Omron NX701-1620 User Manual

5 Other Functions
5-20
NJ/NX-series Database Connection CPU Units User’s Manual (W527)
Resend Flow by User Program
Write the user program to re-execute the instruction that is being executed at the time of power
interruption. The resend flow differs by whether a DB_Insert or DB_Update instruction is being
executed at the time of power interruption.
 When a DB_Insert instruction is being executed
DB_CreateMapping
instruction
Create a DB Map Variable
(for DB record check)
Retrieve records from the DB
using information of the SQL statement
being sent at power interruption as
retrieval condition
Resend processing
required?
Close the DB Connection
Create a DB Map Variable
(for resend)
Re-execute the DB_Insert
instruction
DB_Insert instruction
DB_CreateMapping instruction
DB_Select instruction
DB_Close instruction
Read output parameters
of Busy
and SendStatus output variables
Change the output parameters of Busy and
SendStatus output variables to initial values
START
Establish a DB Connection
DB_Connect instruction
1st cycle of the
operation
?
NO
YES
Values of output
parameter
s of Busy and
SendStatus
output
variables?
Resend processing required
Resend processing not required
Others
YES
Already reflected into
the DB?
(Records retrieved?)
NO
END
NO
YES
Busy = TRUE and
SendStatus = _DBC_SEND_
SENDING

Omron NX701-1620 Specifications

General

Brand	Omron
Model	NX701-1620
Category	Controller
Language	English