Applies To:
  • CitectSCADA 4.x, 5.x
Summary:
I have set up communication with a Mitsubishi PLC to run the MelsecNet protocol with Citect's MelsecNet driver. As far as I can see everything is setup correctly, but Citect doesn't get the IODevice online. 

Solution:
1) Make sure that the Ethernet card in the PLC is a AJ71E71.

2) Can you ping the IODevice from the PC, if not, check the setup of the TCP/IP protocol in the PC. Note! The PLC requires PLC code to respond to a ping, see point 5.

3) Check the PLC dip switches on the AJ71E71:

SW1: OFF
SW2: OFF (binary communication)
SW3: not used
SW4: not used
SW5: not used
SW6: not used
SW7: ON
SW8: OFF

4) Address field in the IODevice form is set to the correct CPU number, most common is to use 255. Verify this in section 8.1.2 of Melsec A AJ71E71 user manual.

5) The PLC must be programmed to operate the AJ71E71 interface. Sample programs are available on the FTP-site: http://www.citect.com/driverweb. Remember to replace the TCP/IP addresses with your addresses.
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