User guide

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Connection to a PLC
External Device Setup Manual
2.4.6 MELSEC-FX Series
2.4.7 MELSEC-Q/QnA: in case using Ethernet Unit setting
1. MICRO/I settings - Project Settings dialog box
This Host I/F driver does not support MELSECNET/H and MELSECNET/10 network.
Item Setting
Interface RS232C, RS422
Data Bits Use the same settings as
for the MICRO/I.
7 (fixed)
Baud Rate 9600 bps (fixed)
Parity Even (fixed)
Stop Bits 1 (fixed)
- When using CPU Direct for the connection, the PLC program scan time will increase when it starts communicating with
the MICRO/I. Investigate this under your actual operating conditions.
- To connect MELSEC-FX series PLC and MICRO/I, check the following two things.
Unchecked the communication setting by the programming software.
Data Register 8120 (D8120) must be 0.
- If the PLC is MELSEC-FX3U or MELSEC-3UC, check the following two thins too.
If MICRO/I connects to CH1 on the PLC, Data Register 8400 (D8400) must be 0.
If MICRO/I connects to CH2 on the PLC, Data Register 8420 (D8420) must be 0.
Item Setting
Communication Interface tab IP Address Set the IP address of MICRO/I.
Subnet mask Set the subnet mask of MICRO/I.
Default Gateway Set the default gateway of MICRO/I.
Host I/F Network tab IP Address Set the IP address of PLC.
Port Number Set the port number of PLC to communicate with MICRO/I.