Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 253)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
11-5
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Refresh Timeout - Enter a value in the range 0 to 10000ms. This value sets
the time that the controller will wait for its turn in the cycle to send its output
data. The setting is used by both masters and slaves.
The Refresh Timeout should be set to the Slave Transmit Timeout
(below) x the number of peers that will be lost on a worst-case network
break.
The Slave Transmit Timeout should trip before the Refresh Timeout if
the network is broken. This will minimise the loss of data transfer.
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Slave Transmit Timeout - Enter a value in the range 1 to 10000ms. This
value sets the time a network master controller will wait for a slave to
complete transmission of its data and return control of the network before
declaring the slave absent. This parameter will be ignored during slave mode.
The Peer-to-Peer network operates in a cycle. Each controller in turn is asked
to send all its configured output data. The Slave Transmit Timeout is only
used by the master of a network. It acts as a watchdog for a lost slave, and it
has to allow time for the slave to send all its outputs even if the slave is itself
waiting for lost packets for its Response Timeout setting. Therefore the
Slave Transmit Timeout should be set to:
(The slave's Response Timeout) x (The maximum number of
output data boards in any controller) + 16ms
If the Response Timeout is 0ms, use 2ms in the calculation above. A
minimum Slave Transmit Timeout of 64ms is recommended.
5) Wire Enable Controller and Master/Slave to variables you have set up for this
purpose.
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Enable Controller - This variable starts or stops the peer communications
using this controller, it should be set it to TRUE to enable the controller.
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Master/Slave - This is a Boolean value that selects the controller's role, it
should be set it to TRUE to make the controller act as a Master or FALSE to
act as a Slave.