Omron CJ2 User Manual page 52

1 Overview
Function
Self-diag- Non-fatal Error System FAL Error Detec-
nosis and Detection tion (User-defined non-
Restora- fatal error)
tion
Duplicate Refreshing Error
(Contin-
Detection
ued from
Basic I/O Unit Error Detec-
previous
tion
page)
Backup Memory Error
Detection
PLC Setup Error Detection
CPU Bus Unit Error Detec-
tion
Special I/O Unit Error
Detection
Tag Memory Error Detec-
tion
Battery Error Detection
CPU Bus Unit Setting
Error Detection
Special I/O Unit Setting
Error Detection
Memory Error Detection
I/O Bus Error Detection
Unit/Rack Number Dupli-
cation Error
Too Many I/O Points Error
Detection
I/O Setting Error Detection
Fatal Error Program Error Detection
Detection
Cycle Time Exceeded
Error Detection
1-16
This function generates a non-fatal (FAL) error when the user-defined condi-
tions are met in program.
This function detects an error when an immediate refreshing Instruction in an
interrupt task is competing with I/O refreshing of a cyclic task.
This function detects the errors in Basic I/O Units.
This function detects errors in the memory backup of the user programs and
parameter area (backup memory).
This function detects setting errors in the PLC Setup.
This function detects an error when there is an error in data exchange between
the CPU Unit and a CPU Bus Unit.
This function detects an error when there is an error in data exchange between
the CPU Unit and a Special I/O Unit.
This function detects errors in tag memory.
This function detects an error when a battery is not connected to the CPU Unit
or when the battery voltage drops.
This function detects an error when the model of a CPU Bus Unit in the regis-
tered I/O tables does not agree with the model that is actually mounted in the
PLC.
This function detects an error when the model of a Special I/O Unit in the regis-
tered I/O tables does not agree with the model of Unit that is actually mounted.
This function detects errors that occur in memory of the CPU Unit.
This function detects errors has occur in data transfers between the Units
mounted in Rack slots and the CPU Unit and detects when the End Cover is
not connected to the CPU Rack or an Expansion Rack.
This function detects an error when the same unit number is set for two or more
Units, the same word is allocated to two or more Basic I/O Units, or the same
rack number is set for two or more Racks.
This function detects an error when the total number of I/O points set in the I/O
tables or the number of Units per Rack exceeds the specified range.
This function detects an error when the number of Units in the registered I/O
tables does not agree with the actual number of Units that is mounted, or an
Interrupt Unit has been connected in the wrong position, i.e., not in slot 0 to 3.
This function detects errors in programs.
Instruction Processing This function detects an error when the given data value is invalid when execut-
Error Detection ing an instruction, or execution of instruction between tasks was attempted.
Indirect DM/EM BCD This function detects an error when an indirect DM/EM address in BCD mode
Error Detection is not BCD.
Illegal Area Access This function detects an error when an attempt is made to access an illegal
Error Detection area with an instruction operand.
No END Error Detec- This function detects an error when there is no END instruction at the end of
tion the program.
Task Error Detection This function detects an error when there are no tasks that can be executed in
a cycle, there is no program for a task, or the execution condition for an inter-
rupt task was met but there is no interrupt task with the specified number.
Differentiation Over- This function detects an error when too many differentiated instructions are
flow Error Detection entered or deleted during online editing (131,072 times or more).
Invalid Instruction Error This function detects an error when an attempt is made to execute an instruc-
Detection tion that is not defined in the system.
User Program Area This function detects an error when instruction data is stored after the last
Overflow Error Detec- address in user program area.
tion
This function monitors the cycle time (10 to 40,000 ms) and stops the operation
when the set value is exceeded.
Description
CJ2 CPU Unit Hardware User's Manual