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Trend log capacity of TAC Xenta programmable devices

Trend log capacity of TAC Xenta programmable devices

Issue

TAC Xenta programmable controllers (28X, 30X, 401) can have trend logs stored in memory on the controller.  Each programmable device has a different amount of storage space allocated to trends.

Product Line

Field Devices

Environment

Xenta programmable controllers (280, 281, 282, 283, 300, 301, 302, 401, 401:B)

Cause

The settings of a Xenta trend log (how often a point is read, how much data is stored) need to be made with the memory capacity in mind.

Resolution

This information can be found on the following data sheets :  Xenta 280, Xenta 300, Xenta 401.

Each of the programmables can hold up to 50 trend log definitions.  But the frequency of the polling and length of storage for the trends need to be altered.  The limitation in memory is how many data points can be stored, and is dependent also upon the data type.

Trend Logging in the TAC Xenta 280

Total logging capacity approx. 650 floating point numbers
  or approx. 1,300 integers
  or approx. 10,000 digital values

 

Trend Logging in the TAC Xenta 300 (HW2 or higher)

Total logging capacity approx. 4,000 floating point numbers
  or approx. 8,000 integers
  or approx. 60,000 digital values

 

Trend Logging in the TAC Xenta 401

Total logging capacity approx. 7,000 floating point numbers
  or approx. 15,000 integers
  or approx. 110,000 digital values
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