Sample Ladder Program Processing Flow - Omron NE1A-EDR01 Operation Manual

Sample Ladder Programs
4-5-3

Sample Ladder Program Processing Flow

Initial processing
Connection open processing
Connection open
Monitor message creation
BUFSND instruction execution
BUFRCV instruction execution
Connection close processing
Connection close
The following flowchart shows the flow of processes in the sample ladder pro-
grams.
# Executed automatically.
successful?
Abnormal completion signal
M101 turns ON and the error code
is stored in the completion
status area (D101).
Message
communication
successful?
Abnormal completion signal
M301 turns ON and the error
code is stored in the completion
status area (D3001).
Message
reception
successful?
successful?
Abnormal completion signal
M201 turns ON and the error
code is stored in the completion
status area (D2001).
END
Abnormal completion signal
M501 turns ON and the error
code is stored in the completion
status area (D5001).
Section 4-5
Connection
open
processing
Status
Request message
monitor
communications
processing
processing
Response
message transmission
processing
Connection
close
processing
47