Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

Page: 957 / 2110

7 APPLICATION INSTRUCTIONS
7.21 Database Access Instructions
955
7
Processing details
• These instructions release the connection between the database identification number specified by (s) and the
corresponding database.
• Upon successful completion, the completion signal in the completion device (d1)+0 is turned on and 0 is stored as the
completion status in the device (d2).
• The following figure shows the operation of the completion device at completion of the DBCLOSE(P) instruction.
• If the DBCLOSE(P) instruction is executed before DBCOMMIT(P) or DBROLBAK(P) while the transaction is run by the
DBTRANS(P) instruction, the transaction is determined in the status at the execution of the DBCLOSE(P) instruction.
• SM753 (File being accessed) turns on while the DBCLOSE(P) instruction is executed.
*1
While SM753 is on, the
DBCLOSE(P) instruction cannot be executed. If executed, no processing is performed. However, the instruction has been
completed with an error while the database access instruction is being executed.
• When "To Use or Not to Use the Built-in Database Access" is set to "Use" in the module parameter of the CPU module, the
DBCLOSE(P) instruction cannot be executed while SM1498 (CPU module database start-up flag) is off.
*1
If executed, no
processing is performed.
*1 For the firmware versions supporting SM753 and SM1498, refer to the list of special relay areas. (  MELSEC iQ-R CPU Module
User's Manual (Application))
Precautions
In the following cases, the error completion signal in (d1)+1 is turned on and an error code is stored as the completion status
in the device (d2).
• The DBCLOSE(P) instruction is executed during execution of the database access instruction.
• The identification number specified by (s) is an already disconnected database.
• An identification number outside the setting range is specified by (s).
Operation error
For the error code stored in the completion status of the operand, refer to the following.
 Page 986 Error codes related to database access instructions
Error code
(SD0) Description
2820H The area specified by (d1) exceeds the applicable range of the device/label used.
OFF
OFF
ON
ON
Program
DBCLOSE(P) instruction
Completion device (d1)
Completion device (d1)+1
END processing END processing END processing
Closing
the database
Error completion