Overview; Data Flow - Omron CJ1W-CT021 Operation Manuals

4 Exchanging Data with CPU
4-1

Overview

4-1-1

Data Flow

The CPU Unit and the high-speed Counters exchange data via the I/O port created for the High-speed
Counter Unit.
The table and figure below show the data exchange method for each data type.
Data exchange type
Unit data type
For Inputs
For Outputs
For Settings *2
Range data *2
Comparison data *2
Unit Restart Bit, etc.
*1 While *_UnitInitSta (Unit Busy) is 1, I/O is not refreshed. (For example, Counter Values are not refreshed dur-
ing this time.)
*2 The setting data, range data, and comparison data are retained in the CPU Unit by the battery even during
power interruptions.
4-2
AT specification
Data contents
destination
Count start and I/O port (for Inputs,
stop, count value, Outputs)
status of each
Counter, etc.
External output con- I/O port (for Set-
trol, external input tings)
function setting, set-
tings for each
Counter, etc.
Range data Memory used for
CJ-series Unit
Comparison data
Unit Restart Bit, etc. None
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
How to access Timing of data
from user program exchange
Device variable for At I/O refreshing *1
CJ-series Unit
When the Controller
is reset or the Unit
restarts
User-defined Vari-
able
System-defined vari- At I/O refreshing
able