table
%AQ Analog Output Table
%I Discrete Input Table
%Q Discrete Output Table
%T Temporary internal reference bits that are not saved through power loss
%M Internal reference bits that are saved through power loss
%G Global Data memory
%GD Global Data memory
%GE Global Data memory
For discrete (bit) memories: %I, %Q, %T, and %M, the starting reference must be on a
byte boundary 1, 9, 17, etc). Global Data %GA, %GB, and %GC memories are not
available. Those memory areas are used by the GMR system to exchange data (see
above), and cannot be accessed directly.
Page 6-23 describes configuration for setting up Write Access.