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4 Exchanging Data with CPU
4-2
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
4-1 Overview
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
*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.
4-1-1 Data Flow
Unit data type Data contents
AT specification
destination
How to access
from user program
Timing of data
exchange
For Inputs
For Outputs
Count start and
stop, count value,
status of each
Counter, etc. I/O port (for Inputs,
Outputs) Device variable for
CJ-series Unit At I/O refreshing *1
For Settings *2 External output con-
trol, external input
function setting, set-
tings for each
Counter, etc. I/O port (for Set-
tings) When the Controller
is reset or the Unit
restarts
Range data *2 Range data Memory used for
CJ-series Unit User-defined Vari-
able
Comparison data *2 Comparison data
Unit Restart Bit, etc. Unit Restart Bit, etc. None System-defined vari-
able At I/O refreshing