Omron CJ1W-CT021, Инструкции по эксплуатации, Страница: 88 / 196

3 Operation and Configuration
3-8
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
Additional Information
• The CPU exchanges data with the Simple Counter via the device variables for CJ-series Unit
(for input/output).
• If a Counter is set as a Simple Counter, it is indicated in the device variables for CJ-series Unit
(for input).
• The device variables for CJ-series Unit (for setting) that set Counter functions are not used for
a Simple Counter.
z
Controlling Simple Counters via Device Variables for CJ-series Unit (for
input/output)
You can control Simple Counters from device variables for CJ-series Unit (for input/output). For
details on device variables for CJ-series Unit (for input/output), refer to 4-2-3 Details of Device Vari-
ables for CJ-series Unit (for input/output).
The following gives a detailed description of all the features and functions for Simple Counters that
are available in device variables for CJ-series Unit (for input/output).
z
32 Bits Counting Range
A Simple Counter has the full counting range (=32 bits) available to count up- or downwards over
the positive and negative counting range between the Lower Count Limit (–2,147,483,648) and the
Upper Count Limit (+2,147,483,647).
z
Overflow and Underflow
If a Counter Value exceeds the upper or lower limit, it is reflected to the following device variables
for CJ-series Unit (for input) as an overflow or underflow. The Counter Value is retained as the time
of overflow or underflow, and subsequent pulses are ignored. You can clear overflow and underflow
with a preset or reset.
Name of device variable
for CJ-series Unit
Type Name Function
*_Ch1_CtOvf BOOL Counter Overflow 1: Overflow
0: Other than the above
*_Ch2_CtOvf
*_Ch1_CtUdf BOOL Counter Underflow 1: Underflow
0: Other than the above
*_Ch2_CtUdf
Counter V alue
0
Lower Count Limit
-2,147,483,648
(=80000000
H
)
Upper Co unt L imit
+2,147,483,647
(=7FFFFFFF
H
)
Up Counting
Down Co unting
Underflow Overflow