Followed the device setup, connected, created address registers, data is "bad". Although it appears it recognizes the register as valid.
Use "1" not "40001" for the address.
Following, cause I could never get them to work at my site. lol.
I have followed the tag setup and still get this. Its odd, I can see the tag values in quick client, and can actually change the PLC tag from the ignition screen I made. But tag is not working correctly acccording to this.
Do you have gaps in the Modbus addresses assigned to tags? If so, you will need to turn off the Ignition Driver's "span gaps" setting.
After going through everything several times I still do not get quality data from source back to Ignition. I can write a value out to the modbus, but it does not read properly. Nothing I change has fixed this.
This is to a Micro850 Allen Bradley PLC.
See quality message in image.
Show your driver settings for the
M850 device. Including the advanced settings.
Have you tried including a node address? Like
[M850]1.HR1 ? Ignition's driver uses node zero if not given.
The strange thing is being able to write and change the variables in the 850. So I know it works one way.
Turn "Span Gaps" OFF, as I recommended above.
Tried earlier with no luck, will try again.
I have started over using a different method which works. But I still think the original method "Should" have worked.
I created Modbus registers in the global tags table of the Micro850. Arrays 1-50 of coils and registers. In the user program I then map needed data from the source to these registers. In Ignition I read these register arrays instead of the source coil/int. Bi directional operation works. So I basically created a buffer for the data in the Micro. Nothing more.
Note that native access to ML8xx global tags (with some restrictions) is now available. Avoid the labor of setting up modbus on your tags: