Counter Types - Omron CJ1W-CT021 Operation Manuals

3 Operation and Configuration
3-2

Counter Types

Every single Counter of the High-speed Counter Unit can be set independently to one of the following
Counter Types (for an overview of the differences between Simple and Circular/Linear Counters refer
to 1-4 Quick Start Up Reference Guide):
• Simple Counter (refer to 3-2-1 Simple Counter)
• Circular Counter (refer to 3-2-2 Circular Counter)
• Linear Counter (refer to 3-2-3 Linear Counter)
The configuration starts by setting each Counter's DIP switch on the front of the Unit.
The factory setting is all DIP switches are set to OFF (for Simple Counters). When you use a Counter
as a Circular Counter or Linear Counter, set them to ON, and select circular or linear by using the
device variables for CJ-series Unit (for setting) as shown below.
In the description hereafter, each variable name has a prefix "*". This indicates the device name when
this Unit is registered in the Unit Configuration. For details, refer to 4-1-3 Access from User Program.
Name of device variable
for CJ-series Unit
*_Ch1_CtTypCfg
*_Ch2_CtTypCfg
A Circular Counter and a Linear Counter can use all functions provided for a High-speed Counter Unit,
and can have various setup. A Simple Counter, however, can only use the default functions.
Counter Value
For all Counter Types the 32-bit Counter Value is stored in the following device variables for CJ-
series Unit (for input): The data range depends on the type of Counter.
Name of device variable
for CJ-series Unit
*_Ch1_LinCtVal
*_Ch2_LinCtVal
*_Ch1_RingCtVal
*_Ch2_RingCtVal
3-6
Type Name
UINT Counter Type
Type Name
DINT Counter Value
UDINT Counter Value
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
Function
0: Circular Counter
1: Linear Counter
Function
Used for a Simple Counter or Linear
Counter.
−2,147,483,648 to +2,147,483,647
Used for a Circular Counter.
0 to +4,294,967,295