Installation guide

114 Estimating Network Performance
890 USE 100 00
3.24 A Summary of Network Planning
3.24.1 Analyzing Your Needs
Analyze your application’s data communication requirements prior to
laying out your network or writing your programming. Make a simple
chart to guide your planning. Include the following items for each
communication:
Originating Node Network Number Device Description
Node Address Device Type
Receiving Node Network Number Device Description
Node Address Device Type
Communication Purpose Frequency of Enabling
Priority Number of Registers
Sent Under What Conditions Response Time Needed
3.24.2 Finding Opportunities for Increasing Performance
As you enter your needs on your planning chart, look for the following
opportunities to improve performance by reducing network loading:
V Carefully examine the purpose of each communication and group of
registers to ensure that the communication and data are needed.
V Try to group multiple communications between two nodes into
fewer transactions.
V Try to reduce the frequency at which reads or writes are enabled.
Remember that the maximum frequency of enabling MSTRs is once
per scan.
V Look for receiving controller nodes that have more than four
potential transactions being sent to them—these nodes might have
queueing. Especially look for types of communications that have
high priority, and which are to be sent to nodes that might have
queueing.
V Use peer-to-peer passing of data where applicable, rather than
master-slave polling.