Omron CJ1W-CT021 Operation Manual page 40

Quick Start Up Reference Guide
20
Depending on the Output Control Mode, 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 (287 work-
words for the CT021 are available). Therefore, at the end of every block with Coun-
ter Specific Settings, you can specify 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
"Memory Allocation".
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 "Interrupts")
Section 1-4