Communication Timing Chart; Reading Data From Programmable Controller; Writing Data To Programmable Controller - Mitsubishi Electric MELSEC FX Series User Manual

FX communication
7.5

Communication Timing Chart

7.5.1

Reading Data from Programmable controller

Computer
Interface
Programmable
controller
Programmable
controller program
7.5.2

Writing Data to Programmable Controller

Computer
Interface
Programmable
controller
Programmable
controller program
Wait(TW)
T 0 T 1 T2
END Step 0 END Step 0
If the wait time has expired the response is sent at completion of the
END process, otherwise the wait time is checked again during the next
END process.
Wait(TW)
Writing data
T0 T 1 T 2
END Step 0 END Step 0
If the wait time has expired the response is sent at completion of the
END process, otherwise the wait time is checked again during the next
END process.
T 3 T4
More than two-scan
delay is needed.
This time becomes 0 when the message wait time is not set or
when the wait time is less than the processing time needed by
the programmable controller.
END Step 0 END
T3
This time becomes 0 when the message wait time is not set or
when the wait time is less than the processing time needed by
the programmable controller.
END Step 0 END
Computer link 7
T 5
7-12