13 DATABASE FUNCTION
13.3 CPU Module Database Access (from External Device) Function
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When the load of the CPU module is high
When the CPU module database access function is used with high circuit load to the Ethernet port of the CPU module by
other functions or high access load to the SD memory card, a timeout error may occur in the application on the personal
computer side. In this case, eliminate the cause of the error and execute this function.
Errors
■Errors detected by the CPU module
The CPU module starts the ODBC server based on the setting of the module parameter. When the CPU module fails to start
the ODBC server, the error code is stored in SD1498 (Start-up status of CPU module database). For the error code to be
stored, refer to the following.
MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks)
■Errors detected by the personal computer
When an error occurs during the access to the database of the CPU module, the CPU module returns the error message to
the personal computer. In this case, check the error message displayed on the personal computer and eliminate the cause of
the error. The error causes are as follows.
• The built-in database access setting of the module parameter is disabled.
• The ODBC server of the CPU module is not started. (SM1498 is not on.)
• The communication between the Ethernet port of the CPU module and the personal computer is not established.
• There is no database to be accessed.
• Multiple accesses are simultaneously performed to an access target database.
• A broken database is being accessed.
• The database is accessed when the circuit load of the Ethernet port of the CPU module or the access load to the SD
memory card are high.
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