Introduction

You can configure EtherNet/IP and Modbus TCP explicit messages for the M580 CPU in the following ways:

  • Connect the CPU to a Control Expert project.

  • Use the DATA_EXCH function block in application logic to transmit EtherNet/IP or Modbus TCP explicit messages.

  • Use a WRITE_VAR or a READ_VAR function block to exchange Modbus TCP explicit messages, for example, service data objects (SDOs).

NOTE: A single Control Expert application can contain more than 16 explicit messaging blocks, but only 16 explicit messaging blocks can be active at the same time.