Bad quality "tag value" error

[Hari Mistry]

Hi

I am getting the following error message when stating a program
the error is on a ModBus TCP Master controller

Error "ModBus TCP Master bad quality 40034" (40034 is the tag value with the error)

what does this mean bad quality and how can i clear it. only seems to happen when i start with a value already in that location. for example if i have 0 in there I dont get the message but if i have any value above 0 i get the error message.

The only operation I have on that tag is that it is linked to a internal tag.
eg globals.tags.tag1.value = globals.tags.tag2.value

the value seems to pass accross ok and seems to work as normal otherwise.

thank you

[mark.monroe]

Bad quality has to do with the communication between the PLC and the HMI. That error occurs when you have a bad cable or the packets on the line are malformed. You might want to try increasing the Silent time Under Modbus Master Settings.

Snap 2013-02-20 at 08.05.57.jpg (47.74 KiB) Viewed 5648 times