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Chapter 4
(2) Required settings
The following table lists the inverter settings required for the RS485 communication:
Item
Communication speed
selection
Node allocation
Communication data length
selection *)
Communication parity
selection
Communication stop bit
selection
Selection of operation after
communication error
Communication trip limit time
setting
Communication wait time
Communication mode selection
*) In case Modbus-RTU mode is activated in communication mode selection(C079), internal setting of communication
data length selection become 8bit automatically.
(3) Communication test mode
・ Use the communication test mode to check the hardware of the RS485 communication train.
・ As for this function, communication mode selection (C079) is effective only at the time of ASCII mode (00).
(Procedure for communication test)
1) Remove all cables from the TM2 terminal block to perform a loopback test.
2) Make the following setting with the digital operator of the inverter:
- Specify "02" (loopback test) for the communication speed selection (C071).
3) Turn the inverter power off once, and then turn it back on, whereupon the communication test begins.
4) After the test is completed, the inverter displays one of the following:
- When the communication is normal:
- When the communication train is abnormal:
5) Press the STOP/RESET key of the digital operator or the reset button on the copy unit to switch to the normal
setting screen. Using the setting screen, change the setting made in step 2) to that desired.
Function code
Data or range of data
C071
C072
1. to 247.
C073
C074
C075
C076
C077
0.00 to 99.99 (s)
C078
0. to 1000. (ms)
C079
4-115
Explanation of Functions
02
Loopback test
03
2,400 bps
04
4,800 bps
05
9,600 bps
06
19,200 bps
07
38,400 bps
08
57,600 bps
09
76,800 bps
10
115,200 bps
Assignment of a station number to the
inverter
(Set this item when your inverter is
connected together with other(s) to a
control system.)
7
7 bits
8
8 bits
00
No parity
01
Even parity
02
Odd parity
1
1 bit
2
2 bits
00
Tripping
Tripping after decelerating and stopping the
01
motor
02
Ignoring the errors
03
Stopping the motor after free-running
04
Decelerating and stopping the motor
Limit length of time to determine
communication train disconnection
Time to wait until the inverter returns a
response
00
ASCII mode
01
Modbus-RTU mode
Description
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