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6
6-23GFK-0787B Chapter 6 Configuration
Write Access
Next, select System to configure Write Access:
On this screen, you can configure starting addresses and lengths for any memory areas
to which data can be written to through a CMM, PCM, or Ethernet Communications
Module. These configuration parameters do not prevent write access through Genius
Bus Controllers, the CPU’s built-in port or with serial or parallel Logicmaster 90-70.
The following memory areas can potentially be written to:
%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
The Start parameter for each memory area is the start of the address range to which
write access will be permitted. It may be from 1 to the maximum table size.
The Length parameter is the length of the address range to which write access will be
permitted. A value of 0 (the default) means the entire contents of that memory type is
write-protected. For %R, %AI, and %AQ memory, length is in units of registers (words).
For discrete (bit) memories: %I, %Q, %T, %M, %G, %GD, and %GE, the starting
reference must be on a byte boundary (1, 9, 17, etc). For these memory types, the length
is in units of points (bits). It must be specified in multiples of 8 bits (8, 16, 24, etc...)
Global Data %GA, %GB, and %GC memories are not available. Those memory areas are
used by the GMR system to exchange data (as explained on page 7-27), and cannot be
accessed directly.
Exiting the Window
When you have completed this screen, select OK to return to the System screen.
When you select OK, your entries are saved and the window disappears. If you want to
exit the window and reset all fields to their previous content, select Close or Cancel instead.