6
6-21GFK-0787B Chapter 6 Configuration
If, when the PLC is starting up, the other two PLCs are already online,
%M data from the second online PLC (the one with the lower serial bus
address) is also received by the initializing PLC.
In the %R Temp Ref field, enter a starting reference in %R memory to
receive %M data from the second online PLC. (In this field, the %M
refers to the type of data being received. In the two fields on the
previous page, it refers both to the type of data being received and the
memory location where it will be placed).
Notice that this field shows a initial starting reference of 257. By default,
the %M data from the second online PLC is stored directly after the %R
data from the first:
%R0001
%R0256
%R0257
%R0272*
%R Initialization from
First Online PLC
%M Initialization from
Second Online PLC
* if following the previous example
If the PLCs will exchange %R data during startup, enter a starting
reference and length in words. (If the PLCs will not exchange %R data
at startup, enter 0 in the %R length field. Enter an starting reference for
the %R data to be received from the other PLC(s) online during CPU
initialization. By default, this starting reference is %R0001.
Enter a length in words for the %R data. The amount needed depends on
%R memory usage in the application program. The default length is 256.
The table below lists total limits for these items.
Item Parame-
ters Comment
Starting reference for %M init. data 1 to 12224 Must be on 8-bit boundaries.
Length of %M initialization data 0 to 764 Length in words.
(start ref +16 X length)<=12288
0 if no %M init. data
Starting reference for %M temporary ini-
tialization data (to be stored in%R) 0 to 16384 0 if length of %M init. data (above) is 0.
Starting reference for %R init. data 1 to 16384
Length of %R initialization data 0 to 4096 0 if no %R init. data
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.
%R Temp Ref
%R Start Ref
%R Length