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Section 1-4
$,
words of the 400 DM-words can be used as work-words in the PLC Ladder Pro-
gram.
CS1W-CT041:
For the CT041 the Special I/O Unit DM-Area is divided in an area of 30 words to
make the General Unit Settings and 4 blocks of 45 DM-words each used to make
the Counter Specific Settings, which are unique for every Counter. The remaining
197 words of the 400 DM-words can be used as work-words in the PLC Ladder
Program.
Depending on the Output Control Mode, for every Counter Range- or Comparison
Data can be set. Like this, for every Counter, up to a maximum of 32 Ranges or
Comparison Values can be assigned. You can set the Range- or Comparison Data
in a part of DM or EM which is not being used. If you only intend to use a limited
number of Ranges or Comparison Values then it is also possible to use the work-
words of the Special I/O Unit DM-Area to store the Range- or Comparison Data
(197 work-words for the CT041 and 287 work-words for the CT021 are available).
Therefore, at the end of every block with Counter Specific Settings, you can spec-
ify an Indirect Address. This Indirect Address points to the actual memory location
where the Range- or Comparison Settings of that specific Counter are stored.
For a detailed description about the CIO- and DM-Memory Allocation refer to 4-2
.
Note
During operation of the Unit, for Circular and Linear Counters run-time configura-
tion is possible by using the IOWR-instruction from the PLC Ladder Program (refer
to 4-5
"Supported IOWR/IORD-Instructions"
). Additionally, the Digital Inputs and
Outputs can be configured to generate interrupts to the PLC by setting the appro-
priate Interrupt Masks in DM. (refer to 4-6
)
W902-E2-03.book Seite 19 Donnerstag, 7. Oktober 2004 2:06 14
Содержание CS1W-CT021
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