1-15
1 Overview
CJ2 CPU Unit Hardware User’s Manual
1-3 Specifications
1
1-3-3 Function Specifications
Power
Supply
Manage-
ment
Memory Protection Holding Area data, DM Area data, Counter Completion Flags, and counter
present values are held even when power is turned OFF. CIO Area, Work Area,
some Auxiliary Area data, and Timer Completion Flags, timer present values,
index registers, and data registers can be protected by turning ON the IOM
Hold Bit in the Auxiliary Area, and by also setting the IOM Hold Bit to “Hold” in
the PLC Setup.
Power OFF Detection Time Setting The detection time for power interruptions can be set.
AC power supply: 10 to 25 ms (variable)
DC power supply: 2 to 5 ms (CJ1W-PD022) or 2 to 20 ms (CJ1W-PD025)
Power OFF Detection Delay Time The detection of power interruptions can be delayed: 0 to 10 ms
(Not supported by the CJ1W-PD022.)
Number of Power Interruptions Counter The number of times power has been interrupted is counted.
Function Blocks Standard programming can be encapsulated as function blocks.
Languages in Function Block Definitions Ladder programming or structured text
Debug-
ging
Online Editing The program can be changed during operation (in MONITOR or PROGRAM
mode), except for block programming areas.
Force-Set/Reset Specified bits can be set or reset.
Differentiate Monitoring ON/OFF changes in specified bits can be monitored.
Data Tracing The specified I/O memory data can be stored in the trace memory in the CPU
Unit. The triggers can be set.
• The trace data can be uploaded during data tracing using CX-Programmer,
which enables continuously logging the data by constantly uploading the
trace data (trace data uploading during tracing).
• Data tracing can be automatically started when operation is started (i.e.,
when the operating mode is changed from PROGRAM mode to MONITOR or
RUN mode).
Storing Location of Error when an Error
Occurs
The location and task number where execution stopped for a program error is
recorded.
Program Check The programs can be checked for items such as no END instruction and
FALS/FAL errors at startup.
Self-diag-
nosis and
Restora-
tion
Error Log A function is provided to store predefined error codes in CPU Unit, error infor-
mation, and time at which the error occurred.
CPU Error Detection CPU Unit WDT errors are detected.
User-defined Failure Diagnosis Errors can be generated for user-specified conditions: Non-fatal errors (FAL)
and fatal error (FALS).
Program section time diagnosis and program section logic diagnosis are sup-
ported (FPD instruction).
Load OFF Function This function turns OFF all outputs from Output Units when an error occurs.
RUN Output This output from the CJ1W-PA205R turns ON while CPU Unit is in RUN mode
or MONITOR mode.
Basic I/O Load Short-circuit Detection This function provides alarm information from Basic I/O Units that have load
short-circuit protection.
Failure Point Detection The time and logic of an instruction block can be analyzes using the FPD
instruction.
CPU Standby Detection This function indicates when the CPU Unit is on standby because all Special
I/O Units and CPU Bus Units have not been recognized at the startup in RUN
or MONITOR mode.
Function Description
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