- HMI Model: MT802iP
- EasyBuilder Pro Version: latest
In my project I use several bit lamps to show status of various items. I have one in particular which links to a PLC Digital/Binary Output in the BACnet tag-list - displaying different colouring for OFF and ON - quite standard. The output in question controls a pump
When the pump is running, the bit-lamp shows the correct “ON” colour for a period, then changes to the “OFF” colour although the DO (& pump) remain ON.
In due course the pump is switched off, and when it switches on the next time the same pattern occurs. I notice the unwanted bit-lamp change coincides with some other PLC / HMI changes, but I dont understand why the bit-lamp changes when the “bit” does not.
I have multi-checked the tag assignment is correct.
I use the same bit-lamp in several windows and they all show the same result.
How can I resolve this?
Hi @BrianF_NZ,
Can you create a separate project where only the bit lamp and the BACnet tag address are placed on the screen. Then test and see if you can recreate the issue.
If the issue still occurs on the isolated project, please check your current project to see if the BACnet tag has been addressed to a different object or macro.
If not, please send us an image of your bit lamp setup. Please let us know if you have any other questions. Thank you!
Hello @BrianF_NZ,
Can you please post a picture of this object’s configuration for our reference?
- HMI Model: MT802iP
- EasyBuilder Pro Version: latest
In my project I use several bit lamps to show status of various items. I have one in particular which links to a PLC Digital/Binary Output in the BACnet tag-list - displaying different colouring for OFF and ON - quite standard. The output in question controls a pump
When the DO (& pump) is running, the bit-lamp shows the correct “ON” colour for a while, then changes to the “OFF” colour although the DO (& pump) remain ON.
In due course the pump is switched off, and when it switches on the next time the same pattern occurs. I notice the unwanted bit-lamp change roughly coincides with some other unrelated PLC / HMI status changes, but I dont understand why the bit-lamp changes when the “bit” does not.
I have multi-checked the tag assignment is correct.
I use the same bit-lamp in several windows and they all show the same result.
How can I resolve this?
Here are shots of the bit-lamp configuration screens
Hi @BrianF_NZ,
The bit lamp will just reflect the value polled from the device. If the object’s visual appearance change and does not correlate with the pump status, this may indicate that the pump or BACnet/IP server is updating the data point to early.
Can you please check this data point by using a BACnet/IP testing / monitoring tool like YABE to see if the value also updated too early in that software as well?
As a pragmatic solution (work-around), I defined another variable as a copy of the DO, and if I reference the bit-lamp to the new variable it works properly.
Hi @BrianF_NZ,
Thank you for the update! If you experience any additional issues, please let us know and we will determine if there is a local Weintek partner that can assist you directly and in real time in your time zone.
