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4-1
Data Configuration and Allocation
IR words 100 through 199 are allocated as I/O refresh areas. Each Counter Unit
is allocated 10 consecutive words (although not all modes use all 10 words). The
first IR word for each Counter Unit, designated in this manual as n, can be com-
puted from the unit numbers as follows:
n = 100 + 10 x unit number.
IR words are refreshed during the PC’s I/O refresh cycle. Note that input and out-
put designations are in reference to the PC, e.g., command bits are outputs, sta-
tus bits are inputs.
Each Counter Unit is also allocated 100 consecutive words as a parameter area
(although not all modes use all 100 words). These words are in the DM area and
run from DM 1000 through DM 1999. The first DM word for each Counter Unit, m,
can also be computed from the unit number:
m = 1000 + 100 x unit number.
All DM area data for the Counter Unit is transferred to it whenever power is
turned ON or the Counter Unit is reset.
Data Configuration and Allocation
Section 4-1
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