1 Overview
1-26
CJ2 CPU Unit Hardware User’s Manual
*11 Supported only by CJ2H-CPU6@-EIP and CJ2M-CPU3@.
*12 Supported only by the CJ2M-CPU3@.
Function Description
Self-diag-
nosis and
Restora-
tion
(Contin-
ued from
previous
page)
Non-fatal Error
Detection
System FAL Error Detec-
tion (User-defined non-
fatal error)
This function generates a non-fatal (FAL) error when the user-defined condi-
tions are met in program.
Duplicated Refreshing
Error Detection
This function detects an error when an immediate refreshing Instruction in an
interrupt task is competing with I/O refreshing of a cyclic task.
Basic I/O Unit Error Detec-
tion
This function detects the errors in Basic I/O Units.
Backup Memory Error
Detection
This function detects errors in the memory backup of the user programs and
parameter area (backup memory).
PLC Setup Error Detection This function detects setting errors in the PLC Setup.
CPU Bus Unit Error Detec-
tion
This function detects an error when there is an error in data exchange between
the CPU Unit and a CPU Bus Unit.
Special I/O Unit Error
Detection
This function detects an error when there is an error in data exchange between
the CPU Unit and a Special I/O Unit.
Tag Memory Error Detec-
tion
*11
This function detects errors in tag memory.
Battery Error Detection This function detects an error when a battery is not connected to the CPU Unit
or when the battery voltage drops.
CPU Bus Unit Setting
Error Detection
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.
Special I/O Unit Setting
Error Detection
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.
Option Board Error Detec-
tion
*12
This function detects the errors in Serial Option Board mounting status.
Fatal Error
Detection
Memory Error Detection This function detects errors that occur in memory of the CPU Unit.
I/O Bus Error Detection This function detects when an error occurs 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.
Unit/Rack Number Dupli-
cation Error
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.
Too Many I/O Points Error
Detection
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.
I/O Setting Error Detection The registered I/O tables are used to detect errors if the number of Units in the
registered I/O tables does not agree with the actual number of Units that are
connected or an Interrupt Unit has been connected in the wrong position.
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