Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario descargar pdf (Pagina 84)

84 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 5 Predict System Performance

While you can use the EtherNet/IP node count to select a CompactLogix 5370

controller for your network requirements, most applications use three sets of

calculations to determine performance:

• Identify and Count Connections

• Calculate Packets/Second

• Estimate Maximum Input or Output Times for CIP Connections

ControlLogix Controller Example

This example control system includes these connections:

• The 1756-L73 controller in the local chassis producing one tag that the

1756-L73 controller in the remote chassis consumes

The produced/consumed tags between the local and remote 1756-L73

controllers use an RPI = 20 ms

• One rack-optimized connection between the local controller and the

remote digital I/O modules at an RPI = 20 ms

• One direct connection to each remote analog I/O module at an

RPI = 50 ms.

Figure 8 - Example ControlLogix System over an EtherNet/IP Network

You also can use the EtherNet/IP Capacity Tool described on page 69 to make

performance predictions.

IMPORTANT

Each 1756-EN2T communication module in the example control system is

series A, firmware revision 2.003.

For 1756 communication modules, series level and firmware revision

determine the maximum packet rate capacity. For more information, see

Table 13 on page 67

Local ControlLogix Chassis

Remote ControlLogix Chassis

1756-L73 1756-EN2T

1756-L73 1756-EN2T 2 Analog I/O

Modules

3 Digital I/O

Modules

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 105 106

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 84