Overview - Omron CJ1W-CT021 Operation Manual

Overview

3-1

Overview

46
After you have installed and wired the CJ1W-CT021 High-speed Counter Unit as
described in 2-2 "Installation" and 2-3 "Wiring", you have to configure the Unit by
making DM-settings. Only Counters that have been configured for Circular/Linear
Counter (corresponding DIP switch on the front of the Unit in the ON-position) can
be DM-configured. For Simple Counters the default DM-settings are used and no
DM-settings can be made.
In this section you will learn how to configure the CJ1W-CT021 High-speed Coun-
ter Unit in order to adjust the behaviour of the Unit according to the specific
requirements of your application (refer to 1-4 "Quick Start Up Reference Guide" for
an overview of the configuration items for every Counter). Also throughout this
section, the CIO-words that are relevant to operate the Unit from the PLC ladder
program are mentioned (refer to 4-2-3 "CIO-Memory Mapping" for an overview).
For an overview of all the DM-settings that can be made refer to 4-2-4 "DM-Mem-
ory Mapping".
All the features and functions that the High-speed Counter Unit offers are (DM-)
configurable (except the configuration of the Simple Counter which is done by DIP
switch). In the Special I/O Unit DM-area that is allocated to the High-speed Coun-
ter after the Unit has been properly installed (see 1-5 "Operating Procedure
Guidelines"), all the available features and functions of the Unit are represented by
their corresponding DM-words. You are free to choose the sequence in which you
configure the different functions. However, you are recommended to follow the
sequence of configuring the features and functions in the order as described in
this section.
Note 1. Throughout this section for the DM- and CIO- addresses an offset is defined
with respect to the physical address of the first word of the block that is allo-
cated to the High-speed Counter Unit (N = Machine Number):
•
m = DM20000 + (Nx100), address of the first word of the block of 400 DM-
words that are allocated to the Unit
•
n = CIO2000 + (Nx10), address of the first word of the block of 40 CIO-
words that are allocated to the Unit
Example: m+2 indicates the DM-word located at DM20000 +(Nx100) + 2.
2. Double words are indicated as for example "n+22, n+23" (double word in CIO)
or "m+57, m+58" (double word in DM). How to distinguish between the least-
and most significant words (LSW and MSW) within double words, you should
refer to the section called "About this Manual" at the beginning of this Manual.
Section 3-1