Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 156)

156 Publication 1753-UM001C-EN-P - March 2010
Chapter 16 Peer-to-peer Communication Overview
The Token Cycle Time depends on the number of controllers in a
token group and can be read on the HH Status tab of the Control
Panel.
Token Alive Timeout
The current holder of the token must send a token alive message to
the Primary
(1)
controller within this time period or the Primary
assumes the token is bad. If the token alive message is missing, a new
token is created by the Primary.
Primary Timeout
Time, within which the Primary expects a check for liveliness from the
Secondary
(2)
controller. If the liveliness check fails to appear, the
Primary assumes that the present Secondary is disconnected. In this
case, the Primary selects a new Secondary.
Secondary Interval
Time, after which the Secondary checks the Primary for liveliness. The
Secondary Interval is less than the Primary Timeout.
Link Mode (Extern)
Same as Link Mode above, except for the connection is to a controller
in another Token Group.
Response Time (Extern)
Same as Response Timeout above, except for the connection is to a
controller in another token group.
(1) The Primary is the controller that generates and supervises the token.
(2) The Secondary is a controller in the same token group as the Primary. The Secondary supervises the Primary.