Momentum Sales & Marketing Modbus Plus 170 PNT Series - Manual (Page 32)

Communication Adapter Message Handling
32 870 USE 103 00 May 2001
How Messages Are Defined in the Application
Overview This section describes where and how messages are defined in the application.
Peer Cop Table 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.
MSTR Blocks I/O data messages can also be transacted using Modbus Plus MSTR function
blocks in the controller’s application program.
Addresses Must
Match 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 Data to
I/O Bases 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.