Allen-Bradley Compact I/O 1769-ADN DeviceNet, User Manual

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Publication 1769-UM001B-EN-P - October 2002
1769-ADN Throughput Characteristics C-3
Quick Connect
Performance
The Quick Connect performance depends on:
•
the start-up time of the power supplies in the adapter system.
•
the number of modules in the system.
•
the type of modules in the system.
The typical time for adapter system to go from power applied to ready
to accept an I/O connection request is from 1.4s to 3.0s. Use the
following table as a guide when selecting your power supplies:
Once power is available to the adapter (from the power supply
installed in the first bank of the system), it performs its startup process
(including self-tests, detection of modules installed, and configuration
of each module in the system) before transmitting it’s first Duplicate
MAC ID check message.
Transmission of the first Duplicate MAC ID check message is the end
of the adapter’s startup process and signals to a Quick
Connect-enabled scanner that the adapter is ready to accept an I/O
connection request.
An adapter’s startup process execution time will vary based on the
number of modules installed in the system, and the amount of
configuration data that must be applied to each module. The
minimum time will be approximately 1.0s for a two-discrete module
system. A 30-module system with a mix of 22 discrete and 8 analog
modules took approximately 1.8s to startup.
Adding the power supply startup time with the adapter’s startup
process time estimate will provide an estimate of the adapter system’s
overall Quick Connect startup time.
Catalog Number Typical Startup Time (ms)
1769-PA2 621.00
1769-PB2 497.00
1769-PB4 388.40
1769-PA4 354.00
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