7-46
Timer Tr
Timer Tfr
Timer Tfs
Set the periods to monitor the transmission and reception steps with timers Tr, Tfr, and
Tfs. The following timing chart shows the meaning of each monitor.
Be sure to set the periods according to the application.
The step will be retried if the step is not completed within the monitor periods. An error
will occur if the step is not completed within the monitor time again.
Note Set a period of approximately 0.5 s each for communications with the 3G3MV.
Send & Recv
Monitored for Tfs
period.
Monitored for Tr period.
Monitored for Tfr
period.
Ts: Send wait time set per step. Nothing is sent during this period.
Tfs: Monitors the completion ofthedatasent. If the datatransmission isnot finished
within this period, the data will be re-transmitted.
Tr: Monitors the response to be received. If the response is not returned within this
period, the response will be re-transmitted.
Tfr:Monitorsthereceptioncompletionoftheresponse.Ifthe responsetransmission
is not finished within this period, the response will be re-transmitted.
NoteIf the Tr period is too long, the time required to detect a communications error
willbelonger,duringwhichtheInvertercannotbecontrolled.Therefore,besure
to set an appropriate period.
H Creating a Step
1. Double-click on Protocol with the left button of the mouse.
2. Click on Sequence with the leftbutton of the mouseand click onablank space with
the right button of the mouse.
3. Select New Step.
The following table will appear. Set the parameters related to the step in the table.
* Step Repeat
counter
Com-
mand
No. of
retries
Send
wait
time
Send
mes-
sage
Recv
message
Res-
ponse
write
Next
process
Error
process
j
00 Reset/R
(1)
Send &
Recv
3 --- Input
send
Input
response
Yes Next Abort
j
01 Reset/R
(1)
Send &
Recv
3 --- Status Read
response
Yes End Abort
j
Communications Chapter 7
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