Supported Devices

• MelsecQ via TCP/IP

  The MELSECQ driver communicates to a Melsec Q PLC through Ethernet interface modules QJ71E71-100, QJ71E71 and QJ71E71-B2.

  The Ethernet module is an interface on the PLC side for connecting the Q series PLC with the host system, such as a personal computer and a work station where Plant SCADA is installed, and between PLCs using the TCP/IP or UDP/IP communication protocol via Ethernet (100BASE-TX, 10BASE-T, 10BASE5, 10BASE2).

• MelsecQnA via TCP/IP

  The MELSECQ driver communicates to a Melsec QnA PLC through Ethernet interface modules AJ71QE71-B5, A1SJ71QE71-B2 and A1SJ71QE71-B5.

  The Melsec-QnA driver can connect with up to 8 TCP/IP channels per AJ71QE71 interface module. One channel (port) is used to communicate with a primary Melsec-QnA PLC; the other ports can then be used for setting up extra Ethernet communication links to remote I/O modules.

  The primary Melsec QnA PLC can also communicate with other PLC CPUs via a MELSECNET network (MELSECNET/10, MELSECNET/II or MELSECNET/B) connected to the primary PLC. The limit of 8 channels per Ethernet AJ71QE71 is set by the number of fixed buffers on this module. The driver itself has an upper limit of 32 communication channels; this driver setting can be changed if necessary.

• Melsec iQ-R PLC

Note: The same Ethernet card that is being used for Plant SCADA communication can be used for PLC communication, though this may lower performance.

The maximum request length for the MELSECQ protocol is 2048 bits (256 bytes).