
2.CYCLIC TRANSMISSION DESCRIPTION B-63434EN/02
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Example: Allocating DO data of local node B and DI data of node C in the PMC area
Assume that the size of allocation of area 1 in the PMC area is 512
words (all of common memory area 1). Also assume that the size of
DO data in area 2 of the local node that is allocated in the PMC area
is B2" words. In this case, allocation of DI data in area 2 of node #C
in the PMC area is performed as follows:
When B1 + C1 + B2" + C2 <= 1024, all of C2 words can be allocated.
When B1 + C1 + B2" + C2 > 1024, up to 1024 - B1 - C1 - B2" (=
C2") words can be allocated.
NOTE
When all of common memory area 1 is allocated in the
PMC area, the value to be noted is also the sum of the
sizes of allocation of the local node area and another
node area in the PMC area.
In other words, when DI data of node #D is read under
the same conditions as for the above example, DI
data in common memory area 2 that satisfies (1024 -
B1 - D1 - B2”) can be read at a time.