Using the Ethernet Port
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Network Design Considerations, Continued
I/O Networks In an Ethernet I/O network architecture, an M1 Processor Adapter is used to control
Momentum I/O points equipped with an Ethernet Communication Adapter or other
Modbus over TCP/IP Ethernet-aware devices. Communication between these
devices should be isolated not only from MIS data traffic, but also from unrelated
communication between other control devices.
You may isolate communication by creating a separate network or by using
switches.
Supervisory
Networks In a supervisory architecture, several intelligent proc essing devices share system
data with each other. Many kinds of devices may be part of the ne twork. You should
be aware of each device’s requirement for access to the network and of th e im p act
each device will have on the timing of your network communication.
Combined
Supervisory and
I/O Handling
If your system requires both supervisory and I/O handling architectures, one
solution is to use the I/OBus capabilities of the 171 CCC 960 20 Processor Adapter
for the I/O network and the Ethernet capabilities for the supervisory network.
If you intend to use Ethernet to handle both functions, use switches to isolate the
network traffic and supply additional buffering of network packets.
Concurrent
Communication A maximum of 96 devices may be communicating with the P rocessor Adapter via
the Ethernet at any one time. This 96-device limit consists of:
lup to 2 programming panels (one must be in monitor mode)
lup to 14 general purpose Modbus server paths
lup to 16 MSTR elements which support Modbus read, write or read/write
commands
lup to 64 cyclic configured data slave paths
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