Mitsubishi Electric MELSEC iQ-R Series - Page 985

7 APPLICATION INSTRUCTIONS
7.21 Database Access Instructions
983
7
Processing details
• These instructions commit the transaction in relation to the database corresponding to the identification number specified
by (s).
• Upon normal completion, the completion signal in the completion device (d1) 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 DBCOMMIT(P) instruction.
• SM753 (File being accessed) turns on while the DBCOMMIT(P) instruction is executed.
*1
While SM753 is on, the
DBCOMMIT(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
DBCOMMIT(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 DBCOMMIT(P) instruction is executed during execution of the database access instruction.
• An identification number outside the range is specified.
• The DBCOMMIT(P) instruction is executed while no transaction is going on.
• The identification number of a database which is not open is specified by (s).
Operation error
*2 For details, refer to the following.
Page 55 Checking the ranges of instruction runtime devices and labels
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.
*2
OFF
OFF
ON
ON
Program
DBCOMMIT(P) instruction
END processing END processing
Committing the
transaction
Completion device
(d1)
Completion device
(d1)+1
END processing
Error completion