Intermittent locking of one channel of AI110

[Prachi]

We are continuously monitoring two channels on AI110 and communicating with FP1600 using CVI. But sometimes, one channel gets locked, i.e. it does not get updated while the other channel is updated as per specified time interval. The application is running continuously and there are no other applications which might disturb the communication with FP. Also, the communication seems okay as the other channel is updated and read properly. The problem so far is always with the one and same channel. We tried then to close the CVI application and then read the channels with FieldPoint Explorer. In the first run, the channel again appears locked. It shows some reading in the past when it got locked and doesn't get updated while t
he other channel can be read continuously. Then if we close the FP Explorer and run it again, all works well. The problematic channel works fine once again. There is apparantly no situation that can cause this problem, so we can't reproduce it. Please advise.

[Aaron_G]

The FP-1600 module only transmits data when the data changes outside the configured deadband range for a channel. The default deadband of 0% means that if one reading is different by 1 bit from the previous reading it gets transmitted. However, if the previous reading was identical to the current reading, the data is not transmitted. What it sounds like is happening to you, is that the data on one channel is only slowly changing, and may not be changing enough for the configured deadband setting. A 1% deadband on the 0 - 10.4 Volt range, means that only changes greater than 0.104 Volts are transmitted. To view your deadband settings, open FieldPoint Explorer, right click on the FP-AI-110 in the left pane and choose Edit This Device, then click on the Channel
Configuration button.

Regards,
Aaron