Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 14)

Puiblication 1784-6.2.4 - September 1997
1-6 Overview of the KTCX Card Environment
Operating States The KTCX card has five operating states: reset, off-line, lonely,
listen-only and on-line.
Reset
The card is on the network and waiting for start-up procedure to be
placed on-line.
Off-Line
The initial state of the KTCX card at start-up must be off-line. In the
off-line mode, the KTCX card is not on the ControlNet network and
can neither send nor receive messages nor build the node table.
To properly close the host application and shut down the host, you
must take the KTCX card off line. For a detailed explanation, see the
section in Chapter 2 “Taking the KTCX Card Off-Line.”
Lonely
This node is the only active node on the network.
Listen-Only
The node is on the network and listening for network parameters from
the keeper node to bring it on-line.
On-Line
The KTCX card is on the network, available to other nodes and able
to send and receive messages. The host application must select the
KTCX card and specify the node address to place it on-line.
The KT alive flag's value transitions depend on the state of the card.
The states and transitions are defined by the following table:
KTCX States and Transitions
State Description
0 KT emulation has not been initiated or the card is off-line.
Writing to the flag will not change the value.
4 Communications are being initiated. The card has detected the
start-up string and will now transition to state 3.
3 The card has gone into listen-only mode and is now waiting for
the keeper node to bring it on-line. This byte will continue to
rewrite itself every 10ms.
2 The card is now on-line and is ready for PCCC (Programmable
Controller Communication Commands) messaging. This byte
will continue to rewrite itself every 10ms.