Figure 135: Device Monitor Object.
SNVT_state_64 nvoNodeMonAlarm[2]
Shows the state of the monitored nodes. Each bit corresponds to one node in the node list
(e.g. bit0 -> index 1, bit1 -> index 2, etc.). Array element nvoNodeMonAlarm[0] represents
nodes with index 1- 64, while array element nvoNodeMonAlarm[1] represents nodes with
index 65-128. If the bit is 0 the corresponding node is reachable and online or was not yet
queried, if the bit is 1 the corresponding node is not reachable or not in configured online
state.
SNVT_count nvoRingALastNode
SNVT_count nvoRingBLastNode
These two network variables allow detecting the point of fracture if the loop is interrupted
by showing the two nodes closest to the fracture. nvoRingALastNode contains the index of
the last node reachable from loop port 1, while nvoRingBLastNode contains the index of the
last node reachable from loop port 2. The value is encoded as follows:
0: All nodes are reachable from this port (loop closed).
1-128: Loop interrupted. Value corresponds to index of last node reachable from this
port.
0xFFFF: Loop interrupted directly at loop port 1 (nvoRingALastNode) or loop port 2
(nvoRingBLastNode) respectively.
Note: Only valid if bus loop monitoring is enabled and the node list order corresponds to the
order of the nodes within the loop (node closest to loop port 1 has index 1, node closest to
loop port 2 has highest index). Otherwise the network variable is set to 0.
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