B-63434EN/02 DESCRIPTION 2.CYCLIC TRANSMISSION
- 25 -
2.3 Node State Monitoring
2.3.1 Allocation of local node state
The state of the local node can be monitored by allocating the 6-byte
state code of the local node in the PMC R area.
If a negative value is set in Pa20 (local node information address),
local node information is not posted.
Procedure
Set the following parameter beforehand:
1) Pa20: Local node information address
Local node information is allocated in the PMC R area as follows:
<, )&#()'-#
< (%@-#
< AA+(#"+-#
< =++?#(=
Local node state:
5! ,
<,
:-+?';
Table 2-1 Local Node State
Item Description
Token monitoring time
error flag
Set when transmission does not
terminate within the token monitoring
time (Pa15) set for the local node.
Initialization error flag Set when an initialization parameter or
a parameter set again is invalid.
Reception wait state
flag
Set when the node enters the frame
reception wait state without receiving
any frame during network initialization.
Duplicate node number
flag
Set when a node having the same node
number as for the local node is detected
in the network.