
Configuring a Modbus Plus Network in Modsoft with Peer Cop
870USE10110 July 2004 235
Devices on a Sample Modbus Plus Supervisory Network with Components
(Using Modsoft)
Introduction This section describes the three CPUs which exchange data over the sample
Modbus Plus network and the strategy used to assign node addresses.
Devices The three CPUs and their functions are described in the following table:
Address
Strategy
In this type of architecture, assign the lowest network address (1) to the supervisory
computer. When the network initializes, the supervisor will be the first device to get
the token, and the token rotation table will be built with respect to the supervising
device.
MB+ Address CPU Function
1 Pentium supervisory computer with
an AT984 host-based PLC card
Receives specific input data and
sends global outputs
2 171 CCS 760 00 Momentum M1
processor adapter with 172 PNN 210
22 Modbus Plus option adapter
Controls I/OBus network and
exchanges data with AT984
supervisor
3 171 CCS 760 00 Momentum M1
processor adapter with 172 PNN 210
22 Modbus Plus option adapter
Controls I/OBus network and
exchanges data with AT984
supervisor
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