Publication 1769-UM009B-EN-P - May 2002
Configuring the DeviceNet Network 4-15
Advanced Module Settings
Clicking on the Advanced button opens the following screen:
Expected Packet Rate (EPR)
When the scanner opens a polled or strobed I/O connection, it sets a
maximum timeout (Expected Packet Rate) with the device. If the
device does not receive a packet from the scanner within 4 times the
EPR value, the slave device drops the connection. If the scanner does
not receive a packet from the slave within 4 times the EPR value, it
drops the connection and periodically attempts to open a new
connection.
When a connection is dropped, status bits in the scanner identify that
the slave is not online. Slave behavior when a connection is dropped
is a function of the slave device. If the slave is an I/O device, the
outputs will be cleared, held at last state, or set to a fault condition
(refer to the slave device’s documentation for actual I/O behavior
when a connection is dropped).
The EPR default value is 75 milliseconds.
IMPORTANT
Changing the EPR number should be done carefully
because it effects how long it takes the scanner to
detect a missing device.
Allen-Bradley Drives
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