A rising edge at the input Tr will cause the analogue value at AI to be stored to the output AQ.
Further pulses at input Tr will update the output AQ each time.
If the input R is activated then the output is reset to zero.
You could use the analogue memory blocks to monitor trends. For instance, every 10 minutes the temperature value is saved, which can then be compared to the current value. This way you could work out if the temperature is rising, falling or stable.