Using the Ethernet Port

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

 

In a supervisory architecture, several intelligent processing devices share system

Networks

data with each other. Many kinds of devices may be part of the network. You should

 

be aware of each device’s requirement for access to the network and of the impact

 

each device will have on the timing of your network communication.

Combined

 

If your system requires both supervisory and I/O handling architectures, one

Supervisory and

solution is to use the I/OBus capabilities of the 171 CCC 960 20 Processor Adapter

I/O Handling

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

 

A maximum of 96 devices may be communicating with the Processor Adapter via

Communication

the Ethernet at any one time. This 96-device limit consists of:

 

λ up to 2 programming panels (one must be in monitor mode)

 

λ up to 14 general purpose Modbus server paths

 

λ up to 16 MSTR elements which support Modbus read, write or read/write

 

commands

 

λ up to 64 cyclic configured data slave paths

 

 

 

Continued on next page

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Schneider Electric Processor Adapter manual Networks, Supervisory, Combined, Handling, Concurrent