■Cautions during setting
Caution for setting the PU communication check time interval (Pr.122)
During adjustment or when communication with the PLC is not executed
When communication with the PLC is not executed
Set the communication time in the following cases.
• When it is necessary to monitor absence of communication for a certain
time and stop the inverter in such a case while communication with the PLC
is being executed continuously
• When it is necessary to stop the motor at the point when the PLC mode is
changed from RUNSTOP
Parameters (set as needed)
The table below shows parameters to be considered when using various system configurations and inverters.
For the method of use, refer to the respective inverter manual.
Built-in potentiometer switching
Communication EEPROM write
*1 This inverter communication function cannot read or write Pr. 37.
Set Pr.37 to "0" when setting or monitoring the frequency in the PLC.
If any value other than "0" is set and the instruction code HFF is set to "01", the frequency may not be set or monitored normally.
*2 Set Pr.146 to "1" when changing the frequency from the PLC.
Connection destination: PU port, FR-A5NR
Contents of communication setting (essential items)
The table below shows parameters which should be set in all cases.
Communication station number
Stop bit length/data length
Parity check provided/not provided
Waiting time setting
CR/LF provided/not provided
Operation mode selection
Communication startup mode
4 INVERTER COMMUNICATION
4.6 Inverter Communication Settings
0 or 0.01 to
0 or 1
0 or 1
0 to 31
1 or 10
1 to 9998
0: Frequency display, setting
0.01 to 9998: Machine speed at 60 Hz.
0: The built-in frequency setting knob is valid.
1: The built-in frequency setting knob is invalid.
0: Write to EEPROM and RAM
1: Write to RAM only.
Up to 16 inverters can be connected.
Data length: 7 bits
Stop bit: 1 bit
Set in communication data
CR: Provided, LF: Not provided
External operation mode is selected when power is turned ON.
1: Network operation mode
10: Network operation mode (Operation mode can be changed between the
PU operation mode and network operation mode from the operation panel.)