lostcontrol
Lifetime Supporting Member
We have a 1756-L55 system, with 2x Devicenet scanners, 1 with 50+ nodes, the other with < 10 nodes.
90% of the time, this system functions ok, but on the reasonably regular occassion some of the nodes drop off the network, either by power failures or other issues.
To assist in debugging this issue in the future, we have thought about adding 'node status' indication to the HMI. What I am not sure of is how to retrieve this information from the scanner.
The scanner itself as a 124 element DINT array configured for Input/Output status monitoring/control.
There is a combination of node types, predominatly being 1791D-16BO modules, with some valve banks as well.
What is the best way to get the status of each node on the network, so that it can be displayed?
It looks like each module has 2x elements allocated, but I am not sure if any bits of the elements provide any status information or not?
Easy option would be to add in an 'always on' input to each node, but I am not sure what is available on each node. Reading the status seems like the better optoin.
90% of the time, this system functions ok, but on the reasonably regular occassion some of the nodes drop off the network, either by power failures or other issues.
To assist in debugging this issue in the future, we have thought about adding 'node status' indication to the HMI. What I am not sure of is how to retrieve this information from the scanner.
The scanner itself as a 124 element DINT array configured for Input/Output status monitoring/control.
There is a combination of node types, predominatly being 1791D-16BO modules, with some valve banks as well.
What is the best way to get the status of each node on the network, so that it can be displayed?
It looks like each module has 2x elements allocated, but I am not sure if any bits of the elements provide any status information or not?
Easy option would be to add in an 'always on' input to each node, but I am not sure what is available on each node. Reading the status seems like the better optoin.