Got a new project going where I have one PVPlus talking to several Micrologix 1100s. I would like to put something on the screen that pops up when the screen loses communication with a given PLC. I realize this is already a feature of sorts on the PVPlus, but the messages can be kind of cryptic for an operator and I would like to show something that normal people could understand. I haven't really done anything like this before, so I don't really know where to start. Appreciate the help.
Monitoring Communications - PV+ to ML1100
- Thread starter brstilson
- Start date
Ken Roach
Lifetime Supporting Member + Moderator
RSLinx Enterprise has a pre-defined Item for each Shortcut called "@IsPresent" that is true when the PanelView is communicating with the controller. It only indicates basic communications connectivity; there's a separate @Mode item to determine Run/Prog/Fault mode.
You can use that as an Alarm trigger, or you could use it to animate the visibility of a picture or text object.
Because Value = 0 cannot be an Alarm trigger value, use an Expression as the Alarm trigger, with the NOT operator. I have the exact syntax if you need it.
You can use that as an Alarm trigger, or you could use it to animate the visibility of a picture or text object.
Because Value = 0 cannot be an Alarm trigger value, use an Expression as the Alarm trigger, with the NOT operator. I have the exact syntax if you need it.
Mickey
Lifetime Supporting Member
Operators and PLC programmers don't fall into that group.
I don't see @IsPresent in the list under the Diagnostics Folder. Is it one of those things that exists but can't be seen? I do see @Mode.
Just saw this in the KB:
Since the Micrologix is technically not in the Logix family (despite the name), is there an equivalent I can use?
EDIT: I also noticed there is an @Communications item I can select, but it is not listed in the RSLinx Enterprise help file.
Since the Micrologix is technically not in the Logix family (despite the name), is there an equivalent I can use?
EDIT: I also noticed there is an @Communications item I can select, but it is not listed in the RSLinx Enterprise help file.
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Ken Roach
Lifetime Supporting Member + Moderator
Try the @IsPresent item anyhow and see if it works. It's been buggy, historically, and the Knowledgebase is full of references to it.
I do have a MicroLogix 1400 handy so I can test with FTView 6.10, at least on my development PC.
I do have a MicroLogix 1400 handy so I can test with FTView 6.10, at least on my development PC.
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Okay, I'll give it a try when I get the hardware. Thanks!
Phrog30
Member
Another option is to use a multistate indicator pointing to a PLC address, doesn't really matter what address. For example, create multistate looking at S:1/15. On the states, have 0 and 1 both state "PLC Comms OK" with a green background. On the error state use something like "NO PLC Comms" with a red background and blinking. Now whenever you use lose a connection this mutlistate will error out and will display whatever you set it up for. Hope I explained this without confusion.
James
James
Kind of obvious now that I think of it!Similar Topics
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