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 |
