Carel PlantWatch User Manual

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Cod. Carel. +030221221 – rel. 1.0 dated 20/02/01
17
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The digital variables are always saved by “forced variation”, that is, if in the previous sampling period “0” was saved, and during
the sampling period the value “1” was acquired at least once, then “1” will be saved, irrespective of the value that the variable
had at the end of the period, and vice-versa.
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Any number of variables can be saved, within the following limits:
Total maximum number of variables saved 100
Maximum number of digital variables 64
Maximum number of “slow” analogue variables 64
Maximum number of “fast” analogue variables 64
If 64 slow analogue variables are used, 36 digital variables and no fast analogue variables can be used.
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PlantWatch, in the standard configuration as described in the following table, can record data for a total of 19 days.
Type N
o .
of variables Sampling interval
LF Low Freq. Analogue 32 10 minutes
HF High Freq. Analogue 4 5 minutes
D digital 64 30 seconds
When PlantWatch is configured with a number of variables or a sampling time other than the values described in the table, the
maximum recording time varies from the expected 19 days. It will increase as the number of variables decreases or the sampling
interval increases, and will decrease in the opposite cases.
All the variables belonging to a group are sampled at the same instant, and thus also share the same maximum recording time.
The sampling intervals for the 3 groups can be set using the 3ODQW:DWFK0DQDJHU program or alternatively from the PlantWatch
menu.
The following table shows the recording times achieved according to the variables used:
Number of
variables
Type Interval Minimum time
(days)
32 LF low frequency analogue 10 min 19.5
A 1 HF high frequency analogue 600 sec 113
64 D digital 20 sec 13.5
32 LF low frequency analogue 10 min 19.5
B 4 HF high frequency analogue 300 sec 14
64 D digital 30 sec 20.2
The minimum time refers to the group. The calculation that PlantWatch performs internally to indicate the free space is based on
the group with the minimum duration.
In the example shown in the table, in case $ the recording time used for the calculation corresponds to the digital group, that is,
13.5 days, in case % it corresponds to the high frequency analogue group, that is, 20.2 days.

Carel PlantWatch Specifications

General

Brand	Carel
Model	PlantWatch
Category	Control Unit
Language	English