14-6
Chapter 14
RS485 Communication
14.2.4
Communication process
Communication process
Communication between external control equipment and
the inverter is carried out in the following process:
①
Frame sent from external control equipment to the
inverter (query)
②
Frame returned from the inverter to external control
equipment (response)
③
After the inverter sends a response, if a query from the
hose is not completely received within the time set in
[CF-06] (communication timeout time), the inverter will be
in the condition of receiving the head data again. During
this, the inverter will be in a no response condition and
will behave as set in the communication error selection.
For more details, see the following.
Parameter
Monitoring of reception timeout begins following the
completion of first transmission after the power supply is
turned ON or reset. A reception timeout does not occur until
a transmission is performed.
A response from the inverter (frame
②
) is output as a reply
after the inverter receives a query (frame
①
) and hence is
not output actively.
Item
Parameter
Data
Description
Communication error
selection
[CF-05]
00:Trip
Trip with error [E041] after reception timeout.
01:Trip after stopping
Deceleration stop after reception timeout.
Trip with error [E041] after stopping.
02:Ignore
No trip, nor alarm output.
03:Free-run stop
No free-run stop trip, nor alarm output after
reception timeout.
04:Deceleration stop
No deceleration stop, nor alarm output after
reception timeout.
Communication
timeout time
[CF-06]
0.00~100.00(s)
The time until reception timeout.
Communication
waiting time
[CF-07]
0.~1000.(ms)
Waiting time until a reply starts after completion of
receiving (excluding silent interval).
A
Waiting time
(Silent interval of at least [3.5 character times])
<Adjusted with communication waiting time [CF-07]>
Time
Inverter
External control
equipment
②
①
③
Communication trip time
(When reception is timed-out, the
inverter behaves in accordance with the
communication error selection.)
①
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