IDEC FC6A-C16K1CE Communications Manual page 157

Click Communication Mode for Port 1 and select Modbus RTU Master.
5.
The Modbus RTU Master Request Table dialog box is displayed.
Configure the Modbus RTU Master Request Table dialog box items.
6.
For details, see "Modbus RTU Master Communication" on page 6-2.
Download the user program to the FC6A Series MicroSmart.
7.
This concludes configuring the settings to use the Modbus RTU pass-through function.
FC6A S M S A - -O
ERIES ICRO MART LL IN
T C M
NE YPE OMMUNICATION ANUAL
6: M C
ODBUS OMMUNICATION
FC9Y-B1730 6-31