Omron CJ1W-CT021 Operation Manual page 39

Quick Start Up Reference Guide
1-4-1 Configuring the High-speed Counter Unit
Configuration
Simple Counter
Circular/Linear Counter
Indirect Addressing for
Circular and Linear
Counters
Configuring every Counter starts with choosing the Counter Type (Simple, Circu-
lar or Linear).
For Simple Counters you do not have to make any DM-configuration settings,
since for Simple Counters all default (DM-) settings are used. You can choose to
use Simple Counters if you intend to use the Counter only with basic counting
functionality (refer to 3-2-1 "Simple Counter" for details and to 1-5 "Operating Pro-
cedure Guidelines" for a quick start up procedure)
If you want to use the full available functionality for a Counter, you must configure
it for Circular or Linear Counter (refer to 3-2-2 "Circular Counter" and 3-2-3 "Linear
Counter" for details and to 1-5 "Operating Procedure Guidelines" for a quick start
up procedure).
Next the Input Signal Type (Phase Differential, Up/Down, or Pulse & Direction) for
every Counter has to be defined. Depending on the requirements of the application
one or more (maximum 2) Digital Inputs can be assigned to a Counter. To configure
the Digital Input(s) a choice can be made out of 17 available modes (e.g. Gate,
Enable Reset or Combination Modes, see 3-4 "Digital Input Functions"). During
operation of the Counter, the Counter can be Started, Stopped, Reset, Captured
or Preset by using the Digital Input(s) or the corresponding bits in CIO.
Controlling the Outputs is done by choosing the Output Control Mode (Range or
Comparison Mode). Furthermore 4 additional control mechanisms are available to
control the Outputs (Programmable Output Pulse, Output State Control, Manual
Control and Hysteresis). Refer to 3-5 "Output Control".
In case the Counter Input Signals (A, B, Z) and the Digital Input Signals (I0 to I1)
are exposed to electromagnetic noise, a noise filter can be configured (10 kHz,
50 kHz (=default) or 500 kHz) to suppress this noise. The 500 kHz noise filter is
only available for the Counter Input Signals and not for the Digital Input Signals.
Refer to 3-7-4 "Noise Filtering".
As background calculation, executed in parallel to operating the Counters, Rate
Measurement can be configured by choosing the appropriate Time-Window [1 to
9999 ms]. The calculated Rate Values are stored in the corresponding Rate His-
tory Log File inside the Unit and can be retrieved by issuing an IORD-command
from the PLC Ladder Program. Rate Measurement can be enabled/disabled for
every Counter. Refer to 3-7-2 "Rate Measurement".
The CJ1W-CT021 High-speed Counter Unit is allocated 400 DM-words in the
Special I/O Unit DM-Area and a block of 40 CIO-words in the Special I/O Unit Area
of the PLC. The configuration of the Unit is done by making the appropriate DM-
settings in the Special I/O Unit DM-Area that is allocated to the Unit.
The Special I/O Unit DM-Area is divided in an area of 30 words to make the Gen-
eral Unit Settings and 2 blocks of 45 DM-words each to make the Counter Specific
Settings, which are unique for every Counter. The remaining 287 words of the 400
DM-words can be used as work-words in the PLC Ladder Program.
Section 1-4
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