This section describes where and how messages are defined in the application.

The user defines I/O message transactions in the Peer Cop table of the controller. Entries to the table are made using panel software, such as Schneider's Concept or Modsoft software.

The Peer Cop table specifies the controller registers that are to be used for the I/O data storage. It also specifies the Communication Adapter node addresses which will handle that data.

I/O data messages can also be transacted using Modbus Plus MSTR function blocks in the controller's application program.

Principle: The address defined for each adapter in the Peer Cop table and in MSTR blocks must be identical to the address switch settings on the front panel of the adapter.

Mapping of data between the controller's data registers and the field terminals of I/O bases is unique to each model of I/O base. Mapping is described in the Momentum I/O Bases User Manual, part number 870 USE 002 00.