system.opc.getServers() returns different results Perspective v.s. Vision

Ignition Early Access
,
1

I am puzzled that system.opc.getServers() in Ignition 8.0.6 Stable (b2019111216) returns different results when executed from a button in Perspective versus Vision. In perspective it does not return disabled OPC server connections. Maybe I am missing something.

# Perspective button example
headers = ["OPCServer", "ServerState"]
data = []
servers = system.opc.getServers()
if not servers:
    print "No servers found"
    data.append(['No servers found', 'unknown'])
else:
    for server in servers:
        data.append([server, system.opc.getServerState(server)])
self.getSibling("OPCServerTable").props.data = system.dataset.toDataSet(headers, data)	



# Vision button example
headers = ["OPCServer", "ServerState"]
data = []
servers = system.opc.getServers()
if not servers:
	print "No servers found"
	data.append(['No servers found'])
else:
	for server in servers:
		print server
		data.append([server, system.opc.getServerState(server)])
print data
event.source.parent.getComponent('Table').data = system.dataset.toDataSet(headers, data)

2019-12-12_9-32-07
2019-12-12_9-32-07719×256 16.6 KB

Thanks!

2

Huh, yep, gateway vs client scope has different implementations (perspective is gateway scope).

3

The good news is this is a known bug. The bad news is that it’s on a pretty low priority backlog. I added this thread, which may help kick it to a higher priority tier.

4

I’m gonna bump this, as I just ran into this on 8.0.9. I have a script that checks for disabled servers and re-enables them. As you can imagine, that doesn’t work.

I worked around it by specifically naming them, but it goes against my sense of lazy. :slight_smile:

5

Well, the bad news is that the ticket suggests getServers shouldn’t return disabled servers in any scope, so…

6

If that is so, then some of the usefulness of system.opc for server information gets crippled. :man_shrugging:

1 Like
7

Maybe we can make it take a keyword arg parameter includeDisabled that defaults to false if not specified.

This would keep all the existing function calls working (though not how you wish), but there’d be a new parameter to let you get disabled servers as well.

1 Like
8

This was implemented and released in 8.0.14.

1 Like
9

Any chance to make it work on 7.9.17 ? we are not yet ready to move to v8 and we would like to use it our project as soon as possible

10

Never mind. I manage to find a solution to skip the problem. Instead of getting the list of servers by calling the system.opc.getServers() I just use this piece of code:

tags = system.tag.browseTagsSimple("[System]Gateway/OPC/Connections","ASC")
OPCServers=[]
for tag in tags:
	if tag.isFolder():
		OPCServers.append(tag.name)