
B-64164EN/01 SPECIFICATION 2.CYCLIC TRANSMISSION
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2.2.2 Separate Allocation of DI and DO Areas
For data exchange with common memory area 2, DI and DO areas can
be set separately to allocate them to the E, R, or D area of the PMC.
NOTE
When a small amount of data in common memory
area 2 is to be exchanged, make settings for data
exchange between common memory area 2 and
the PMC area according to the method described
in Subsection 2.2.1, "Simultaneous DI and DO
Area Allocation".
2.2.2.1 DO data allocation
In data exchange of DO data in common memory area 2, data can be
shifted by an offset when the data is transferred from the PMC area to
common memory area in case the PMC area that can be allocated is
smaller than the common memory area of the local node.
General DO data allocation
Related parameters
(1) Pa13: Area 2 address
(2) Pa14: Area 2 size (in words)
(3) Pa40: PMC start address (for DO)
(4) Pa41: Allocation size (for DO) (in words)
(5) Pa61: Bit 2 (DTL) of parameter 2 = 1
PMC area and common memory area 2
PMC R area
Common memory
area 2
7 0
15 0
Transmit data
from other nodes
DO Transmit data of
the local node
Transmit data
from other nodes
NOTE
When 0 is set in Pa41 (allocation size (for DO)), DO
data exchange from the PMC area to common
memory area 2 is not performed.
Pa40→
Pa41
Pa14
Pa13→