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1 Overview and Specifications
CP1E CPU Unit Hardware User’s Manual(W479)
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Function
Description
Power sup-
ply man-
agement
Memory protection
Holding Area data, DM Area data, Counter Completion Flags, and Counter
Present Values are held even when power is turned OFF.
This function is valid only when an optional battery is mounted.
Number of power interruptions counter
The number of times power has been interrupted is counted.
Debugging
Online editing
The program can be changed during operation in MONITOR mode or PRO-
GRAM mode.
Force-set/reset
Specified bits can be set or reset.
Differentiate monitoring
ON/OFF changes in specified bits can be monitored.
Storing the stop position at errors
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
restoration
Error Log
Details and the time of occurance of error codes predefined by the CPU Unit
are stored.
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 errors (FALS).
Load OFF function
The built-in outputs, Expansion I/O Unit outputs, and Expansion Unit outputs
are turned OFF.
Non-fatal error
detection
System FAL error detection
(User-defined non-fatal error)
This function generates a non-fatal (FAL) error when the user-defined condi-
tions are met in program.
Backup memory error detection
This function detects when data in the backup memory (built-in EEPROM) that
stores the ladder program is corrupted.
PLC Setup error detection
This function detects setting errors in the PLC Setup.
Option Board errors
This function detects when the Option Board is malfunctioning or discon-
nected.
Battery error detection
(N/NA
(S
)-type CPU Units only)
This function detects when the battery voltage is low or the battery is discon-
nected.
* This function is valid only when a battery is mounted and the Do not detect
battery error Check Box is cleared in the PLC Setup.
Built-in analog errors (NA-type CPU
Units only)
This function detects built-in analog I/O errors.
Fatal Error Detec-
tion
Memory error detection
This function detects errors that occur in memory of the CPU Unit.
I/O bus error detection
This function detects errors that occur during data transfer between the CPU
Unit and another Unit.
Detection of too many I/O points
This function detects when more than the maximum number of CP1W Expan-
sion I/O Units and Expansion Units are connected to the PLC.
Program error detection
This function detects when there is an error in the program.
See the following for details.
Instruction processing error
detection
This function detects an error when the given data value is invalid when exe-
cuting an instruction, or execution of instruction between tasks was attempted.
Indirect DM addressing BCD
error
This function detects an error when an indirect DM/EM address in BCD mode
is not BCD.
Illegal area access error detec-
tion
This function detects an error when an attempt is made to access an illegal
area with an instruction operand.
No END error detection
This function detects an error when there is no END instruction at the end of
the program.
Task error detection
The execution condition for an interrupt task was met but there is no interrupt
task with the specified number.
Differentiation overflow error
detection
This function detects an error when too many differentiated instructions are
entered or deleted during online editing (131,072 times or more).
Invalid instruction error detec-
tion
This function detects an error when an attempt is made to execute an instruc-
tion that is not defined in the system.
User program area overflow
error detection
This function detects an error when instruction data is stored after the last
address in user program area.
Cycle time exceeded error detec-
tion
This function monitors the cycle time (10 to 1,000 ms) and stops the operation
when the set value is exceeded.
System FALS error detection
(user-defined fatal error)
This function generates a fatal (FALS) error when the user-defined conditions
are met in program.
Mainte-
nance
Automatic online connection via network
This function enables automatically connecting to the PLC online when the
CX-Programmer is directly connected by a serial connection (peripheral USB
port or serial port).
Security
functions
Read protection using password
This function protects reading and displaying programs using passwords.
Read protection: Set a password using the CX-Programmer.
* Overwrite protection function not included.
Write protection from FINS commands
This function prohibits writing by using FINS commands sent over the network.
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