Improving FieldPoint Sampling Speed

[Synap]

I am using the FieldPoint thorough the cFP-2020 ethernet module connection. I want to monitor a temperature through the cFP-TC-120 module, but the temperature updates are very slow, with refresh times happening from 1-3 seconds. Is there any way to get fast, continuous-like data from the probes, into the module, through the ethernet connection, and into LabView?
Or are TC modules just slow?
Or are FP modules in general slow in aquiring data?

[Aaron_G]

There are two things that will be driving the speed of your application (based upon the information in your post).

First, the [c]FP-TC-120 module has an All Channel Update rate of 1.13 seconds. This means that each channel is updated at a 1.13 second interval. This is the maximum obtainable rate that you will achieve.

Second, FieldPoint ethernet modules (16XX and 20XX series), are designed to transmit data on change only (with an adjustable deadband) to minimize network traffic. Thus if two readings in a row on a channel are the same, the second reading will not be transmitted. In that case, you would see a delta in the timestamp of 2.26 seconds (assuming the third reading was different). To maximize the sampling speed, make sure the deadband on the channel is configured for 0%, this means that any change will be transmitted by the module. If you set a 0.1% deadband, only changes more than 66 bits (65535 * 0.001) would be transmitted. If the temperature range was -270 to 1770 C, this would translate to a change of 2.04 degrees being required before the module would transmit the new value.

FieldPoint modules vary in speeds from several kHz (some of the newest modules) to only a Hz or even slightly less than a Hz. Some modules will vary in speed based upon filter settings (e.g. [c]FP-AI-110).

Regards,
Aaron

[Synap]

Thanks Aaron, that's great info.