From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
How to read write tags from multiple PLCs with sdsc
PaulNI
Member
09-30-2011 07:01 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Hi,
I know how to read / write to tags of a single PLC. I need to read from and write to multiple PLCs which are in different equipment. Each may have twenty or more tags. Each PLC has a different IP address on the LAN. Can any one guide me on how to do so? Some PLCs are Allen Bradley Micrologix 1400 with addresses like N7:0, N10:3, O:0/4 etc and some are Mitsubishi or ABB. Thanks in advance.
Regds
Paul
krishnaprasad19
Member
10-03-2011 03:41 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Hi Paul,
Here are a few links which might be helpful:
http://zone.ni.com/devzone/cda/tut/p/id/7450
http://zone.ni.com/devzone/cda/tut/p/id/5407
Please let us know if you need anything more.
Have a wonderful day.
Krishna Prasad
10-03-2011 05:50 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Thanks KrishnaPrasad.
I have some peculiar or naive questions. Such questions seem to arise as I continue to work with NI OPC.
1. At times I need to add new instruments ( and hence new ip address and different tags) to the OPC server. I can write an XML file with the new tags added to the earlier ones of other instruments. Now I have to shut down the server and restart it to load the additional tags also into the OPC server. Do I need to shut down all my dotnet controls, groups, disconnect from OPC server, etc., quit the dotnet application and then restart or.... can I restart the OPC server without shutting down the dotnet application?
1a. Will the dotnet application hang as it recieves no data / response from the OPC server. Any example code that handles this situation?
2. If the communication between the PLC and the PC running the OPC server and dot net application and MS SQL server (all on same PC) is cut due to someone turning off the switch/router/hub and then restored say 30 minutes later (when noticed by somebody), will the OPC server hang (since it recieves no response to its polls?
My dot net application needs to store the acquired data for additional statistical calculations that are not available by default in NI.
3. How do I change the captions on the standard NI Menu bar (also add/remove items on that bar and the drop down menus) fit my custom requirements? The run time creation of mouse click pop ups does not interest me.
Regds
Paul NI
