Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 15)

Publication 1784-6.2.4 - September 1997
Overview of the KTCX Card Environment 1-7
If the alive flag does not change value, then the KTCX card has been
taken off-line or the card has not been initialized. Figure 1.3 provides
a state diagram for a further description of the states and transitions.
Figure 1.3
Explanation of KTCX Alive States and Transitions
Important: The card will transition from the listen-only or on-line
states to the lonely state whenever the node becomes the only active
node on the network. The card will also transition to listen-only or
on-line when it is in the lonely state if it is joined by another active
node on the network.
Transition Description
A The initialization code (C3,...,0) has been placed in the dual-port and
offset 802h is set to 1.
B KT emulation is placing the card in listen-only mode. The card is now
waiting for the keeper to bring it on-line.
C The KT_alive flag is continually being written with a 3 every 10 ms.
D The card is transitioning to the on-line state and the KT_alive flag is
being set to 2.
E The KT_ alive flag is continually being written with a 2 every 10 ms.
F The card has gone into listen-only due to a network reset command.
G The card has detected a new initialization string and is going back to
its initialization state.
C
D
E
F
G
0 2 3 4
G
A B